diff --git a/core/modules/comment/tests/src/CommentStatisticsUnitTest.php b/core/modules/comment/tests/src/CommentStatisticsUnitTest.php
index 71d42cd..212e9d8 100644
--- a/core/modules/comment/tests/src/CommentStatisticsUnitTest.php
+++ b/core/modules/comment/tests/src/CommentStatisticsUnitTest.php
@@ -95,8 +95,8 @@ public function setUp() {
    *
    * @see \Drupal\comment\CommentStatistics::read()
    *
-   * @group Drupal
-   * @group Comment
+   * @group drupal
+   * @group comment
    */
   public function testRead() {
     $this->calls_to_fetch = 0;
diff --git a/core/modules/migrate_drupal/src/Tests/dependencies/MigrateDependenciesTest.php b/core/modules/migrate_drupal/src/Tests/dependencies/MigrateDependenciesTest.php
index e5168b0..9d7e815 100644
--- a/core/modules/migrate_drupal/src/Tests/dependencies/MigrateDependenciesTest.php
+++ b/core/modules/migrate_drupal/src/Tests/dependencies/MigrateDependenciesTest.php
@@ -15,7 +15,7 @@
  * Ensure the consistency among the dependencies for migrate.
  *
  * @group migrate_drupal
- * @group Drupal
+ * @group drupal
  * @group migrate_drupal
  */
 class MigrateDependenciesTest extends MigrateDrupalTestBase {
diff --git a/core/modules/system/src/Tests/Action/ActionUnitTest.php b/core/modules/system/src/Tests/Action/ActionUnitTest.php
index 2a5934c..f493ff0 100644
--- a/core/modules/system/src/Tests/Action/ActionUnitTest.php
+++ b/core/modules/system/src/Tests/Action/ActionUnitTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests action plugins.
  *
- * @group Action
+ * @group action
  */
 class ActionUnitTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Ajax/CommandsTest.php b/core/modules/system/src/Tests/Ajax/CommandsTest.php
index 945a763..8ebf06a 100644
--- a/core/modules/system/src/Tests/Ajax/CommandsTest.php
+++ b/core/modules/system/src/Tests/Ajax/CommandsTest.php
@@ -26,7 +26,7 @@
 /**
  * Performs tests on AJAX framework commands.
  *
- * @group Ajax
+ * @group ajax
  */
 class CommandsTest extends AjaxTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Ajax/DialogTest.php b/core/modules/system/src/Tests/Ajax/DialogTest.php
index 127b863..c0bcf2b 100644
--- a/core/modules/system/src/Tests/Ajax/DialogTest.php
+++ b/core/modules/system/src/Tests/Ajax/DialogTest.php
@@ -10,7 +10,7 @@
 /**
  * Performs tests on opening and manipulating dialogs via AJAX commands.
  *
- * @group Ajax
+ * @group ajax
  */
 class DialogTest extends AjaxTestBase {
 
diff --git a/core/modules/system/src/Tests/Ajax/ElementValidationTest.php b/core/modules/system/src/Tests/Ajax/ElementValidationTest.php
index 455ae46..899fa96 100644
--- a/core/modules/system/src/Tests/Ajax/ElementValidationTest.php
+++ b/core/modules/system/src/Tests/Ajax/ElementValidationTest.php
@@ -10,7 +10,7 @@
 /**
  * Various tests of AJAX behavior.
  *
- * @group Ajax
+ * @group ajax
  */
 class ElementValidationTest extends AjaxTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Ajax/FormValuesTest.php b/core/modules/system/src/Tests/Ajax/FormValuesTest.php
index b1c2822..1e957ff 100644
--- a/core/modules/system/src/Tests/Ajax/FormValuesTest.php
+++ b/core/modules/system/src/Tests/Ajax/FormValuesTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that form values are properly delivered to AJAX callbacks.
  *
- * @group Ajax
+ * @group ajax
  */
 class FormValuesTest extends AjaxTestBase {
   function setUp() {
diff --git a/core/modules/system/src/Tests/Ajax/FrameworkTest.php b/core/modules/system/src/Tests/Ajax/FrameworkTest.php
index f31148e..9c9e0e0 100644
--- a/core/modules/system/src/Tests/Ajax/FrameworkTest.php
+++ b/core/modules/system/src/Tests/Ajax/FrameworkTest.php
@@ -17,7 +17,7 @@
 /**
  * Performs tests on AJAX framework functions.
  *
- * @group Ajax
+ * @group ajax
  */
 class FrameworkTest extends AjaxTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Ajax/MultiFormTest.php b/core/modules/system/src/Tests/Ajax/MultiFormTest.php
index bf55e6b..e9d1f65 100644
--- a/core/modules/system/src/Tests/Ajax/MultiFormTest.php
+++ b/core/modules/system/src/Tests/Ajax/MultiFormTest.php
@@ -13,7 +13,7 @@
  * Tests that AJAX-enabled forms work when multiple instances of the same form
  * are on a page.
  *
- * @group Ajax
+ * @group ajax
  */
 class MultiFormTest extends AjaxTestBase {
 
diff --git a/core/modules/system/src/Tests/Batch/PageTest.php b/core/modules/system/src/Tests/Batch/PageTest.php
index 1a30c6c..a61b7dd 100644
--- a/core/modules/system/src/Tests/Batch/PageTest.php
+++ b/core/modules/system/src/Tests/Batch/PageTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the content of the progress page.
  *
- * @group Batch
+ * @group batch
  */
 class PageTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Batch/ProcessingTest.php b/core/modules/system/src/Tests/Batch/ProcessingTest.php
index 837cad0..c70c424 100644
--- a/core/modules/system/src/Tests/Batch/ProcessingTest.php
+++ b/core/modules/system/src/Tests/Batch/ProcessingTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests batch processing in form and non-form workflow.
  *
- * @group Batch
+ * @group batch
  */
 class ProcessingTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Block/SystemMenuBlockTest.php b/core/modules/system/src/Tests/Block/SystemMenuBlockTest.php
index 0d1d00b..45a021f 100644
--- a/core/modules/system/src/Tests/Block/SystemMenuBlockTest.php
+++ b/core/modules/system/src/Tests/Block/SystemMenuBlockTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests \Drupal\system\Plugin\Block\SystemMenuBlock.
  *
- * @group Block
+ * @group block
  * @todo Expand test coverage to all SystemMenuBlock functionality, including
  *   block_menu_delete().
  *
diff --git a/core/modules/system/src/Tests/Bootstrap/GetFilenameUnitTest.php b/core/modules/system/src/Tests/Bootstrap/GetFilenameUnitTest.php
index c499d38..6267fcd 100644
--- a/core/modules/system/src/Tests/Bootstrap/GetFilenameUnitTest.php
+++ b/core/modules/system/src/Tests/Bootstrap/GetFilenameUnitTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that drupal_get_filename() works correctly.
  *
- * @group Bootstrap
+ * @group bootstrap
  */
 class GetFilenameUnitTest extends UnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Bootstrap/PageCacheTest.php b/core/modules/system/src/Tests/Bootstrap/PageCacheTest.php
index b2d4f3d..785cdfa 100644
--- a/core/modules/system/src/Tests/Bootstrap/PageCacheTest.php
+++ b/core/modules/system/src/Tests/Bootstrap/PageCacheTest.php
@@ -15,7 +15,7 @@
 /**
  * Enables the page cache and tests it with various HTTP requests.
  *
- * @group Bootstrap
+ * @group bootstrap
  */
 class PageCacheTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Bootstrap/ResettableStaticUnitTest.php b/core/modules/system/src/Tests/Bootstrap/ResettableStaticUnitTest.php
index 8613902..c11b774 100644
--- a/core/modules/system/src/Tests/Bootstrap/ResettableStaticUnitTest.php
+++ b/core/modules/system/src/Tests/Bootstrap/ResettableStaticUnitTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that drupal_static() and drupal_static_reset() work.
  *
- * @group Bootstrap
+ * @group bootstrap
  */
 class ResettableStaticUnitTest extends UnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Cache/ApcuBackendUnitTest.php b/core/modules/system/src/Tests/Cache/ApcuBackendUnitTest.php
index 134de2c..2b3c7e2 100644
--- a/core/modules/system/src/Tests/Cache/ApcuBackendUnitTest.php
+++ b/core/modules/system/src/Tests/Cache/ApcuBackendUnitTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the APCu cache backend.
  *
- * @group Cache
+ * @group cache
  */
 class ApcuBackendUnitTest extends GenericCacheBackendUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Cache/BackendChainUnitTest.php b/core/modules/system/src/Tests/Cache/BackendChainUnitTest.php
index cbfaf16..0f8ce85 100644
--- a/core/modules/system/src/Tests/Cache/BackendChainUnitTest.php
+++ b/core/modules/system/src/Tests/Cache/BackendChainUnitTest.php
@@ -13,7 +13,7 @@
 /**
  * Unit test of the backend chain using the generic cache unit test base.
  *
- * @group Cache
+ * @group cache
  */
 class BackendChainUnitTest extends GenericCacheBackendUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Cache/ClearTest.php b/core/modules/system/src/Tests/Cache/ClearTest.php
index 740ec8e..6fe2907 100644
--- a/core/modules/system/src/Tests/Cache/ClearTest.php
+++ b/core/modules/system/src/Tests/Cache/ClearTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests our clearing is done the proper way.
  *
- * @group Cache
+ * @group cache
  */
 use Drupal\Core\Cache\Cache;
 
diff --git a/core/modules/system/src/Tests/Cache/DatabaseBackendTagTest.php b/core/modules/system/src/Tests/Cache/DatabaseBackendTagTest.php
index e110d9e..f77e233 100644
--- a/core/modules/system/src/Tests/Cache/DatabaseBackendTagTest.php
+++ b/core/modules/system/src/Tests/Cache/DatabaseBackendTagTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests DatabaseBackend cache tag implementation.
  *
- * @group Cache
+ * @group cache
  */
 class DatabaseBackendTagTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Cache/DatabaseBackendUnitTest.php b/core/modules/system/src/Tests/Cache/DatabaseBackendUnitTest.php
index bd2952e..98f2f0b 100644
--- a/core/modules/system/src/Tests/Cache/DatabaseBackendUnitTest.php
+++ b/core/modules/system/src/Tests/Cache/DatabaseBackendUnitTest.php
@@ -12,7 +12,7 @@
 /**
  * Unit test of the database backend using the generic cache unit test base.
  *
- * @group Cache
+ * @group cache
  */
 class DatabaseBackendUnitTest extends GenericCacheBackendUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Cache/MemoryBackendUnitTest.php b/core/modules/system/src/Tests/Cache/MemoryBackendUnitTest.php
index 85edfde..b003913 100644
--- a/core/modules/system/src/Tests/Cache/MemoryBackendUnitTest.php
+++ b/core/modules/system/src/Tests/Cache/MemoryBackendUnitTest.php
@@ -12,7 +12,7 @@
 /**
  * Unit test of the memory cache backend using the generic cache unit test base.
  *
- * @group Cache
+ * @group cache
  */
 class MemoryBackendUnitTest extends GenericCacheBackendUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php b/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php
index 6dbfb51..cb005ee 100644
--- a/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php
+++ b/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php
@@ -13,7 +13,7 @@
 /**
  * Enables the page cache and tests its cache tags in various scenarios.
  *
- * @group Cache
+ * @group cache
  * @see \Drupal\system\Tests\Bootstrap\PageCacheTest
  * @see \Drupal\node\Tests\NodePageCacheTest
  * @see \Drupal\menu_ui\Tests\MenuTest::testMenuBlockPageCacheTags()
diff --git a/core/modules/system/src/Tests/Cache/PhpBackendUnitTest.php b/core/modules/system/src/Tests/Cache/PhpBackendUnitTest.php
index 57df19b..349483d 100644
--- a/core/modules/system/src/Tests/Cache/PhpBackendUnitTest.php
+++ b/core/modules/system/src/Tests/Cache/PhpBackendUnitTest.php
@@ -12,7 +12,7 @@
 /**
  * Unit test of the PHP cache backend using the generic cache unit test base.
  *
- * @group Cache
+ * @group cache
  */
 class PhpBackendUnitTest extends GenericCacheBackendUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/AddFeedTest.php b/core/modules/system/src/Tests/Common/AddFeedTest.php
index 3dd0c67..54bef0d 100644
--- a/core/modules/system/src/Tests/Common/AddFeedTest.php
+++ b/core/modules/system/src/Tests/Common/AddFeedTest.php
@@ -14,7 +14,7 @@
 /**
  * Make sure that drupal_add_feed() works correctly with various constructs.
  *
- * @group Common
+ * @group common
  */
 class AddFeedTest extends WebTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Common/AlterTest.php b/core/modules/system/src/Tests/Common/AlterTest.php
index d291275..a646759 100644
--- a/core/modules/system/src/Tests/Common/AlterTest.php
+++ b/core/modules/system/src/Tests/Common/AlterTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests alteration of arguments passed to \Drupal::moduleHandler->alter().
  *
- * @group Common
+ * @group common
  */
 class AlterTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/CascadingStylesheetsTest.php b/core/modules/system/src/Tests/Common/CascadingStylesheetsTest.php
index d2b3614..abaf5e9 100644
--- a/core/modules/system/src/Tests/Common/CascadingStylesheetsTest.php
+++ b/core/modules/system/src/Tests/Common/CascadingStylesheetsTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests adding various cascading stylesheets to the page.
  *
- * @group Common
+ * @group common
  */
 class CascadingStylesheetsTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/FormatDateTest.php b/core/modules/system/src/Tests/Common/FormatDateTest.php
index fa5257d..9b0179a 100644
--- a/core/modules/system/src/Tests/Common/FormatDateTest.php
+++ b/core/modules/system/src/Tests/Common/FormatDateTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests the format_date() function.
  *
- * @group Common
+ * @group common
  */
 class FormatDateTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/HtmlIdentifierUnitTest.php b/core/modules/system/src/Tests/Common/HtmlIdentifierUnitTest.php
index c7fbbf9..6d0bc3a 100644
--- a/core/modules/system/src/Tests/Common/HtmlIdentifierUnitTest.php
+++ b/core/modules/system/src/Tests/Common/HtmlIdentifierUnitTest.php
@@ -14,7 +14,7 @@
  * Tests the functions drupal_html_class(), drupal_html_id() and
  * drupal_clean_css_identifier() for expected behavior.
  *
- * @group Common
+ * @group common
  */
 class HtmlIdentifierUnitTest extends UnitTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Common/JavaScriptTest.php b/core/modules/system/src/Tests/Common/JavaScriptTest.php
index 2f5dcae..5313f41 100644
--- a/core/modules/system/src/Tests/Common/JavaScriptTest.php
+++ b/core/modules/system/src/Tests/Common/JavaScriptTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests the JavaScript system.
  *
- * @group Common
+ * @group common
  */
 class JavaScriptTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/MergeAttachmentsTest.php b/core/modules/system/src/Tests/Common/MergeAttachmentsTest.php
index 7eebe32..375979f 100644
--- a/core/modules/system/src/Tests/Common/MergeAttachmentsTest.php
+++ b/core/modules/system/src/Tests/Common/MergeAttachmentsTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the merging of attachments.
  *
- * @group Common
+ * @group common
  */
 class MergeAttachmentsTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/NoJavaScriptAnonymousTest.php b/core/modules/system/src/Tests/Common/NoJavaScriptAnonymousTest.php
index a143f36..16d67e7 100644
--- a/core/modules/system/src/Tests/Common/NoJavaScriptAnonymousTest.php
+++ b/core/modules/system/src/Tests/Common/NoJavaScriptAnonymousTest.php
@@ -13,7 +13,7 @@
  * Tests that anonymous users are not served any JavaScript in the Standard
  * installation profile.
  *
- * @group Common
+ * @group common
  */
 class NoJavaScriptAnonymousTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/RegionContentTest.php b/core/modules/system/src/Tests/Common/RegionContentTest.php
index 6b2d3a4..769f873 100644
--- a/core/modules/system/src/Tests/Common/RegionContentTest.php
+++ b/core/modules/system/src/Tests/Common/RegionContentTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests setting and retrieving content from theme regions.
  *
- * @group Common
+ * @group common
  */
 class RegionContentTest extends WebTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Common/RenderElementTypesTest.php b/core/modules/system/src/Tests/Common/RenderElementTypesTest.php
index 83a9cdf..03e8310 100644
--- a/core/modules/system/src/Tests/Common/RenderElementTypesTest.php
+++ b/core/modules/system/src/Tests/Common/RenderElementTypesTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the markup of core render element types passed to drupal_render().
  *
- * @group Common
+ * @group common
  */
 class RenderElementTypesTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/RenderTest.php b/core/modules/system/src/Tests/Common/RenderTest.php
index e673208..c1694ad 100644
--- a/core/modules/system/src/Tests/Common/RenderTest.php
+++ b/core/modules/system/src/Tests/Common/RenderTest.php
@@ -15,7 +15,7 @@
 /**
  * Performs functional tests on drupal_render().
  *
- * @group Common
+ * @group common
  */
 class RenderTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/RenderWebTest.php b/core/modules/system/src/Tests/Common/RenderWebTest.php
index 13ed788..1a0ea54 100644
--- a/core/modules/system/src/Tests/Common/RenderWebTest.php
+++ b/core/modules/system/src/Tests/Common/RenderWebTest.php
@@ -13,7 +13,7 @@
 /**
  * Performs integration tests on drupal_render().
  *
- * @group Common
+ * @group common
  */
 class RenderWebTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/SimpleTestErrorCollectorTest.php b/core/modules/system/src/Tests/Common/SimpleTestErrorCollectorTest.php
index ae419ff..c6c8472 100644
--- a/core/modules/system/src/Tests/Common/SimpleTestErrorCollectorTest.php
+++ b/core/modules/system/src/Tests/Common/SimpleTestErrorCollectorTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests SimpleTest error and exception collector.
  *
- * @group Common
+ * @group common
  */
 class SimpleTestErrorCollectorTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/SizeUnitTest.php b/core/modules/system/src/Tests/Common/SizeUnitTest.php
index 72e4d3b..04158f2 100644
--- a/core/modules/system/src/Tests/Common/SizeUnitTest.php
+++ b/core/modules/system/src/Tests/Common/SizeUnitTest.php
@@ -14,7 +14,7 @@
  * Parse a predefined amount of bytes and compare the output with the expected
  * value.
  *
- * @group Common
+ * @group common
  */
 class SizeUnitTest extends UnitTestBase {
   protected $exact_test_cases;
diff --git a/core/modules/system/src/Tests/Common/SystemListingTest.php b/core/modules/system/src/Tests/Common/SystemListingTest.php
index fc1cebf..35a8ec8 100644
--- a/core/modules/system/src/Tests/Common/SystemListingTest.php
+++ b/core/modules/system/src/Tests/Common/SystemListingTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests scanning system directories in drupal_system_listing().
  *
- * @group Common
+ * @group common
  */
 class SystemListingTest extends DrupalUnitTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Common/TableSortExtenderUnitTest.php b/core/modules/system/src/Tests/Common/TableSortExtenderUnitTest.php
index 5ad5725..89e4e45 100644
--- a/core/modules/system/src/Tests/Common/TableSortExtenderUnitTest.php
+++ b/core/modules/system/src/Tests/Common/TableSortExtenderUnitTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests table sorting.
  *
- * @group Common
+ * @group common
  */
 class TableSortExtenderUnitTest extends UnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/UrlTest.php b/core/modules/system/src/Tests/Common/UrlTest.php
index 0457146..ac338c8 100644
--- a/core/modules/system/src/Tests/Common/UrlTest.php
+++ b/core/modules/system/src/Tests/Common/UrlTest.php
@@ -21,7 +21,7 @@
  * which may issue a db query, which requires
  * inheriting from a web test case rather than a unit test case.
  *
- * @group Common
+ * @group common
  */
 class UrlTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/WriteRecordTest.php b/core/modules/system/src/Tests/Common/WriteRecordTest.php
index 59d37da..3298bdf 100644
--- a/core/modules/system/src/Tests/Common/WriteRecordTest.php
+++ b/core/modules/system/src/Tests/Common/WriteRecordTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests writing of data records with drupal_write_record().
  *
- * @group Common
+ * @group common
  */
 class WriteRecordTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Common/XssUnitTest.php b/core/modules/system/src/Tests/Common/XssUnitTest.php
index 6f22713..6107f25 100644
--- a/core/modules/system/src/Tests/Common/XssUnitTest.php
+++ b/core/modules/system/src/Tests/Common/XssUnitTest.php
@@ -14,7 +14,7 @@
  * Confirm that \Drupal\Component\Utility\Xss::filter() and check_url() work
  * correctly, including invalid multi-byte sequences.
  *
- * @group Common
+ * @group common
  */
 class XssUnitTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Condition/ConditionFormTest.php b/core/modules/system/src/Tests/Condition/ConditionFormTest.php
index 3bc69f4..ea690e1 100644
--- a/core/modules/system/src/Tests/Condition/ConditionFormTest.php
+++ b/core/modules/system/src/Tests/Condition/ConditionFormTest.php
@@ -16,7 +16,7 @@
  * sure the configuration that was submitted actually causes the condition to
  * validate correctly.
  *
- * @group Condition
+ * @group condition
  */
 class ConditionFormTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Condition/CurrentThemeConditionTest.php b/core/modules/system/src/Tests/Condition/CurrentThemeConditionTest.php
index 26dd6ea..dfe41df 100644
--- a/core/modules/system/src/Tests/Condition/CurrentThemeConditionTest.php
+++ b/core/modules/system/src/Tests/Condition/CurrentThemeConditionTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the CurrentThemeCondition plugin.
  *
- * @group Condition
+ * @group condition
  */
 class CurrentThemeConditionTest extends KernelTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/AlterTest.php b/core/modules/system/src/Tests/Database/AlterTest.php
index 6371b73..dffb73f 100644
--- a/core/modules/system/src/Tests/Database/AlterTest.php
+++ b/core/modules/system/src/Tests/Database/AlterTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the hook_query_alter capabilities of the Select builder.
  *
- * @group Database
+ * @group database
  * @see database_test_query_alter()
  */
 class AlterTest extends DatabaseTestBase {
diff --git a/core/modules/system/src/Tests/Database/BasicSyntaxTest.php b/core/modules/system/src/Tests/Database/BasicSyntaxTest.php
index ca6275c..f51533a 100644
--- a/core/modules/system/src/Tests/Database/BasicSyntaxTest.php
+++ b/core/modules/system/src/Tests/Database/BasicSyntaxTest.php
@@ -14,7 +14,7 @@
  * across multiple kinds of database systems, we test that the
  * database system interprets SQL syntax in an expected fashion.
  *
- * @group Database
+ * @group database
  */
 class BasicSyntaxTest extends DatabaseTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Database/CaseSensitivityTest.php b/core/modules/system/src/Tests/Database/CaseSensitivityTest.php
index 6997073..033ecce 100644
--- a/core/modules/system/src/Tests/Database/CaseSensitivityTest.php
+++ b/core/modules/system/src/Tests/Database/CaseSensitivityTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests handling case sensitive collation.
  *
- * @group Database
+ * @group database
  */
 class CaseSensitivityTest extends DatabaseTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Database/ConnectionTest.php b/core/modules/system/src/Tests/Database/ConnectionTest.php
index 4c93094..a107214 100644
--- a/core/modules/system/src/Tests/Database/ConnectionTest.php
+++ b/core/modules/system/src/Tests/Database/ConnectionTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests of the core database system.
  *
- * @group Database
+ * @group database
  */
 class ConnectionTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/ConnectionUnitTest.php b/core/modules/system/src/Tests/Database/ConnectionUnitTest.php
index a7a053d..30bd50d 100644
--- a/core/modules/system/src/Tests/Database/ConnectionUnitTest.php
+++ b/core/modules/system/src/Tests/Database/ConnectionUnitTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests management of database connections.
  *
- * @group Database
+ * @group database
  */
 class ConnectionUnitTest extends UnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/DatabaseExceptionWrapperTest.php b/core/modules/system/src/Tests/Database/DatabaseExceptionWrapperTest.php
index 34364bb..46e9e8c 100644
--- a/core/modules/system/src/Tests/Database/DatabaseExceptionWrapperTest.php
+++ b/core/modules/system/src/Tests/Database/DatabaseExceptionWrapperTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests exceptions thrown by queries.
  *
- * @group Database
+ * @group database
  */
 class DatabaseExceptionWrapperTest extends UnitTestBase {
   function testDatabaseExceptionWrapper() {
diff --git a/core/modules/system/src/Tests/Database/DeleteTruncateTest.php b/core/modules/system/src/Tests/Database/DeleteTruncateTest.php
index 5c7b977..9b74da5 100755
--- a/core/modules/system/src/Tests/Database/DeleteTruncateTest.php
+++ b/core/modules/system/src/Tests/Database/DeleteTruncateTest.php
@@ -18,7 +18,7 @@
  * TRUNCATE queries is not consistent across database engines. We only test
  * that a TRUNCATE query actually deletes all rows from the target table.
  *
- * @group Database
+ * @group database
  */
 class DeleteTruncateTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/FetchTest.php b/core/modules/system/src/Tests/Database/FetchTest.php
index 30ae0ac..99a81c4 100644
--- a/core/modules/system/src/Tests/Database/FetchTest.php
+++ b/core/modules/system/src/Tests/Database/FetchTest.php
@@ -15,7 +15,7 @@
  *
  * We get timeout errors if we try to run too many tests at once.
  *
- * @group Database
+ * @group database
  */
 class FetchTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/InsertDefaultsTest.php b/core/modules/system/src/Tests/Database/InsertDefaultsTest.php
index d5f60dd..c187f90 100644
--- a/core/modules/system/src/Tests/Database/InsertDefaultsTest.php
+++ b/core/modules/system/src/Tests/Database/InsertDefaultsTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the Insert query builder with default values.
  *
- * @group Database
+ * @group database
  */
 class InsertDefaultsTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/InsertLobTest.php b/core/modules/system/src/Tests/Database/InsertLobTest.php
index 2fcf182..b5d9409 100644
--- a/core/modules/system/src/Tests/Database/InsertLobTest.php
+++ b/core/modules/system/src/Tests/Database/InsertLobTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the Insert query builder with LOB fields.
  *
- * @group Database
+ * @group database
  */
 class InsertLobTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/InsertTest.php b/core/modules/system/src/Tests/Database/InsertTest.php
index 75b24db..f8a6638 100644
--- a/core/modules/system/src/Tests/Database/InsertTest.php
+++ b/core/modules/system/src/Tests/Database/InsertTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the insert builder.
  *
- * @group Database
+ * @group database
  */
 class InsertTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/InvalidDataTest.php b/core/modules/system/src/Tests/Database/InvalidDataTest.php
index cbc7226..2b2ee30 100644
--- a/core/modules/system/src/Tests/Database/InvalidDataTest.php
+++ b/core/modules/system/src/Tests/Database/InvalidDataTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests handling of some invalid data.
  *
- * @group Database
+ * @group database
  */
 class InvalidDataTest extends DatabaseTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Database/LoggingTest.php b/core/modules/system/src/Tests/Database/LoggingTest.php
index c6034ec..8d455ed 100644
--- a/core/modules/system/src/Tests/Database/LoggingTest.php
+++ b/core/modules/system/src/Tests/Database/LoggingTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the query logging facility.
  *
- * @group Database
+ * @group database
  */
 class LoggingTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/MergeTest.php b/core/modules/system/src/Tests/Database/MergeTest.php
index b13c886..9304a52 100644
--- a/core/modules/system/src/Tests/Database/MergeTest.php
+++ b/core/modules/system/src/Tests/Database/MergeTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the MERGE query builder.
  *
- * @group Database
+ * @group database
  */
 class MergeTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/NextIdTest.php b/core/modules/system/src/Tests/Database/NextIdTest.php
index 7a5e83f..0ed100a 100644
--- a/core/modules/system/src/Tests/Database/NextIdTest.php
+++ b/core/modules/system/src/Tests/Database/NextIdTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the sequences API.
  *
- * @group Database
+ * @group database
  */
 class NextIdTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/QueryTest.php b/core/modules/system/src/Tests/Database/QueryTest.php
index ddfd1a5..5bffa30 100644
--- a/core/modules/system/src/Tests/Database/QueryTest.php
+++ b/core/modules/system/src/Tests/Database/QueryTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests Drupal's extended prepared statement syntax..
  *
- * @group Database
+ * @group database
  */
 class QueryTest extends DatabaseTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Database/RangeQueryTest.php b/core/modules/system/src/Tests/Database/RangeQueryTest.php
index c3f9d1d..686a04e 100644
--- a/core/modules/system/src/Tests/Database/RangeQueryTest.php
+++ b/core/modules/system/src/Tests/Database/RangeQueryTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the Range query functionality.
  *
- * @group Database
+ * @group database
  */
 class RangeQueryTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/RegressionTest.php b/core/modules/system/src/Tests/Database/RegressionTest.php
index 0836572..83317ec 100644
--- a/core/modules/system/src/Tests/Database/RegressionTest.php
+++ b/core/modules/system/src/Tests/Database/RegressionTest.php
@@ -10,7 +10,7 @@
 /**
  * Regression tests cases for the database layer.
  *
- * @group Database
+ * @group database
  */
 class RegressionTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/SchemaTest.php b/core/modules/system/src/Tests/Database/SchemaTest.php
index 7673323..a8b9dc9 100644
--- a/core/modules/system/src/Tests/Database/SchemaTest.php
+++ b/core/modules/system/src/Tests/Database/SchemaTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests table creation and modification via the schema API.
  *
- * @group Database
+ * @group database
  */
 class SchemaTest extends UnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/SelectCloneTest.php b/core/modules/system/src/Tests/Database/SelectCloneTest.php
index ad13685..0ab0df8 100644
--- a/core/modules/system/src/Tests/Database/SelectCloneTest.php
+++ b/core/modules/system/src/Tests/Database/SelectCloneTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests cloning Select queries.
  *
- * @group Database
+ * @group database
  */
 class SelectCloneTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/SelectComplexTest.php b/core/modules/system/src/Tests/Database/SelectComplexTest.php
index 13f6589..f3d22c0 100644
--- a/core/modules/system/src/Tests/Database/SelectComplexTest.php
+++ b/core/modules/system/src/Tests/Database/SelectComplexTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the Select query builder with more complex queries.
  *
- * @group Database
+ * @group database
  */
 class SelectComplexTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/SelectOrderedTest.php b/core/modules/system/src/Tests/Database/SelectOrderedTest.php
index 4436ce4..c85534e 100644
--- a/core/modules/system/src/Tests/Database/SelectOrderedTest.php
+++ b/core/modules/system/src/Tests/Database/SelectOrderedTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the Select query builder.
  *
- * @group Database
+ * @group database
  */
 class SelectOrderedTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/SelectPagerDefaultTest.php b/core/modules/system/src/Tests/Database/SelectPagerDefaultTest.php
index 306f1d4..01e4a8e 100644
--- a/core/modules/system/src/Tests/Database/SelectPagerDefaultTest.php
+++ b/core/modules/system/src/Tests/Database/SelectPagerDefaultTest.php
@@ -11,7 +11,7 @@
 /**
  * Tests the pager query select extender.
  *
- * @group Database
+ * @group database
  */
 class SelectPagerDefaultTest extends DatabaseWebTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/SelectSubqueryTest.php b/core/modules/system/src/Tests/Database/SelectSubqueryTest.php
index caa44a7..e9d4ea6 100644
--- a/core/modules/system/src/Tests/Database/SelectSubqueryTest.php
+++ b/core/modules/system/src/Tests/Database/SelectSubqueryTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the Select query builder.
  *
- * @group Database
+ * @group database
  */
 class SelectSubqueryTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/SelectTableSortDefaultTest.php b/core/modules/system/src/Tests/Database/SelectTableSortDefaultTest.php
index 2102667..c6f7a4d 100644
--- a/core/modules/system/src/Tests/Database/SelectTableSortDefaultTest.php
+++ b/core/modules/system/src/Tests/Database/SelectTableSortDefaultTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the tablesort query extender.
  *
- * @group Database
+ * @group database
  */
 class SelectTableSortDefaultTest extends DatabaseWebTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/SelectTest.php b/core/modules/system/src/Tests/Database/SelectTest.php
index 996d269..a1d49a8 100644
--- a/core/modules/system/src/Tests/Database/SelectTest.php
+++ b/core/modules/system/src/Tests/Database/SelectTest.php
@@ -11,7 +11,7 @@
 /**
  * Tests the Select query builder.
  *
- * @group Database
+ * @group database
  */
 class SelectTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/SerializeQueryTest.php b/core/modules/system/src/Tests/Database/SerializeQueryTest.php
index 91e533e..e517655 100644
--- a/core/modules/system/src/Tests/Database/SerializeQueryTest.php
+++ b/core/modules/system/src/Tests/Database/SerializeQueryTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests serializing and unserializing a query.
  *
- * @group Database
+ * @group database
  */
 class SerializeQueryTest extends DatabaseTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Database/TaggingTest.php b/core/modules/system/src/Tests/Database/TaggingTest.php
index 37566fe..53e6ab6 100644
--- a/core/modules/system/src/Tests/Database/TaggingTest.php
+++ b/core/modules/system/src/Tests/Database/TaggingTest.php
@@ -13,7 +13,7 @@
  * Tags are a way to flag queries for alter hooks so they know
  * what type of query it is, such as "node_access".
  *
- * @group Database
+ * @group database
  */
 class TaggingTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/TemporaryQueryTest.php b/core/modules/system/src/Tests/Database/TemporaryQueryTest.php
index a3ac731..0354bc5 100644
--- a/core/modules/system/src/Tests/Database/TemporaryQueryTest.php
+++ b/core/modules/system/src/Tests/Database/TemporaryQueryTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the temporary query functionality.
  *
- * @group Database
+ * @group database
  */
 class TemporaryQueryTest extends DatabaseWebTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/TransactionTest.php b/core/modules/system/src/Tests/Database/TransactionTest.php
index 00ec458..21d732f 100644
--- a/core/modules/system/src/Tests/Database/TransactionTest.php
+++ b/core/modules/system/src/Tests/Database/TransactionTest.php
@@ -30,7 +30,7 @@
  *     Do more stuff
  *     Should still be in transaction A
  *
- * @group Database
+ * @group database
  */
 class TransactionTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/UpdateComplexTest.php b/core/modules/system/src/Tests/Database/UpdateComplexTest.php
index 19eff49..24f8cd8 100644
--- a/core/modules/system/src/Tests/Database/UpdateComplexTest.php
+++ b/core/modules/system/src/Tests/Database/UpdateComplexTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the Update query builder, complex queries.
  *
- * @group Database
+ * @group database
  */
 class UpdateComplexTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/UpdateLobTest.php b/core/modules/system/src/Tests/Database/UpdateLobTest.php
index 7b26fdf..ca5f353 100644
--- a/core/modules/system/src/Tests/Database/UpdateLobTest.php
+++ b/core/modules/system/src/Tests/Database/UpdateLobTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the Update query builder with LOB fields.
  *
- * @group Database
+ * @group database
  */
 class UpdateLobTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Database/UpdateTest.php b/core/modules/system/src/Tests/Database/UpdateTest.php
index d48b706..96486d0 100644
--- a/core/modules/system/src/Tests/Database/UpdateTest.php
+++ b/core/modules/system/src/Tests/Database/UpdateTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the update query builder.
  *
- * @group Database
+ * @group database
  */
 class UpdateTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/src/Tests/Datetime/DrupalDateTimeTest.php b/core/modules/system/src/Tests/Datetime/DrupalDateTimeTest.php
index 36a38e2..f3af80b 100644
--- a/core/modules/system/src/Tests/Datetime/DrupalDateTimeTest.php
+++ b/core/modules/system/src/Tests/Datetime/DrupalDateTimeTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests DrupalDateTime functionality.
  *
- * @group Datetime
+ * @group datetime
  */
 class DrupalDateTimeTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/DrupalKernel/ContentNegotiationTest.php b/core/modules/system/src/Tests/DrupalKernel/ContentNegotiationTest.php
index f45f574..7bae7e9 100644
--- a/core/modules/system/src/Tests/DrupalKernel/ContentNegotiationTest.php
+++ b/core/modules/system/src/Tests/DrupalKernel/ContentNegotiationTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests content negotiation.
  *
- * @group DrupalKernel
+ * @group drupalkernel
  */
 class ContentNegotiationTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/DrupalKernel/DrupalKernelSiteTest.php b/core/modules/system/src/Tests/DrupalKernel/DrupalKernelSiteTest.php
index 7e78d6b..4ef8916 100644
--- a/core/modules/system/src/Tests/DrupalKernel/DrupalKernelSiteTest.php
+++ b/core/modules/system/src/Tests/DrupalKernel/DrupalKernelSiteTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests site-specific service overrides.
  *
- * @group DrupalKernel
+ * @group drupalkernel
  */
 class DrupalKernelSiteTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/DrupalKernel/DrupalKernelTest.php b/core/modules/system/src/Tests/DrupalKernel/DrupalKernelTest.php
index d92ef59..b2cbf4d 100644
--- a/core/modules/system/src/Tests/DrupalKernel/DrupalKernelTest.php
+++ b/core/modules/system/src/Tests/DrupalKernel/DrupalKernelTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests DIC compilation to disk.
  *
- * @group DrupalKernel
+ * @group drupalkernel
  */
 class DrupalKernelTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/DrupalKernel/ServiceDestructionTest.php b/core/modules/system/src/Tests/DrupalKernel/ServiceDestructionTest.php
index 5748447..f589e6f 100644
--- a/core/modules/system/src/Tests/DrupalKernel/ServiceDestructionTest.php
+++ b/core/modules/system/src/Tests/DrupalKernel/ServiceDestructionTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests that services are correctly destructed.
  *
- * @group DrupalKernel
+ * @group drupalkernel
  */
 class ServiceDestructionTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/BundleConstraintValidatorTest.php b/core/modules/system/src/Tests/Entity/BundleConstraintValidatorTest.php
index a8003c4..786e081 100644
--- a/core/modules/system/src/Tests/Entity/BundleConstraintValidatorTest.php
+++ b/core/modules/system/src/Tests/Entity/BundleConstraintValidatorTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests validation constraints for BundleConstraintValidator.
  *
- * @group Entity
+ * @group entity
  */
 class BundleConstraintValidatorTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/ConfigEntityImportTest.php b/core/modules/system/src/Tests/Entity/ConfigEntityImportTest.php
index 85cf0d2..62c5ee5 100644
--- a/core/modules/system/src/Tests/Entity/ConfigEntityImportTest.php
+++ b/core/modules/system/src/Tests/Entity/ConfigEntityImportTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests ConfigEntity importing.
  *
- * @group Entity
+ * @group entity
  */
 class ConfigEntityImportTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/ConfigEntityQueryTest.php b/core/modules/system/src/Tests/Entity/ConfigEntityQueryTest.php
index d29ed00..2f6e0ea 100644
--- a/core/modules/system/src/Tests/Entity/ConfigEntityQueryTest.php
+++ b/core/modules/system/src/Tests/Entity/ConfigEntityQueryTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests Config Entity Query functionality.
  *
- * @group Entity
+ * @group entity
  * @see \Drupal\Core\Config\Entity\Query
  */
 class ConfigEntityQueryTest extends DrupalUnitTestBase {
diff --git a/core/modules/system/src/Tests/Entity/EntityAccessTest.php b/core/modules/system/src/Tests/Entity/EntityAccessTest.php
index 70f402b..6367990 100644
--- a/core/modules/system/src/Tests/Entity/EntityAccessTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityAccessTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests entity access.
  *
- * @group Entity
+ * @group entity
  */
 class EntityAccessTest extends EntityLanguageTestBase  {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityApiInfoTest.php b/core/modules/system/src/Tests/Entity/EntityApiInfoTest.php
index 17f5cbe..e04e1ce 100644
--- a/core/modules/system/src/Tests/Entity/EntityApiInfoTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityApiInfoTest.php
@@ -12,7 +12,7 @@
 /**
  * Makes sure entity info is accurately cached.
  *
- * @group Entity
+ * @group entity
  */
 class EntityApiInfoTest extends WebTestBase  {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityApiTest.php b/core/modules/system/src/Tests/Entity/EntityApiTest.php
index 1f2dfde..d8e9c05 100644
--- a/core/modules/system/src/Tests/Entity/EntityApiTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityApiTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests basic CRUD functionality.
  *
- * @group Entity
+ * @group entity
  */
 class EntityApiTest extends EntityUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityBundleFieldTest.php b/core/modules/system/src/Tests/Entity/EntityBundleFieldTest.php
index 9b51d86..6cfba60 100644
--- a/core/modules/system/src/Tests/Entity/EntityBundleFieldTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityBundleFieldTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests adding a custom bundle field.
  *
- * @group Entity
+ * @group entity
  */
 class EntityBundleFieldTest extends EntityUnitTestBase  {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityCrudHookTest.php b/core/modules/system/src/Tests/Entity/EntityCrudHookTest.php
index 7067f9b..69ea6bf 100644
--- a/core/modules/system/src/Tests/Entity/EntityCrudHookTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityCrudHookTest.php
@@ -25,7 +25,7 @@
  * As well as all type-specific hooks, like hook_node_insert(),
  * hook_comment_update(), etc.
  *
- * @group Entity
+ * @group entity
  */
 class EntityCrudHookTest extends EntityUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityFieldDefaultValueTest.php b/core/modules/system/src/Tests/Entity/EntityFieldDefaultValueTest.php
index 1a0f79f..e99d8b1 100644
--- a/core/modules/system/src/Tests/Entity/EntityFieldDefaultValueTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityFieldDefaultValueTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests default values for entity fields.
  *
- * @group Entity
+ * @group entity
  */
 class EntityFieldDefaultValueTest extends EntityUnitTestBase  {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityFieldTest.php b/core/modules/system/src/Tests/Entity/EntityFieldTest.php
index 5d5b9e4..26dfe8c 100644
--- a/core/modules/system/src/Tests/Entity/EntityFieldTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityFieldTest.php
@@ -23,7 +23,7 @@
 /**
  * Tests the Entity Field API.
  *
- * @group Entity
+ * @group entity
  */
 class EntityFieldTest extends EntityUnitTestBase  {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityFormTest.php b/core/modules/system/src/Tests/Entity/EntityFormTest.php
index fca9c00..1242ddf 100644
--- a/core/modules/system/src/Tests/Entity/EntityFormTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityFormTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the entity form.
  *
- * @group Entity
+ * @group entity
  */
 class EntityFormTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityOperationsTest.php b/core/modules/system/src/Tests/Entity/EntityOperationsTest.php
index 112f80a..857a2bf 100644
--- a/core/modules/system/src/Tests/Entity/EntityOperationsTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityOperationsTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that operations can be injected from the hook.
  *
- * @group Entity
+ * @group entity
  */
 class EntityOperationsTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityQueryAggregateTest.php b/core/modules/system/src/Tests/Entity/EntityQueryAggregateTest.php
index 6875faf..f2c62f3 100644
--- a/core/modules/system/src/Tests/Entity/EntityQueryAggregateTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityQueryAggregateTest.php
@@ -9,7 +9,7 @@
 /**
  * Tests the Entity Query Aggregation API.
  *
- * @group Entity
+ * @group entity
  * @see \Drupal\entity_test\Entity\EntityTest
  */
 class EntityQueryAggregateTest extends EntityUnitTestBase {
diff --git a/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php b/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php
index a945b0d..8c44d70 100644
--- a/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the Entity Query relationship API.
  *
- * @group Entity
+ * @group entity
  */
 class EntityQueryRelationshipTest extends EntityUnitTestBase  {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityQueryTest.php b/core/modules/system/src/Tests/Entity/EntityQueryTest.php
index fbf093a..9e182f5 100644
--- a/core/modules/system/src/Tests/Entity/EntityQueryTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityQueryTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests Entity Query functionality.
  *
- * @group Entity
+ * @group entity
  */
 class EntityQueryTest extends EntityUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityRevisionsTest.php b/core/modules/system/src/Tests/Entity/EntityRevisionsTest.php
index c7f7c5f..73cc217 100644
--- a/core/modules/system/src/Tests/Entity/EntityRevisionsTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityRevisionsTest.php
@@ -13,7 +13,7 @@
  * Create a entity with revisions and test viewing, saving, reverting, and
  * deleting revisions.
  *
- * @group Entity
+ * @group entity
  */
 class EntityRevisionsTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php b/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php
index c2211e3..519bd24 100644
--- a/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests entity translation form.
  *
- * @group Entity
+ * @group entity
  */
 class EntityTranslationFormTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityTranslationTest.php b/core/modules/system/src/Tests/Entity/EntityTranslationTest.php
index 51117b4..7ead22f 100644
--- a/core/modules/system/src/Tests/Entity/EntityTranslationTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityTranslationTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests entity translation functionality.
  *
- * @group Entity
+ * @group entity
  */
 class EntityTranslationTest extends EntityLanguageTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityTypeConstraintValidatorTest.php b/core/modules/system/src/Tests/Entity/EntityTypeConstraintValidatorTest.php
index 1794ead..7a4f3fc 100644
--- a/core/modules/system/src/Tests/Entity/EntityTypeConstraintValidatorTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityTypeConstraintValidatorTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests validation constraints for EntityTypeConstraintValidator.
  *
- * @group Entity
+ * @group entity
  */
 class EntityTypeConstraintValidatorTest extends EntityUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityTypedDataDefinitionTest.php b/core/modules/system/src/Tests/Entity/EntityTypedDataDefinitionTest.php
index 04aaa66..6e7d169 100644
--- a/core/modules/system/src/Tests/Entity/EntityTypedDataDefinitionTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityTypedDataDefinitionTest.php
@@ -20,7 +20,7 @@
 /**
  * Tests deriving metadata of entity and field data types.
  *
- * @group Entity
+ * @group entity
  */
 class EntityTypedDataDefinitionTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityUUIDTest.php b/core/modules/system/src/Tests/Entity/EntityUUIDTest.php
index a5de69a..66f6abf 100644
--- a/core/modules/system/src/Tests/Entity/EntityUUIDTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityUUIDTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests creation, saving, and loading of entity UUIDs.
  *
- * @group Entity
+ * @group entity
  */
 class EntityUUIDTest extends EntityUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityValidationTest.php b/core/modules/system/src/Tests/Entity/EntityValidationTest.php
index eaa3dae..f9eab25 100644
--- a/core/modules/system/src/Tests/Entity/EntityValidationTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityValidationTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the Entity Validation API.
  *
- * @group Entity
+ * @group entity
  */
 class EntityValidationTest extends EntityUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityViewBuilderTest.php b/core/modules/system/src/Tests/Entity/EntityViewBuilderTest.php
index 355edc0..86465f5 100644
--- a/core/modules/system/src/Tests/Entity/EntityViewBuilderTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityViewBuilderTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the entity view builder.
  *
- * @group Entity
+ * @group entity
  */
 class EntityViewBuilderTest extends EntityUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php b/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php
index bc07bd0..35c8a2c 100644
--- a/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests EntityViewController functionality.
  *
- * @group Entity
+ * @group entity
  */
 class EntityViewControllerTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/FieldAccessTest.php b/core/modules/system/src/Tests/Entity/FieldAccessTest.php
index cfbb6c9..2f96641 100644
--- a/core/modules/system/src/Tests/Entity/FieldAccessTest.php
+++ b/core/modules/system/src/Tests/Entity/FieldAccessTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests Field level access hooks.
  *
- * @group Entity
+ * @group entity
  */
 class FieldAccessTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/FieldSqlStorageTest.php b/core/modules/system/src/Tests/Entity/FieldSqlStorageTest.php
index d195237..a3ec834 100644
--- a/core/modules/system/src/Tests/Entity/FieldSqlStorageTest.php
+++ b/core/modules/system/src/Tests/Entity/FieldSqlStorageTest.php
@@ -18,7 +18,7 @@
  * Field_sql_storage.module implements the default back-end storage plugin
  * for the Field Storage API.
  *
- * @group Entity
+ * @group entity
  */
 class FieldSqlStorageTest extends EntityUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Entity/FieldTranslationSqlStorageTest.php b/core/modules/system/src/Tests/Entity/FieldTranslationSqlStorageTest.php
index f506ced..c927d14 100644
--- a/core/modules/system/src/Tests/Entity/FieldTranslationSqlStorageTest.php
+++ b/core/modules/system/src/Tests/Entity/FieldTranslationSqlStorageTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests Field translation SQL Storage.
  *
- * @group Entity
+ * @group entity
  */
 class FieldTranslationSqlStorageTest extends EntityLanguageTestBase {
 
diff --git a/core/modules/system/src/Tests/Extension/InfoParserUnitTest.php b/core/modules/system/src/Tests/Extension/InfoParserUnitTest.php
index 17c441f..94a3db2 100644
--- a/core/modules/system/src/Tests/Extension/InfoParserUnitTest.php
+++ b/core/modules/system/src/Tests/Extension/InfoParserUnitTest.php
@@ -18,7 +18,7 @@
  * with .info.txt instead of info.yml in order not not be considered as real
  * extensions.
  *
- * @group Extension
+ * @group extension
  */
 class InfoParserUnitTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Extension/ModuleHandlerTest.php b/core/modules/system/src/Tests/Extension/ModuleHandlerTest.php
index 8d93c7a..5dda713 100644
--- a/core/modules/system/src/Tests/Extension/ModuleHandlerTest.php
+++ b/core/modules/system/src/Tests/Extension/ModuleHandlerTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests ModuleHandler functionality.
  *
- * @group Extension
+ * @group extension
  */
 class ModuleHandlerTest extends KernelTestBase {
 
diff --git a/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php b/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php
index 03a94cf..f00c098 100644
--- a/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php
+++ b/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests installing/enabling, disabling, and uninstalling of themes.
  *
- * @group Extension
+ * @group extension
  */
 class ThemeHandlerTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/File/ConfigTest.php b/core/modules/system/src/Tests/File/ConfigTest.php
index 6649718..d777079 100644
--- a/core/modules/system/src/Tests/File/ConfigTest.php
+++ b/core/modules/system/src/Tests/File/ConfigTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests file system configuration operations.
  *
- * @group File
+ * @group file
  */
 class ConfigTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/File/DirectoryTest.php b/core/modules/system/src/Tests/File/DirectoryTest.php
index c4ca643..5528b91 100644
--- a/core/modules/system/src/Tests/File/DirectoryTest.php
+++ b/core/modules/system/src/Tests/File/DirectoryTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests operations dealing with directories.
  *
- * @group File
+ * @group file
  */
 class DirectoryTest extends FileTestBase {
   /**
diff --git a/core/modules/system/src/Tests/File/HtaccessUnitTest.php b/core/modules/system/src/Tests/File/HtaccessUnitTest.php
index 4fb7fed..379b346 100644
--- a/core/modules/system/src/Tests/File/HtaccessUnitTest.php
+++ b/core/modules/system/src/Tests/File/HtaccessUnitTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests .htaccess file saving.
  *
- * @group File
+ * @group file
  */
 class HtaccessUnitTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/File/MimeTypeTest.php b/core/modules/system/src/Tests/File/MimeTypeTest.php
index f09b60d..75c6cce 100644
--- a/core/modules/system/src/Tests/File/MimeTypeTest.php
+++ b/core/modules/system/src/Tests/File/MimeTypeTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests filename mimetype detection.
  *
- * @group File
+ * @group file
  */
 class MimeTypeTest extends FileTestBase {
 
diff --git a/core/modules/system/src/Tests/File/NameMungingTest.php b/core/modules/system/src/Tests/File/NameMungingTest.php
index 7dfa878..0664077 100644
--- a/core/modules/system/src/Tests/File/NameMungingTest.php
+++ b/core/modules/system/src/Tests/File/NameMungingTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests filename munging and unmunging.
  *
- * @group File
+ * @group file
  */
 class NameMungingTest extends FileTestBase {
   function setUp() {
diff --git a/core/modules/system/src/Tests/File/ReadOnlyStreamWrapperTest.php b/core/modules/system/src/Tests/File/ReadOnlyStreamWrapperTest.php
index 96747b0..cc15b81 100644
--- a/core/modules/system/src/Tests/File/ReadOnlyStreamWrapperTest.php
+++ b/core/modules/system/src/Tests/File/ReadOnlyStreamWrapperTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the read-only stream wrapper write functions.
  *
- * @group File
+ * @group file
  */
 class ReadOnlyStreamWrapperTest extends FileTestBase {
 
diff --git a/core/modules/system/src/Tests/File/RemoteFileDirectoryTest.php b/core/modules/system/src/Tests/File/RemoteFileDirectoryTest.php
index 8ebe597..e12455a 100644
--- a/core/modules/system/src/Tests/File/RemoteFileDirectoryTest.php
+++ b/core/modules/system/src/Tests/File/RemoteFileDirectoryTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests operations dealing with directories.
  *
- * @group File
+ * @group file
  */
 class RemoteFileDirectoryTest extends DirectoryTest {
 
diff --git a/core/modules/system/src/Tests/File/RemoteFileScanDirectoryTest.php b/core/modules/system/src/Tests/File/RemoteFileScanDirectoryTest.php
index f09e299..ba7c2ae 100644
--- a/core/modules/system/src/Tests/File/RemoteFileScanDirectoryTest.php
+++ b/core/modules/system/src/Tests/File/RemoteFileScanDirectoryTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the file_scan_directory() function.
  *
- * @group File
+ * @group file
  */
 class RemoteFileScanDirectoryTest extends ScanDirectoryTest {
 
diff --git a/core/modules/system/src/Tests/File/RemoteFileUnmanagedCopyTest.php b/core/modules/system/src/Tests/File/RemoteFileUnmanagedCopyTest.php
index 18828a1..aecfdd5 100644
--- a/core/modules/system/src/Tests/File/RemoteFileUnmanagedCopyTest.php
+++ b/core/modules/system/src/Tests/File/RemoteFileUnmanagedCopyTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the unmanaged file copy function.
  *
- * @group File
+ * @group file
  */
 class RemoteFileUnmanagedCopyTest extends UnmanagedCopyTest {
 
diff --git a/core/modules/system/src/Tests/File/RemoteFileUnmanagedDeleteRecursiveTest.php b/core/modules/system/src/Tests/File/RemoteFileUnmanagedDeleteRecursiveTest.php
index cb81a60..8934e74 100644
--- a/core/modules/system/src/Tests/File/RemoteFileUnmanagedDeleteRecursiveTest.php
+++ b/core/modules/system/src/Tests/File/RemoteFileUnmanagedDeleteRecursiveTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the unmanaged file delete recursive function.
  *
- * @group File
+ * @group file
  */
 class RemoteFileUnmanagedDeleteRecursiveTest extends UnmanagedDeleteRecursiveTest {
 
diff --git a/core/modules/system/src/Tests/File/RemoteFileUnmanagedDeleteTest.php b/core/modules/system/src/Tests/File/RemoteFileUnmanagedDeleteTest.php
index 4247cd4..85c1f06 100644
--- a/core/modules/system/src/Tests/File/RemoteFileUnmanagedDeleteTest.php
+++ b/core/modules/system/src/Tests/File/RemoteFileUnmanagedDeleteTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the unmanaged file delete function.
  *
- * @group File
+ * @group file
  */
 class RemoteFileUnmanagedDeleteTest extends UnmanagedDeleteTest {
 
diff --git a/core/modules/system/src/Tests/File/RemoteFileUnmanagedMoveTest.php b/core/modules/system/src/Tests/File/RemoteFileUnmanagedMoveTest.php
index 9714778..7dd40ab 100644
--- a/core/modules/system/src/Tests/File/RemoteFileUnmanagedMoveTest.php
+++ b/core/modules/system/src/Tests/File/RemoteFileUnmanagedMoveTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the unmanaged file move function.
  *
- * @group File
+ * @group file
  */
 class RemoteFileUnmanagedMoveTest extends UnmanagedMoveTest {
 
diff --git a/core/modules/system/src/Tests/File/RemoteFileUnmanagedSaveDataTest.php b/core/modules/system/src/Tests/File/RemoteFileUnmanagedSaveDataTest.php
index 47686ac..90277e3 100644
--- a/core/modules/system/src/Tests/File/RemoteFileUnmanagedSaveDataTest.php
+++ b/core/modules/system/src/Tests/File/RemoteFileUnmanagedSaveDataTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the unmanaged file save data function.
  *
- * @group File
+ * @group file
  */
 class RemoteFileUnmanagedSaveDataTest extends UnmanagedSaveDataTest {
 
diff --git a/core/modules/system/src/Tests/File/ScanDirectoryTest.php b/core/modules/system/src/Tests/File/ScanDirectoryTest.php
index cda57de..49f4cc2 100644
--- a/core/modules/system/src/Tests/File/ScanDirectoryTest.php
+++ b/core/modules/system/src/Tests/File/ScanDirectoryTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the file_scan_directory() function.
  *
- * @group File
+ * @group file
  */
 class ScanDirectoryTest extends FileTestBase {
 
diff --git a/core/modules/system/src/Tests/File/StreamWrapperTest.php b/core/modules/system/src/Tests/File/StreamWrapperTest.php
index 755e988..6014fa9 100644
--- a/core/modules/system/src/Tests/File/StreamWrapperTest.php
+++ b/core/modules/system/src/Tests/File/StreamWrapperTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests stream wrapper functions.
  *
- * @group File
+ * @group file
  */
 class StreamWrapperTest extends FileTestBase {
 
diff --git a/core/modules/system/src/Tests/File/UnmanagedCopyTest.php b/core/modules/system/src/Tests/File/UnmanagedCopyTest.php
index 5a3a4de..8cbec29 100644
--- a/core/modules/system/src/Tests/File/UnmanagedCopyTest.php
+++ b/core/modules/system/src/Tests/File/UnmanagedCopyTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the unmanaged file copy function.
  *
- * @group File
+ * @group file
  */
 class UnmanagedCopyTest extends FileTestBase {
   /**
diff --git a/core/modules/system/src/Tests/File/UnmanagedDeleteRecursiveTest.php b/core/modules/system/src/Tests/File/UnmanagedDeleteRecursiveTest.php
index 892f317..6c78a81 100644
--- a/core/modules/system/src/Tests/File/UnmanagedDeleteRecursiveTest.php
+++ b/core/modules/system/src/Tests/File/UnmanagedDeleteRecursiveTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the unmanaged file delete recursive function.
  *
- * @group File
+ * @group file
  */
 class UnmanagedDeleteRecursiveTest extends FileTestBase {
   /**
diff --git a/core/modules/system/src/Tests/File/UnmanagedDeleteTest.php b/core/modules/system/src/Tests/File/UnmanagedDeleteTest.php
index a3638aa..8876e31 100644
--- a/core/modules/system/src/Tests/File/UnmanagedDeleteTest.php
+++ b/core/modules/system/src/Tests/File/UnmanagedDeleteTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the unmanaged file delete function.
  *
- * @group File
+ * @group file
  */
 class UnmanagedDeleteTest extends FileTestBase {
   /**
diff --git a/core/modules/system/src/Tests/File/UnmanagedMoveTest.php b/core/modules/system/src/Tests/File/UnmanagedMoveTest.php
index 6e79062..32b3a29 100644
--- a/core/modules/system/src/Tests/File/UnmanagedMoveTest.php
+++ b/core/modules/system/src/Tests/File/UnmanagedMoveTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the unmanaged file move function.
  *
- * @group File
+ * @group file
  */
 class UnmanagedMoveTest extends FileTestBase {
   /**
diff --git a/core/modules/system/src/Tests/File/UnmanagedSaveDataTest.php b/core/modules/system/src/Tests/File/UnmanagedSaveDataTest.php
index f3548f2..7df316b 100644
--- a/core/modules/system/src/Tests/File/UnmanagedSaveDataTest.php
+++ b/core/modules/system/src/Tests/File/UnmanagedSaveDataTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the file_unmanaged_save_data() function.
  *
- * @group File
+ * @group file
  */
 class UnmanagedSaveDataTest extends FileTestBase {
   /**
diff --git a/core/modules/system/src/Tests/File/UrlRewritingTest.php b/core/modules/system/src/Tests/File/UrlRewritingTest.php
index 0d8c33f..af54d4f 100644
--- a/core/modules/system/src/Tests/File/UrlRewritingTest.php
+++ b/core/modules/system/src/Tests/File/UrlRewritingTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests for file URL rewriting.
  *
- * @group File
+ * @group file
  */
 class UrlRewritingTest extends FileTestBase {
 
diff --git a/core/modules/system/src/Tests/FileTransfer/FileTransferTest.php b/core/modules/system/src/Tests/FileTransfer/FileTransferTest.php
index 529219d..f538eba 100644
--- a/core/modules/system/src/Tests/FileTransfer/FileTransferTest.php
+++ b/core/modules/system/src/Tests/FileTransfer/FileTransferTest.php
@@ -15,7 +15,7 @@
  * Tests that the jail is respected and that protocols using recursive file move
  * operations work.
  *
- * @group FileTransfer
+ * @group filetransfer
  */
 class FileTransferTest extends WebTestBase {
   protected $hostname = 'localhost';
diff --git a/core/modules/system/src/Tests/Form/AlterTest.php b/core/modules/system/src/Tests/Form/AlterTest.php
index eb9411d..db4eeea 100644
--- a/core/modules/system/src/Tests/Form/AlterTest.php
+++ b/core/modules/system/src/Tests/Form/AlterTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests hook_form_alter() and hook_form_FORM_ID_alter().
  *
- * @group Form
+ * @group form
  */
 class AlterTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/ArbitraryRebuildTest.php b/core/modules/system/src/Tests/Form/ArbitraryRebuildTest.php
index 3da65ff..1d06f44 100644
--- a/core/modules/system/src/Tests/Form/ArbitraryRebuildTest.php
+++ b/core/modules/system/src/Tests/Form/ArbitraryRebuildTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests altering forms to be rebuilt so there are multiple steps.
  *
- * @group Form
+ * @group form
  */
 class ArbitraryRebuildTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/CheckboxTest.php b/core/modules/system/src/Tests/Form/CheckboxTest.php
index 3e0240c..0d2b83b 100644
--- a/core/modules/system/src/Tests/Form/CheckboxTest.php
+++ b/core/modules/system/src/Tests/Form/CheckboxTest.php
@@ -13,7 +13,7 @@
  * Tests form API checkbox handling of various combinations of #default_value
  * and #return_value.
  *
- * @group Form
+ * @group form
  */
 class CheckboxTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/ConfirmFormTest.php b/core/modules/system/src/Tests/Form/ConfirmFormTest.php
index 3ea2820..c6ff2cd 100644
--- a/core/modules/system/src/Tests/Form/ConfirmFormTest.php
+++ b/core/modules/system/src/Tests/Form/ConfirmFormTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests confirmation forms.
  *
- * @group Form
+ * @group form
  */
 class ConfirmFormTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/ElementTest.php b/core/modules/system/src/Tests/Form/ElementTest.php
index f24eb4a..187ad77 100644
--- a/core/modules/system/src/Tests/Form/ElementTest.php
+++ b/core/modules/system/src/Tests/Form/ElementTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests building and processing of core form elements.
  *
- * @group Form
+ * @group form
  */
 class ElementTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/ElementsLabelsTest.php b/core/modules/system/src/Tests/Form/ElementsLabelsTest.php
index 970f299..4cfd484 100644
--- a/core/modules/system/src/Tests/Form/ElementsLabelsTest.php
+++ b/core/modules/system/src/Tests/Form/ElementsLabelsTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests form element labels, required markers and associated output.
  *
- * @group Form
+ * @group form
  */
 class ElementsLabelsTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/ElementsTableSelectTest.php b/core/modules/system/src/Tests/Form/ElementsTableSelectTest.php
index e6bfdda..254de20 100644
--- a/core/modules/system/src/Tests/Form/ElementsTableSelectTest.php
+++ b/core/modules/system/src/Tests/Form/ElementsTableSelectTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the tableselect form element for expected behavior.
  *
- * @group Form
+ * @group form
  */
 class ElementsTableSelectTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/ElementsVerticalTabsTest.php b/core/modules/system/src/Tests/Form/ElementsVerticalTabsTest.php
index fdd4edd..726e559 100644
--- a/core/modules/system/src/Tests/Form/ElementsVerticalTabsTest.php
+++ b/core/modules/system/src/Tests/Form/ElementsVerticalTabsTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the vertical_tabs form element for expected behavior.
  *
- * @group Form
+ * @group form
  */
 class ElementsVerticalTabsTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/EmailTest.php b/core/modules/system/src/Tests/Form/EmailTest.php
index 8e88f50..c331c2e 100644
--- a/core/modules/system/src/Tests/Form/EmailTest.php
+++ b/core/modules/system/src/Tests/Form/EmailTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the form API email element.
  *
- * @group Form
+ * @group form
  */
 class EmailTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/FormCacheTest.php b/core/modules/system/src/Tests/Form/FormCacheTest.php
index 301e5fc..4abdd21 100644
--- a/core/modules/system/src/Tests/Form/FormCacheTest.php
+++ b/core/modules/system/src/Tests/Form/FormCacheTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests form_set_cache() and form_get_cache().
  *
- * @group Form
+ * @group form
  */
 class FormCacheTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/FormObjectTest.php b/core/modules/system/src/Tests/Form/FormObjectTest.php
index 237d9e7..1085729 100644
--- a/core/modules/system/src/Tests/Form/FormObjectTest.php
+++ b/core/modules/system/src/Tests/Form/FormObjectTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests building a form from an object.
  *
- * @group Form
+ * @group form
  */
 class FormObjectTest extends SystemConfigFormTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/FormTest.php b/core/modules/system/src/Tests/Form/FormTest.php
index a380bd7..bbf5fe9 100644
--- a/core/modules/system/src/Tests/Form/FormTest.php
+++ b/core/modules/system/src/Tests/Form/FormTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests various form element validation mechanisms.
  *
- * @group Form
+ * @group form
  */
 class FormTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/LanguageSelectElementTest.php b/core/modules/system/src/Tests/Form/LanguageSelectElementTest.php
index ca7c9af..f0d3581 100644
--- a/core/modules/system/src/Tests/Form/LanguageSelectElementTest.php
+++ b/core/modules/system/src/Tests/Form/LanguageSelectElementTest.php
@@ -16,7 +16,7 @@
  * Tests that the language select form element prints and submits the right
  * options.
  *
- * @group Form
+ * @group form
  */
 class LanguageSelectElementTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/ModulesListFormWebTest.php b/core/modules/system/src/Tests/Form/ModulesListFormWebTest.php
index 56f1d5c..9bca9c6 100644
--- a/core/modules/system/src/Tests/Form/ModulesListFormWebTest.php
+++ b/core/modules/system/src/Tests/Form/ModulesListFormWebTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests \Drupal\system\Form\ModulesListForm.
  *
- * @group Form
+ * @group form
  */
 class ModulesListFormWebTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/ProgrammaticTest.php b/core/modules/system/src/Tests/Form/ProgrammaticTest.php
index 902fe2e..e298595 100644
--- a/core/modules/system/src/Tests/Form/ProgrammaticTest.php
+++ b/core/modules/system/src/Tests/Form/ProgrammaticTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the programmatic form submission behavior.
  *
- * @group Form
+ * @group form
  */
 class ProgrammaticTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/RebuildTest.php b/core/modules/system/src/Tests/Form/RebuildTest.php
index 7cba668..4de535a 100644
--- a/core/modules/system/src/Tests/Form/RebuildTest.php
+++ b/core/modules/system/src/Tests/Form/RebuildTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests functionality of drupal_rebuild_form().
  *
- * @group Form
+ * @group form
  * @todo Add tests for other aspects of form rebuilding.
  */
 class RebuildTest extends WebTestBase {
diff --git a/core/modules/system/src/Tests/Form/RedirectTest.php b/core/modules/system/src/Tests/Form/RedirectTest.php
index 51be0d8..503080c 100644
--- a/core/modules/system/src/Tests/Form/RedirectTest.php
+++ b/core/modules/system/src/Tests/Form/RedirectTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests form redirection functionality.
  *
- * @group Form
+ * @group form
  */
 class RedirectTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/StateValuesCleanAdvancedTest.php b/core/modules/system/src/Tests/Form/StateValuesCleanAdvancedTest.php
index 09df7f6..eda7e49 100644
--- a/core/modules/system/src/Tests/Form/StateValuesCleanAdvancedTest.php
+++ b/core/modules/system/src/Tests/Form/StateValuesCleanAdvancedTest.php
@@ -13,7 +13,7 @@
  * Tests proper removal of submitted form values using form_state_values_clean()
  * when having forms with elements containing buttons like "managed_file".
  *
- * @group Form
+ * @group form
  */
 class StateValuesCleanAdvancedTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/StateValuesCleanTest.php b/core/modules/system/src/Tests/Form/StateValuesCleanTest.php
index 804ffa1..5858027 100644
--- a/core/modules/system/src/Tests/Form/StateValuesCleanTest.php
+++ b/core/modules/system/src/Tests/Form/StateValuesCleanTest.php
@@ -14,7 +14,7 @@
  * Tests proper removal of submitted form values using
  * form_state_values_clean().
  *
- * @group Form
+ * @group form
  */
 class StateValuesCleanTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/StorageTest.php b/core/modules/system/src/Tests/Form/StorageTest.php
index 509cf53..14e6b92 100644
--- a/core/modules/system/src/Tests/Form/StorageTest.php
+++ b/core/modules/system/src/Tests/Form/StorageTest.php
@@ -19,7 +19,7 @@
  * when a validation error occurs, it makes sure that changed form element
  * values aren't lost due to a wrong form rebuild.
  *
- * @group Form
+ * @group form
  */
 class StorageTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/SystemConfigFormTest.php b/core/modules/system/src/Tests/Form/SystemConfigFormTest.php
index 863bb15..75d9445 100644
--- a/core/modules/system/src/Tests/Form/SystemConfigFormTest.php
+++ b/core/modules/system/src/Tests/Form/SystemConfigFormTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the SystemConfigFormTestBase class.
  *
- * @group Form
+ * @group form
  */
 class SystemConfigFormTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/TriggeringElementProgrammedUnitTest.php b/core/modules/system/src/Tests/Form/TriggeringElementProgrammedUnitTest.php
index 3e6f413..cdf35c3 100644
--- a/core/modules/system/src/Tests/Form/TriggeringElementProgrammedUnitTest.php
+++ b/core/modules/system/src/Tests/Form/TriggeringElementProgrammedUnitTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests detection of triggering_element for programmed form submissions.
  *
- * @group Form
+ * @group form
  */
 class TriggeringElementProgrammedUnitTest extends DrupalUnitTestBase implements FormInterface {
 
diff --git a/core/modules/system/src/Tests/Form/TriggeringElementTest.php b/core/modules/system/src/Tests/Form/TriggeringElementTest.php
index 21a2195..27f1b05 100644
--- a/core/modules/system/src/Tests/Form/TriggeringElementTest.php
+++ b/core/modules/system/src/Tests/Form/TriggeringElementTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that FAPI correctly determines $form_state['triggering_element'].
  *
- * @group Form
+ * @group form
  */
 class TriggeringElementTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/UrlTest.php b/core/modules/system/src/Tests/Form/UrlTest.php
index 45f6f94..427a828 100644
--- a/core/modules/system/src/Tests/Form/UrlTest.php
+++ b/core/modules/system/src/Tests/Form/UrlTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the form API URL element.
  *
- * @group Form
+ * @group form
  */
 class UrlTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Form/ValidationTest.php b/core/modules/system/src/Tests/Form/ValidationTest.php
index 7fef3c9..c6897f7 100644
--- a/core/modules/system/src/Tests/Form/ValidationTest.php
+++ b/core/modules/system/src/Tests/Form/ValidationTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests form processing and alteration via form validation handlers.
  *
- * @group Form
+ * @group form
  */
 class ValidationTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Image/ToolkitGdTest.php b/core/modules/system/src/Tests/Image/ToolkitGdTest.php
index 6927ec0..cbcc984 100644
--- a/core/modules/system/src/Tests/Image/ToolkitGdTest.php
+++ b/core/modules/system/src/Tests/Image/ToolkitGdTest.php
@@ -15,7 +15,7 @@
  * Tests that core image manipulations work properly: scale, resize, rotate,
  * crop, scale and crop, and desaturate.
  *
- * @group Image
+ * @group image
  */
 class ToolkitGdTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Image/ToolkitSetupFormTest.php b/core/modules/system/src/Tests/Image/ToolkitSetupFormTest.php
index 22b976d..4d5b766 100644
--- a/core/modules/system/src/Tests/Image/ToolkitSetupFormTest.php
+++ b/core/modules/system/src/Tests/Image/ToolkitSetupFormTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests image toolkit setup form.
  *
- * @group Image
+ * @group image
  */
 class ToolkitSetupFormTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Image/ToolkitTest.php b/core/modules/system/src/Tests/Image/ToolkitTest.php
index 8965a45..69a5c1e 100644
--- a/core/modules/system/src/Tests/Image/ToolkitTest.php
+++ b/core/modules/system/src/Tests/Image/ToolkitTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests image toolkit functions.
  *
- * @group Image
+ * @group image
  */
 class ToolkitTest extends ToolkitTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Installer/DistributionProfileTest.php b/core/modules/system/src/Tests/Installer/DistributionProfileTest.php
index cdae9ec..4e9bdb2 100644
--- a/core/modules/system/src/Tests/Installer/DistributionProfileTest.php
+++ b/core/modules/system/src/Tests/Installer/DistributionProfileTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests distribution profile support.
  *
- * @group Installer
+ * @group installer
  */
 class DistributionProfileTest extends InstallerTestBase {
 
diff --git a/core/modules/system/src/Tests/Installer/InstallerEmptySettingsTest.php b/core/modules/system/src/Tests/Installer/InstallerEmptySettingsTest.php
index 63bb9a8..2ff5ddf 100644
--- a/core/modules/system/src/Tests/Installer/InstallerEmptySettingsTest.php
+++ b/core/modules/system/src/Tests/Installer/InstallerEmptySettingsTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the installer with empty settings file.
  *
- * @group Installer
+ * @group installer
  */
 class InstallerEmptySettingsTest extends InstallerTestBase {
 
diff --git a/core/modules/system/src/Tests/Installer/InstallerExistingDatabaseSettingsTest.php b/core/modules/system/src/Tests/Installer/InstallerExistingDatabaseSettingsTest.php
index c97899c..de04973 100644
--- a/core/modules/system/src/Tests/Installer/InstallerExistingDatabaseSettingsTest.php
+++ b/core/modules/system/src/Tests/Installer/InstallerExistingDatabaseSettingsTest.php
@@ -14,7 +14,7 @@
  * Tests the installer with an existing settings file with database connection
  * info.
  *
- * @group Installer
+ * @group installer
  */
 class InstallerExistingDatabaseSettingsTest extends InstallerTestBase {
 
diff --git a/core/modules/system/src/Tests/Installer/InstallerExistingSettingsTest.php b/core/modules/system/src/Tests/Installer/InstallerExistingSettingsTest.php
index 4645668..023d29e 100644
--- a/core/modules/system/src/Tests/Installer/InstallerExistingSettingsTest.php
+++ b/core/modules/system/src/Tests/Installer/InstallerExistingSettingsTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the installer with an existing settings file.
  *
- * @group Installer
+ * @group installer
  */
 class InstallerExistingSettingsTest extends InstallerTestBase {
 
diff --git a/core/modules/system/src/Tests/Installer/InstallerLanguageDirectionTest.php b/core/modules/system/src/Tests/Installer/InstallerLanguageDirectionTest.php
index 74b8be2..fd8ad0b 100644
--- a/core/modules/system/src/Tests/Installer/InstallerLanguageDirectionTest.php
+++ b/core/modules/system/src/Tests/Installer/InstallerLanguageDirectionTest.php
@@ -12,7 +12,7 @@
 /**
  * Verifies that the early installer uses the correct language direction.
  *
- * @group Installer
+ * @group installer
  */
 class InstallerLanguageDirectionTest extends InstallerTestBase {
 
diff --git a/core/modules/system/src/Tests/Installer/InstallerLanguageTest.php b/core/modules/system/src/Tests/Installer/InstallerLanguageTest.php
index b32ef40..9313d47 100644
--- a/core/modules/system/src/Tests/Installer/InstallerLanguageTest.php
+++ b/core/modules/system/src/Tests/Installer/InstallerLanguageTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests for installer language support.
  *
- * @group Installer
+ * @group installer
  */
 class InstallerLanguageTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Installer/InstallerTest.php b/core/modules/system/src/Tests/Installer/InstallerTest.php
index 760a942..6216a0b 100644
--- a/core/modules/system/src/Tests/Installer/InstallerTest.php
+++ b/core/modules/system/src/Tests/Installer/InstallerTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the interactive installer.
  *
- * @group Installer
+ * @group installer
  */
 class InstallerTest extends InstallerTestBase {
 
diff --git a/core/modules/system/src/Tests/Installer/InstallerTranslationTest.php b/core/modules/system/src/Tests/Installer/InstallerTranslationTest.php
index 8ebf010..fd909bd 100644
--- a/core/modules/system/src/Tests/Installer/InstallerTranslationTest.php
+++ b/core/modules/system/src/Tests/Installer/InstallerTranslationTest.php
@@ -13,7 +13,7 @@
  * Selects German as the installation language and verifies the following page
  * is not in English.
  *
- * @group Installer
+ * @group installer
  */
 class InstallerTranslationTest extends InstallerTestBase {
 
diff --git a/core/modules/system/src/Tests/Installer/InstallerTranslationVersionUnitTest.php b/core/modules/system/src/Tests/Installer/InstallerTranslationVersionUnitTest.php
index 031a79d..8f0f696 100644
--- a/core/modules/system/src/Tests/Installer/InstallerTranslationVersionUnitTest.php
+++ b/core/modules/system/src/Tests/Installer/InstallerTranslationVersionUnitTest.php
@@ -13,7 +13,7 @@
  * Tests the translation version fallback used during site installation to
  * determine available translation files.
  *
- * @group Installer
+ * @group installer
  */
 class InstallerTranslationVersionUnitTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Installer/SiteNameTest.php b/core/modules/system/src/Tests/Installer/SiteNameTest.php
index 983b208..a2c0555 100644
--- a/core/modules/system/src/Tests/Installer/SiteNameTest.php
+++ b/core/modules/system/src/Tests/Installer/SiteNameTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that the site name can be set during a non-interactive installation.
  *
- * @group Installer
+ * @group installer
  */
 class SiteNameTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/KeyValueStore/DatabaseStorageExpirableTest.php b/core/modules/system/src/Tests/KeyValueStore/DatabaseStorageExpirableTest.php
index 115ad3b..524da4b 100644
--- a/core/modules/system/src/Tests/KeyValueStore/DatabaseStorageExpirableTest.php
+++ b/core/modules/system/src/Tests/KeyValueStore/DatabaseStorageExpirableTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the key-value database storage.
  *
- * @group KeyValueStore
+ * @group keyvaluestore
  */
 class DatabaseStorageExpirableTest extends StorageTestBase {
 
diff --git a/core/modules/system/src/Tests/KeyValueStore/DatabaseStorageTest.php b/core/modules/system/src/Tests/KeyValueStore/DatabaseStorageTest.php
index f3f61be..1675fd2 100644
--- a/core/modules/system/src/Tests/KeyValueStore/DatabaseStorageTest.php
+++ b/core/modules/system/src/Tests/KeyValueStore/DatabaseStorageTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the key-value database storage.
  *
- * @group KeyValueStore
+ * @group keyvaluestore
  */
 class DatabaseStorageTest extends StorageTestBase {
 
diff --git a/core/modules/system/src/Tests/KeyValueStore/GarbageCollectionTest.php b/core/modules/system/src/Tests/KeyValueStore/GarbageCollectionTest.php
index 6341f51..ea42a77 100644
--- a/core/modules/system/src/Tests/KeyValueStore/GarbageCollectionTest.php
+++ b/core/modules/system/src/Tests/KeyValueStore/GarbageCollectionTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests garbage collection for the the expirable key-value database storage.
  *
- * @group KeyValueStore
+ * @group keyvaluestore
  */
 class GarbageCollectionTest extends UnitTestBase {
 
diff --git a/core/modules/system/src/Tests/KeyValueStore/KeyValueConfigEntityStorageTest.php b/core/modules/system/src/Tests/KeyValueStore/KeyValueConfigEntityStorageTest.php
index 1fe1ab6..bd5287d 100644
--- a/core/modules/system/src/Tests/KeyValueStore/KeyValueConfigEntityStorageTest.php
+++ b/core/modules/system/src/Tests/KeyValueStore/KeyValueConfigEntityStorageTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests KeyValueEntityStorage for config entities.
  *
- * @group KeyValueStore
+ * @group keyvaluestore
  */
 class KeyValueConfigEntityStorageTest extends ConfigEntityTest {
 
diff --git a/core/modules/system/src/Tests/KeyValueStore/KeyValueContentEntityStorageTest.php b/core/modules/system/src/Tests/KeyValueStore/KeyValueContentEntityStorageTest.php
index 9dd9b22..75a7879 100644
--- a/core/modules/system/src/Tests/KeyValueStore/KeyValueContentEntityStorageTest.php
+++ b/core/modules/system/src/Tests/KeyValueStore/KeyValueContentEntityStorageTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests KeyValueEntityStorage for content entities.
  *
- * @group KeyValueStore
+ * @group keyvaluestore
  */
 class KeyValueContentEntityStorageTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/KeyValueStore/MemoryStorageTest.php b/core/modules/system/src/Tests/KeyValueStore/MemoryStorageTest.php
index 10b2a15..3c737bd 100644
--- a/core/modules/system/src/Tests/KeyValueStore/MemoryStorageTest.php
+++ b/core/modules/system/src/Tests/KeyValueStore/MemoryStorageTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the key-value memory storage.
  *
- * @group KeyValueStore
+ * @group keyvaluestore
  */
 class MemoryStorageTest extends StorageTestBase {
 
diff --git a/core/modules/system/src/Tests/Lock/LockFunctionalTest.php b/core/modules/system/src/Tests/Lock/LockFunctionalTest.php
index 6b1518c..7970273 100644
--- a/core/modules/system/src/Tests/Lock/LockFunctionalTest.php
+++ b/core/modules/system/src/Tests/Lock/LockFunctionalTest.php
@@ -12,7 +12,7 @@
 /**
  * Confirm locking works between two separate requests.
  *
- * @group Lock
+ * @group lock
  */
 class LockFunctionalTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Lock/LockUnitTest.php b/core/modules/system/src/Tests/Lock/LockUnitTest.php
index 9d489a6..79448fa 100644
--- a/core/modules/system/src/Tests/Lock/LockUnitTest.php
+++ b/core/modules/system/src/Tests/Lock/LockUnitTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the Database lock backend.
  *
- * @group Lock
+ * @group lock
  */
 class LockUnitTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Mail/HtmlToTextTest.php b/core/modules/system/src/Tests/Mail/HtmlToTextTest.php
index e48ba42..8f850d3 100644
--- a/core/modules/system/src/Tests/Mail/HtmlToTextTest.php
+++ b/core/modules/system/src/Tests/Mail/HtmlToTextTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests for drupal_html_to_text().
  *
- * @group Mail
+ * @group mail
  */
 class HtmlToTextTest extends WebTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Mail/MailTest.php b/core/modules/system/src/Tests/Mail/MailTest.php
index a4dcf5f..1629f1c 100644
--- a/core/modules/system/src/Tests/Mail/MailTest.php
+++ b/core/modules/system/src/Tests/Mail/MailTest.php
@@ -12,7 +12,7 @@
 /**
  * Performs tests on the pluggable mailing framework.
  *
- * @group Mail
+ * @group mail
  */
 class MailTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Mail/WrapMailUnitTest.php b/core/modules/system/src/Tests/Mail/WrapMailUnitTest.php
index e9a6619..c7e2717 100644
--- a/core/modules/system/src/Tests/Mail/WrapMailUnitTest.php
+++ b/core/modules/system/src/Tests/Mail/WrapMailUnitTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests drupal_wrap_mail().
  *
- * @group Mail
+ * @group mail
  */
 class WrapMailUnitTest extends UnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Menu/BreadcrumbTest.php b/core/modules/system/src/Tests/Menu/BreadcrumbTest.php
index f1bf640..bf3dea3 100644
--- a/core/modules/system/src/Tests/Menu/BreadcrumbTest.php
+++ b/core/modules/system/src/Tests/Menu/BreadcrumbTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests breadcrumbs functionality.
  *
- * @group Menu
+ * @group menu
  */
 class BreadcrumbTest extends MenuTestBase {
 
diff --git a/core/modules/system/src/Tests/Menu/LinksTest.php b/core/modules/system/src/Tests/Menu/LinksTest.php
index eecfb8c..71ec6b4 100644
--- a/core/modules/system/src/Tests/Menu/LinksTest.php
+++ b/core/modules/system/src/Tests/Menu/LinksTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests handling of menu links hierarchies.
  *
- * @group Menu
+ * @group menu
  */
 class LinksTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Menu/LocalActionTest.php b/core/modules/system/src/Tests/Menu/LocalActionTest.php
index bcc443b..01ce35b 100644
--- a/core/modules/system/src/Tests/Menu/LocalActionTest.php
+++ b/core/modules/system/src/Tests/Menu/LocalActionTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests local actions derived from router and added/altered via hooks.
  *
- * @group Menu
+ * @group menu
  */
 class LocalActionTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Menu/LocalTasksTest.php b/core/modules/system/src/Tests/Menu/LocalTasksTest.php
index 957e2eb..fe38b88 100644
--- a/core/modules/system/src/Tests/Menu/LocalTasksTest.php
+++ b/core/modules/system/src/Tests/Menu/LocalTasksTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests local tasks derived from router and added/altered via hooks.
  *
- * @group Menu
+ * @group menu
  */
 class LocalTasksTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Menu/MenuRouterRebuildTest.php b/core/modules/system/src/Tests/Menu/MenuRouterRebuildTest.php
index e56796f..84cb7e1 100644
--- a/core/modules/system/src/Tests/Menu/MenuRouterRebuildTest.php
+++ b/core/modules/system/src/Tests/Menu/MenuRouterRebuildTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests menu_router_rebuild().
  *
- * @group Menu
+ * @group menu
  */
 class MenuRouterRebuildTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Menu/MenuRouterTest.php b/core/modules/system/src/Tests/Menu/MenuRouterTest.php
index cc64d4b..737f42b 100644
--- a/core/modules/system/src/Tests/Menu/MenuRouterTest.php
+++ b/core/modules/system/src/Tests/Menu/MenuRouterTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests menu router and default menu link functionality.
  *
- * @group Menu
+ * @group menu
  */
 class MenuRouterTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Menu/MenuTranslateTest.php b/core/modules/system/src/Tests/Menu/MenuTranslateTest.php
index 99e1401..01dc3cb 100644
--- a/core/modules/system/src/Tests/Menu/MenuTranslateTest.php
+++ b/core/modules/system/src/Tests/Menu/MenuTranslateTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the _menu_translate() method.
  *
- * @group Menu
+ * @group menu
  * @see _menu_translate().
  */
 class MenuTranslateTest extends WebTestBase {
diff --git a/core/modules/system/src/Tests/Module/ClassLoaderTest.php b/core/modules/system/src/Tests/Module/ClassLoaderTest.php
index fcfb205..cce73df 100644
--- a/core/modules/system/src/Tests/Module/ClassLoaderTest.php
+++ b/core/modules/system/src/Tests/Module/ClassLoaderTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests class loading for modules.
  *
- * @group Module
+ * @group module
  */
 class ClassLoaderTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Module/DependencyTest.php b/core/modules/system/src/Tests/Module/DependencyTest.php
index 6ef1fb9..ab38cec 100644
--- a/core/modules/system/src/Tests/Module/DependencyTest.php
+++ b/core/modules/system/src/Tests/Module/DependencyTest.php
@@ -10,7 +10,7 @@
 /**
  * Enable module without dependency enabled.
  *
- * @group Module
+ * @group module
  */
 class DependencyTest extends ModuleTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Module/HookRequirementsTest.php b/core/modules/system/src/Tests/Module/HookRequirementsTest.php
index dd286e9..9893491 100644
--- a/core/modules/system/src/Tests/Module/HookRequirementsTest.php
+++ b/core/modules/system/src/Tests/Module/HookRequirementsTest.php
@@ -10,7 +10,7 @@
 /**
  * Attempts enabling a module that fails hook_requirements('install').
  *
- * @group Module
+ * @group module
  */
 class HookRequirementsTest extends ModuleTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Module/InstallTest.php b/core/modules/system/src/Tests/Module/InstallTest.php
index 476f25d..2d4027b 100644
--- a/core/modules/system/src/Tests/Module/InstallTest.php
+++ b/core/modules/system/src/Tests/Module/InstallTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the installation of modules.
  *
- * @group Module
+ * @group module
  */
 class InstallTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Module/InstallUninstallTest.php b/core/modules/system/src/Tests/Module/InstallUninstallTest.php
index c826d1c..34b81f1 100644
--- a/core/modules/system/src/Tests/Module/InstallUninstallTest.php
+++ b/core/modules/system/src/Tests/Module/InstallUninstallTest.php
@@ -10,7 +10,7 @@
 /**
  * Install/uninstall core module and confirm table creation/deletion.
  *
- * @group Module
+ * @group module
  */
 class InstallUninstallTest extends ModuleTestBase {
 
diff --git a/core/modules/system/src/Tests/Module/RequiredTest.php b/core/modules/system/src/Tests/Module/RequiredTest.php
index c14d293..5fc22e8 100644
--- a/core/modules/system/src/Tests/Module/RequiredTest.php
+++ b/core/modules/system/src/Tests/Module/RequiredTest.php
@@ -10,7 +10,7 @@
 /**
  * Attempt disabling of required modules.
  *
- * @group Module
+ * @group module
  */
 class RequiredTest extends ModuleTestBase {
   /**
diff --git a/core/modules/system/src/Tests/Module/UninstallTest.php b/core/modules/system/src/Tests/Module/UninstallTest.php
index 39bfa79..efe0f7d 100644
--- a/core/modules/system/src/Tests/Module/UninstallTest.php
+++ b/core/modules/system/src/Tests/Module/UninstallTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the uninstallation of modules.
  *
- * @group Module
+ * @group module
  */
 class UninstallTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Module/VersionTest.php b/core/modules/system/src/Tests/Module/VersionTest.php
index 2d6705a..6ec527e 100644
--- a/core/modules/system/src/Tests/Module/VersionTest.php
+++ b/core/modules/system/src/Tests/Module/VersionTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests module version dependencies.
  *
- * @group Module
+ * @group module
  */
 class VersionTest extends ModuleTestBase {
 
diff --git a/core/modules/system/src/Tests/Page/DefaultMetatagsTest.php b/core/modules/system/src/Tests/Page/DefaultMetatagsTest.php
index 00e09e3..6c53057 100644
--- a/core/modules/system/src/Tests/Page/DefaultMetatagsTest.php
+++ b/core/modules/system/src/Tests/Page/DefaultMetatagsTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests default HTML metatags on a page.
  *
- * @group Page
+ * @group page
  */
 class DefaultMetatagsTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Pager/PagerTest.php b/core/modules/system/src/Tests/Pager/PagerTest.php
index 1f3fe4d..03741d0 100644
--- a/core/modules/system/src/Tests/Pager/PagerTest.php
+++ b/core/modules/system/src/Tests/Pager/PagerTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests pager functionality.
  *
- * @group Pager
+ * @group pager
  */
 class PagerTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php b/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php
index a9f8335..8409965 100644
--- a/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php
+++ b/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests upcasting of url arguments to entities.
  *
- * @group ParamConverter
+ * @group paramconverter
  */
 class UpcastingTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Path/AliasTest.php b/core/modules/system/src/Tests/Path/AliasTest.php
index 5727d52..d20da08 100644
--- a/core/modules/system/src/Tests/Path/AliasTest.php
+++ b/core/modules/system/src/Tests/Path/AliasTest.php
@@ -16,7 +16,7 @@
 /**
  * Tests path alias CRUD and lookup functionality.
  *
- * @group Path
+ * @group path
  */
 class AliasTest extends PathUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Path/UrlAlterFunctionalTest.php b/core/modules/system/src/Tests/Path/UrlAlterFunctionalTest.php
index 92ab50f..16627d8 100644
--- a/core/modules/system/src/Tests/Path/UrlAlterFunctionalTest.php
+++ b/core/modules/system/src/Tests/Path/UrlAlterFunctionalTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests altering the inbound path and the outbound path.
  *
- * @group Path
+ * @group path
  */
 class UrlAlterFunctionalTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/PhpStorage/PhpStorageFactoryTest.php b/core/modules/system/src/Tests/PhpStorage/PhpStorageFactoryTest.php
index 166f3ff..0dacf29 100644
--- a/core/modules/system/src/Tests/PhpStorage/PhpStorageFactoryTest.php
+++ b/core/modules/system/src/Tests/PhpStorage/PhpStorageFactoryTest.php
@@ -17,7 +17,7 @@
 /**
  * Tests the PHP storage factory.
  *
- * @group PhpStorage
+ * @group phpstorage
  * @see \Drupal\Core\PhpStorage\PhpStorageFactory
  */
 class PhpStorageFactoryTest extends DrupalUnitTestBase {
diff --git a/core/modules/system/src/Tests/Plugin/AlterDecoratorTest.php b/core/modules/system/src/Tests/Plugin/AlterDecoratorTest.php
index b6946f3..fcb104b 100644
--- a/core/modules/system/src/Tests/Plugin/AlterDecoratorTest.php
+++ b/core/modules/system/src/Tests/Plugin/AlterDecoratorTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests that the AlterDecorator fires and respects the alter hook.
  *
- * @group Plugin
+ * @group plugin
  */
 class AlterDecoratorTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Plugin/CacheDecoratorLanguageTest.php b/core/modules/system/src/Tests/Plugin/CacheDecoratorLanguageTest.php
index 6be2b6f..6e74f07 100644
--- a/core/modules/system/src/Tests/Plugin/CacheDecoratorLanguageTest.php
+++ b/core/modules/system/src/Tests/Plugin/CacheDecoratorLanguageTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests that the CacheDecorator stores definitions by language appropriately.
  *
- * @group Plugin
+ * @group plugin
  */
 class CacheDecoratorLanguageTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Plugin/CacheDecoratorTest.php b/core/modules/system/src/Tests/Plugin/CacheDecoratorTest.php
index 99f2d81..b9eb0fd 100644
--- a/core/modules/system/src/Tests/Plugin/CacheDecoratorTest.php
+++ b/core/modules/system/src/Tests/Plugin/CacheDecoratorTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests the CacheDecorator.
  *
- * @group Plugin
+ * @group plugin
  */
 class CacheDecoratorTest extends DiscoveryTestBase {
 
diff --git a/core/modules/system/src/Tests/Plugin/Condition/RequestPathTest.php b/core/modules/system/src/Tests/Plugin/Condition/RequestPathTest.php
index c1d4b2a..bb735a0 100644
--- a/core/modules/system/src/Tests/Plugin/Condition/RequestPathTest.php
+++ b/core/modules/system/src/Tests/Plugin/Condition/RequestPathTest.php
@@ -16,7 +16,7 @@
  * Tests that the Request Path Condition, provided by the system module, is
  * working properly.
  *
- * @group Plugin
+ * @group plugin
  */
 class RequestPathTest extends KernelTestBase {
 
diff --git a/core/modules/system/src/Tests/Plugin/ContextPluginTest.php b/core/modules/system/src/Tests/Plugin/ContextPluginTest.php
index 392d9d4..e79864d 100644
--- a/core/modules/system/src/Tests/Plugin/ContextPluginTest.php
+++ b/core/modules/system/src/Tests/Plugin/ContextPluginTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests that contexts are properly set and working within plugins.
  *
- * @group Plugin
+ * @group plugin
  */
 class ContextPluginTest extends KernelTestBase {
 
diff --git a/core/modules/system/src/Tests/Plugin/DerivativeTest.php b/core/modules/system/src/Tests/Plugin/DerivativeTest.php
index 793eeee..639a65b 100644
--- a/core/modules/system/src/Tests/Plugin/DerivativeTest.php
+++ b/core/modules/system/src/Tests/Plugin/DerivativeTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests that derivative plugins are correctly discovered.
  *
- * @group Plugin
+ * @group plugin
  */
 class DerivativeTest extends PluginTestBase {
 
diff --git a/core/modules/system/src/Tests/Plugin/Discovery/AnnotatedClassDiscoveryTest.php b/core/modules/system/src/Tests/Plugin/Discovery/AnnotatedClassDiscoveryTest.php
index 7d0d981..115c35c 100644
--- a/core/modules/system/src/Tests/Plugin/Discovery/AnnotatedClassDiscoveryTest.php
+++ b/core/modules/system/src/Tests/Plugin/Discovery/AnnotatedClassDiscoveryTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that plugins are correctly discovered using annotated classes.
  *
- * @group Plugin
+ * @group plugin
  */
 class AnnotatedClassDiscoveryTest extends DiscoveryTestBase {
 
diff --git a/core/modules/system/src/Tests/Plugin/Discovery/CustomAnnotationClassDiscoveryTest.php b/core/modules/system/src/Tests/Plugin/Discovery/CustomAnnotationClassDiscoveryTest.php
index eb5285e..ae1bdbb 100644
--- a/core/modules/system/src/Tests/Plugin/Discovery/CustomAnnotationClassDiscoveryTest.php
+++ b/core/modules/system/src/Tests/Plugin/Discovery/CustomAnnotationClassDiscoveryTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that a custom annotation class is used.
  *
- * @group Plugin
+ * @group plugin
  * @see \Drupal\plugin_test\Plugin\Annotation\PluginExample
  */
 class CustomAnnotationClassDiscoveryTest extends DiscoveryTestBase {
diff --git a/core/modules/system/src/Tests/Plugin/Discovery/CustomDirectoryAnnotatedClassDiscoveryTest.php b/core/modules/system/src/Tests/Plugin/Discovery/CustomDirectoryAnnotatedClassDiscoveryTest.php
index aa29a09..630976c 100644
--- a/core/modules/system/src/Tests/Plugin/Discovery/CustomDirectoryAnnotatedClassDiscoveryTest.php
+++ b/core/modules/system/src/Tests/Plugin/Discovery/CustomDirectoryAnnotatedClassDiscoveryTest.php
@@ -13,7 +13,7 @@
  * Tests that plugins in a custom directory are correctly discovered using
  * annotated classes.
  *
- * @group Plugin
+ * @group plugin
  */
 class CustomDirectoryAnnotatedClassDiscoveryTest extends DiscoveryTestBase {
 
diff --git a/core/modules/system/src/Tests/Plugin/Discovery/StaticDiscoveryTest.php b/core/modules/system/src/Tests/Plugin/Discovery/StaticDiscoveryTest.php
index 905c584..0529186 100644
--- a/core/modules/system/src/Tests/Plugin/Discovery/StaticDiscoveryTest.php
+++ b/core/modules/system/src/Tests/Plugin/Discovery/StaticDiscoveryTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that plugins using static discovery are correctly discovered.
  *
- * @group Plugin
+ * @group plugin
  */
 class StaticDiscoveryTest extends DiscoveryTestBase {
 
diff --git a/core/modules/system/src/Tests/Plugin/FactoryTest.php b/core/modules/system/src/Tests/Plugin/FactoryTest.php
index 44cf55f..58b79fa 100644
--- a/core/modules/system/src/Tests/Plugin/FactoryTest.php
+++ b/core/modules/system/src/Tests/Plugin/FactoryTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that plugins are correctly instantiated.
  *
- * @group Plugin
+ * @group plugin
  */
 class FactoryTest extends PluginTestBase {
 
diff --git a/core/modules/system/src/Tests/Plugin/InspectionTest.php b/core/modules/system/src/Tests/Plugin/InspectionTest.php
index e16f4bf..a5cfe83 100644
--- a/core/modules/system/src/Tests/Plugin/InspectionTest.php
+++ b/core/modules/system/src/Tests/Plugin/InspectionTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests that plugins implementing PluginInspectionInterface are inspectable.
  *
- * @group Plugin
+ * @group plugin
  */
 class InspectionTest extends PluginTestBase {
 
diff --git a/core/modules/system/src/Tests/Queue/QueueTest.php b/core/modules/system/src/Tests/Queue/QueueTest.php
index 20dd70f..553999f 100644
--- a/core/modules/system/src/Tests/Queue/QueueTest.php
+++ b/core/modules/system/src/Tests/Queue/QueueTest.php
@@ -15,7 +15,7 @@
 /**
  * Queues and dequeues a set of items to check the basic queue functionality.
  *
- * @group Queue
+ * @group queue
  */
 class QueueTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Routing/MatcherDumperTest.php b/core/modules/system/src/Tests/Routing/MatcherDumperTest.php
index 3080411..84366d6 100644
--- a/core/modules/system/src/Tests/Routing/MatcherDumperTest.php
+++ b/core/modules/system/src/Tests/Routing/MatcherDumperTest.php
@@ -20,7 +20,7 @@
 /**
  * Confirm that the matcher dumper is functioning properly.
  *
- * @group Routing
+ * @group routing
  */
 class MatcherDumperTest extends UnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Routing/RouteProviderTest.php b/core/modules/system/src/Tests/Routing/RouteProviderTest.php
index 1600f8e..b717e8a 100644
--- a/core/modules/system/src/Tests/Routing/RouteProviderTest.php
+++ b/core/modules/system/src/Tests/Routing/RouteProviderTest.php
@@ -25,7 +25,7 @@
 /**
  * Confirm that the default route provider is working correctly.
  *
- * @group Routing
+ * @group routing
  */
 class RouteProviderTest extends UnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Routing/RouterPermissionTest.php b/core/modules/system/src/Tests/Routing/RouterPermissionTest.php
index 948017f..c87a4d2 100644
--- a/core/modules/system/src/Tests/Routing/RouterPermissionTest.php
+++ b/core/modules/system/src/Tests/Routing/RouterPermissionTest.php
@@ -14,7 +14,7 @@
 /**
  * Function Tests for the routing permission system.
  *
- * @group Routing
+ * @group routing
  */
 class RouterPermissionTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Routing/RouterTest.php b/core/modules/system/src/Tests/Routing/RouterTest.php
index a7bb8b2..4ecb614 100644
--- a/core/modules/system/src/Tests/Routing/RouterTest.php
+++ b/core/modules/system/src/Tests/Routing/RouterTest.php
@@ -12,7 +12,7 @@
 /**
  * Functional class for the full integrated routing system.
  *
- * @group Routing
+ * @group routing
  */
 class RouterTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/ServiceProvider/ServiceProviderTest.php b/core/modules/system/src/Tests/ServiceProvider/ServiceProviderTest.php
index 11dc736..a967481 100644
--- a/core/modules/system/src/Tests/ServiceProvider/ServiceProviderTest.php
+++ b/core/modules/system/src/Tests/ServiceProvider/ServiceProviderTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests service provider registration to the DIC.
  *
- * @group ServiceProvider
+ * @group serviceprovider
  */
 class ServiceProviderTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Session/SessionHttpsTest.php b/core/modules/system/src/Tests/Session/SessionHttpsTest.php
index 060205c..76c21db 100644
--- a/core/modules/system/src/Tests/Session/SessionHttpsTest.php
+++ b/core/modules/system/src/Tests/Session/SessionHttpsTest.php
@@ -15,7 +15,7 @@
 /**
  * Ensure that when running under HTTPS two session cookies are generated.
  *
- * @group Session
+ * @group session
  */
 class SessionHttpsTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Session/SessionTest.php b/core/modules/system/src/Tests/Session/SessionTest.php
index b65ca9f..2b3084d 100644
--- a/core/modules/system/src/Tests/Session/SessionTest.php
+++ b/core/modules/system/src/Tests/Session/SessionTest.php
@@ -12,7 +12,7 @@
 /**
  * Drupal session handling tests.
  *
- * @group Session
+ * @group session
  */
 class SessionTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/EnginePhpTemplateTest.php b/core/modules/system/src/Tests/Theme/EnginePhpTemplateTest.php
index c4ef252..23bef11 100644
--- a/core/modules/system/src/Tests/Theme/EnginePhpTemplateTest.php
+++ b/core/modules/system/src/Tests/Theme/EnginePhpTemplateTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests theme functions with PHPTemplate.
  *
- * @group Theme
+ * @group theme
  */
 class EnginePhpTemplateTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/EngineTwigTest.php b/core/modules/system/src/Tests/Theme/EngineTwigTest.php
index 2e89f47..cd2ff0f 100644
--- a/core/modules/system/src/Tests/Theme/EngineTwigTest.php
+++ b/core/modules/system/src/Tests/Theme/EngineTwigTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests Twig-specific theme functionality.
  *
- * @group Theme
+ * @group theme
  */
 class EngineTwigTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/EntityFilteringThemeTest.php b/core/modules/system/src/Tests/Theme/EntityFilteringThemeTest.php
index cbb2492..3b3177e 100644
--- a/core/modules/system/src/Tests/Theme/EntityFilteringThemeTest.php
+++ b/core/modules/system/src/Tests/Theme/EntityFilteringThemeTest.php
@@ -16,7 +16,7 @@
  * Tests themed output for each entity type in all available themes to ensure
  * entity labels are filtered for XSS.
  *
- * @group Theme
+ * @group theme
  */
 class EntityFilteringThemeTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/FastTest.php b/core/modules/system/src/Tests/Theme/FastTest.php
index 2266ea5..af4a8d6 100644
--- a/core/modules/system/src/Tests/Theme/FastTest.php
+++ b/core/modules/system/src/Tests/Theme/FastTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests autocompletion not loading registry.
  *
- * @group Theme
+ * @group theme
  */
 class FastTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/FunctionsTest.php b/core/modules/system/src/Tests/Theme/FunctionsTest.php
index f6eaa6c..02ace30 100644
--- a/core/modules/system/src/Tests/Theme/FunctionsTest.php
+++ b/core/modules/system/src/Tests/Theme/FunctionsTest.php
@@ -16,7 +16,7 @@
 /**
  * Tests for common theme functions.
  *
- * @group Theme
+ * @group theme
  */
 class FunctionsTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/HtmlAttributesTest.php b/core/modules/system/src/Tests/Theme/HtmlAttributesTest.php
index 6bdf042..dfeee44 100644
--- a/core/modules/system/src/Tests/Theme/HtmlAttributesTest.php
+++ b/core/modules/system/src/Tests/Theme/HtmlAttributesTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests attributes inserted in the 'html' and 'body' elements on the page.
  *
- * @group Theme
+ * @group theme
  */
 class HtmlAttributesTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/RegistryTest.php b/core/modules/system/src/Tests/Theme/RegistryTest.php
index 57adf4f..b29f9e9 100644
--- a/core/modules/system/src/Tests/Theme/RegistryTest.php
+++ b/core/modules/system/src/Tests/Theme/RegistryTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the behavior of the ThemeRegistry class.
  *
- * @group Theme
+ * @group theme
  */
 class RegistryTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/TableTest.php b/core/modules/system/src/Tests/Theme/TableTest.php
index 435e79f..b36c528 100644
--- a/core/modules/system/src/Tests/Theme/TableTest.php
+++ b/core/modules/system/src/Tests/Theme/TableTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests built-in table theme functions.
  *
- * @group Theme
+ * @group theme
  */
 class TableTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/ThemeEarlyInitializationTest.php b/core/modules/system/src/Tests/Theme/ThemeEarlyInitializationTest.php
index 04730d2..37bbe30 100644
--- a/core/modules/system/src/Tests/Theme/ThemeEarlyInitializationTest.php
+++ b/core/modules/system/src/Tests/Theme/ThemeEarlyInitializationTest.php
@@ -13,7 +13,7 @@
  * Tests that the theme system can be correctly initialized early in the page
  * request.
  *
- * @group Theme
+ * @group theme
  */
 class ThemeEarlyInitializationTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/ThemeInfoStylesTest.php b/core/modules/system/src/Tests/Theme/ThemeInfoStylesTest.php
index 764d0b9..4493cf1 100644
--- a/core/modules/system/src/Tests/Theme/ThemeInfoStylesTest.php
+++ b/core/modules/system/src/Tests/Theme/ThemeInfoStylesTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests processing of theme .info.yml stylesheets.
  *
- * @group Theme
+ * @group theme
  */
 class ThemeInfoStylesTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/ThemeSettingsTest.php b/core/modules/system/src/Tests/Theme/ThemeSettingsTest.php
index 3ca4d34..06977ac 100644
--- a/core/modules/system/src/Tests/Theme/ThemeSettingsTest.php
+++ b/core/modules/system/src/Tests/Theme/ThemeSettingsTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests theme settings functionality.
  *
- * @group Theme
+ * @group theme
  */
 class ThemeSettingsTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/ThemeSuggestionsAlterTest.php b/core/modules/system/src/Tests/Theme/ThemeSuggestionsAlterTest.php
index ff8c292..05c65ed 100644
--- a/core/modules/system/src/Tests/Theme/ThemeSuggestionsAlterTest.php
+++ b/core/modules/system/src/Tests/Theme/ThemeSuggestionsAlterTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests theme suggestion alter hooks.
  *
- * @group Theme
+ * @group theme
  */
 class ThemeSuggestionsAlterTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/ThemeTest.php b/core/modules/system/src/Tests/Theme/ThemeTest.php
index d41ec8d..3021685 100644
--- a/core/modules/system/src/Tests/Theme/ThemeTest.php
+++ b/core/modules/system/src/Tests/Theme/ThemeTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests low-level theme functions.
  *
- * @group Theme
+ * @group theme
  */
 class ThemeTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/TwigDebugMarkupTest.php b/core/modules/system/src/Tests/Theme/TwigDebugMarkupTest.php
index 2836c2c..db3701e 100644
--- a/core/modules/system/src/Tests/Theme/TwigDebugMarkupTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigDebugMarkupTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests for Twig debug markup.
  *
- * @group Theme
+ * @group theme
  */
 class TwigDebugMarkupTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/TwigExtensionTest.php b/core/modules/system/src/Tests/Theme/TwigExtensionTest.php
index 0191657..3c4dca7 100644
--- a/core/modules/system/src/Tests/Theme/TwigExtensionTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigExtensionTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests Twig extensions.
  *
- * @group Theme
+ * @group theme
  */
 class TwigExtensionTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/TwigFilterTest.php b/core/modules/system/src/Tests/Theme/TwigFilterTest.php
index c22be7f..c7f7498 100644
--- a/core/modules/system/src/Tests/Theme/TwigFilterTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigFilterTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests Drupal's Twig filters.
  *
- * @group Theme
+ * @group theme
  */
 class TwigFilterTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/TwigNamespaceTest.php b/core/modules/system/src/Tests/Theme/TwigNamespaceTest.php
index 0d8bead..c8a48a4 100644
--- a/core/modules/system/src/Tests/Theme/TwigNamespaceTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigNamespaceTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests Twig namespaces.
  *
- * @group Theme
+ * @group theme
  */
 class TwigNamespaceTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/TwigRawTest.php b/core/modules/system/src/Tests/Theme/TwigRawTest.php
index 5f8f0a8..8deb10a 100644
--- a/core/modules/system/src/Tests/Theme/TwigRawTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigRawTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests Twig 'raw' filter.
  *
- * @group Theme
+ * @group theme
  */
 class TwigRawTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/TwigSettingsTest.php b/core/modules/system/src/Tests/Theme/TwigSettingsTest.php
index 630fc14..1b6dd59 100644
--- a/core/modules/system/src/Tests/Theme/TwigSettingsTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigSettingsTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests overriding Twig engine settings via settings.php.
  *
- * @group Theme
+ * @group theme
  */
 class TwigSettingsTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Theme/TwigTransTest.php b/core/modules/system/src/Tests/Theme/TwigTransTest.php
index 20beeb5..6e7a8e8 100644
--- a/core/modules/system/src/Tests/Theme/TwigTransTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigTransTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests Twig "trans" tags.
  *
- * @group Theme
+ * @group theme
  */
 class TwigTransTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Transliteration/TransliterationTest.php b/core/modules/system/src/Tests/Transliteration/TransliterationTest.php
index 27aa4dd..8429dfa 100644
--- a/core/modules/system/src/Tests/Transliteration/TransliterationTest.php
+++ b/core/modules/system/src/Tests/Transliteration/TransliterationTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests Transliteration component functionality.
  *
- * @group Transliteration
+ * @group transliteration
  */
 class TransliterationTest extends DrupalUnitTestBase {
   /**
diff --git a/core/modules/system/src/Tests/TypedData/TypedDataDefinitionTest.php b/core/modules/system/src/Tests/TypedData/TypedDataDefinitionTest.php
index d5da1b7..becefaa 100644
--- a/core/modules/system/src/Tests/TypedData/TypedDataDefinitionTest.php
+++ b/core/modules/system/src/Tests/TypedData/TypedDataDefinitionTest.php
@@ -20,7 +20,7 @@
 /**
  * Tests deriving metadata of core data types.
  *
- * @group TypedData
+ * @group typeddata
  */
 class TypedDataDefinitionTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/TypedData/TypedDataTest.php b/core/modules/system/src/Tests/TypedData/TypedDataTest.php
index bc9bd8c..0df99ac 100644
--- a/core/modules/system/src/Tests/TypedData/TypedDataTest.php
+++ b/core/modules/system/src/Tests/TypedData/TypedDataTest.php
@@ -17,7 +17,7 @@
 /**
  * Tests the functionality of all core data types.
  *
- * @group TypedData
+ * @group typeddata
  */
 class TypedDataTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Update/DependencyHookInvocationTest.php b/core/modules/system/src/Tests/Update/DependencyHookInvocationTest.php
index 2c417e9..3b35844 100644
--- a/core/modules/system/src/Tests/Update/DependencyHookInvocationTest.php
+++ b/core/modules/system/src/Tests/Update/DependencyHookInvocationTest.php
@@ -13,7 +13,7 @@
  * Tests that the hook invocation for determining update dependencies works
  * correctly.
  *
- * @group Update
+ * @group update
  */
 class DependencyHookInvocationTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Update/DependencyMissingTest.php b/core/modules/system/src/Tests/Update/DependencyMissingTest.php
index df463c3..8ac4775 100644
--- a/core/modules/system/src/Tests/Update/DependencyMissingTest.php
+++ b/core/modules/system/src/Tests/Update/DependencyMissingTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that missing update dependencies are correctly flagged.
  *
- * @group Update
+ * @group update
  */
 class DependencyMissingTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Update/DependencyOrderingTest.php b/core/modules/system/src/Tests/Update/DependencyOrderingTest.php
index c0c98cf..c078fe2 100644
--- a/core/modules/system/src/Tests/Update/DependencyOrderingTest.php
+++ b/core/modules/system/src/Tests/Update/DependencyOrderingTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that update functions are run in the proper order.
  *
- * @group Update
+ * @group update
  */
 class DependencyOrderingTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Update/InvalidUpdateHookTest.php b/core/modules/system/src/Tests/Update/InvalidUpdateHookTest.php
index 0afc8e9..11792f0 100644
--- a/core/modules/system/src/Tests/Update/InvalidUpdateHookTest.php
+++ b/core/modules/system/src/Tests/Update/InvalidUpdateHookTest.php
@@ -14,7 +14,7 @@
  * Tests that a module implementing hook_update_8000() causes an error to be
  * displayed on update.
  *
- * @group Update
+ * @group update
  */
 class InvalidUpdateHookTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Update/UpdateScriptTest.php b/core/modules/system/src/Tests/Update/UpdateScriptTest.php
index a040529..47f9e77 100644
--- a/core/modules/system/src/Tests/Update/UpdateScriptTest.php
+++ b/core/modules/system/src/Tests/Update/UpdateScriptTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the update script access and functionality.
  *
- * @group Update
+ * @group update
  */
 class UpdateScriptTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Update/UpdatesWith7xTest.php b/core/modules/system/src/Tests/Update/UpdatesWith7xTest.php
index cd66db6..08c8829 100644
--- a/core/modules/system/src/Tests/Update/UpdatesWith7xTest.php
+++ b/core/modules/system/src/Tests/Update/UpdatesWith7xTest.php
@@ -13,7 +13,7 @@
  * Tests that the minimum schema version is correct even if only 7.x update
  * hooks are retained .
  *
- * @group Update
+ * @group update
  */
 class UpdatesWith7xTest extends WebTestBase {
 
diff --git a/core/modules/system/src/Tests/Validation/AllowedValuesConstraintValidatorTest.php b/core/modules/system/src/Tests/Validation/AllowedValuesConstraintValidatorTest.php
index 8b5bec0..7b383bb 100644
--- a/core/modules/system/src/Tests/Validation/AllowedValuesConstraintValidatorTest.php
+++ b/core/modules/system/src/Tests/Validation/AllowedValuesConstraintValidatorTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests AllowedValues validation constraint with both valid and invalid values.
  *
- * @group Validation
+ * @group validation
  */
 class AllowedValuesConstraintValidatorTest extends DrupalUnitTestBase {
 
diff --git a/core/modules/system/src/Tests/Validation/ComplexDataConstraintValidatorTest.php b/core/modules/system/src/Tests/Validation/ComplexDataConstraintValidatorTest.php
index dccd03e..edec5c4 100644
--- a/core/modules/system/src/Tests/Validation/ComplexDataConstraintValidatorTest.php
+++ b/core/modules/system/src/Tests/Validation/ComplexDataConstraintValidatorTest.php
@@ -15,7 +15,7 @@
  * Tests ComplexData validation constraint with both valid and invalid values
  * for a key.
  *
- * @group Validation
+ * @group validation
  */
 class ComplexDataConstraintValidatorTest extends DrupalUnitTestBase {
 
diff --git a/core/tests/Drupal/Tests/Component/Datetime/DateTimePlusTest.php b/core/tests/Drupal/Tests/Component/Datetime/DateTimePlusTest.php
index 0f8e738..1bbb9d2 100644
--- a/core/tests/Drupal/Tests/Component/Datetime/DateTimePlusTest.php
+++ b/core/tests/Drupal/Tests/Component/Datetime/DateTimePlusTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Datetime\DateTimePlus
- * @group Datetime
+ * @group datetime
  */
 class DateTimePlusTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Discovery/YamlDiscoveryTest.php b/core/tests/Drupal/Tests/Component/Discovery/YamlDiscoveryTest.php
index a546992..f83d213 100644
--- a/core/tests/Drupal/Tests/Component/Discovery/YamlDiscoveryTest.php
+++ b/core/tests/Drupal/Tests/Component/Discovery/YamlDiscoveryTest.php
@@ -13,7 +13,7 @@
 /**
  * YamlDiscovery component unit tests.
  *
- * @group Discovery
+ * @group discovery
  */
 class YamlDiscoveryTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Graph/GraphTest.php b/core/tests/Drupal/Tests/Component/Graph/GraphTest.php
index 4049a26..db82acf 100644
--- a/core/tests/Drupal/Tests/Component/Graph/GraphTest.php
+++ b/core/tests/Drupal/Tests/Component/Graph/GraphTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Graph\Graph
- * @group Graph
+ * @group graph
  */
 class GraphTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Image/ImageUtilityTest.php b/core/tests/Drupal/Tests/Component/Image/ImageUtilityTest.php
index 3c51ca9..915fe07 100644
--- a/core/tests/Drupal/Tests/Component/Image/ImageUtilityTest.php
+++ b/core/tests/Drupal/Tests/Component/Image/ImageUtilityTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\Image
- * @group Image
+ * @group image
  */
 class ImageUtilityTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/PhpStorage/FileStorageReadOnlyTest.php b/core/tests/Drupal/Tests/Component/PhpStorage/FileStorageReadOnlyTest.php
index e0497b8..28a8679 100644
--- a/core/tests/Drupal/Tests/Component/PhpStorage/FileStorageReadOnlyTest.php
+++ b/core/tests/Drupal/Tests/Component/PhpStorage/FileStorageReadOnlyTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\PhpStorage\FileReadOnlyStorage
- * @group PhpStorage
+ * @group phpstorage
  */
 class FileStorageReadOnlyTest extends PhpStorageTestBase {
 
@@ -52,8 +52,8 @@ public function setUp() {
   /**
    * Tests writing with one class and reading with another.
    *
-   * @group Drupal
-   * @group PhpStorage
+   * @group drupal
+   * @group phpstorage
    */
   public function testReadOnly() {
     $php = new FileStorage($this->standardSettings);
@@ -83,8 +83,8 @@ public function testReadOnly() {
   /**
    * Tests writeable() method.
    *
-   * @group Drupal
-   * @group PhpStorage
+   * @group drupal
+   * @group phpstorage
    */
   public function testWriteable() {
     $php_read = new FileReadOnlyStorage($this->readonlyStorage);
@@ -94,8 +94,8 @@ public function testWriteable() {
   /**
    * Tests deleteAll() method.
    *
-   * @group Drupal
-   * @group PhpStorage
+   * @group drupal
+   * @group phpstorage
    */
   public function testDeleteAll() {
     $php_read = new FileReadOnlyStorage($this->readonlyStorage);
diff --git a/core/tests/Drupal/Tests/Component/PhpStorage/FileStorageTest.php b/core/tests/Drupal/Tests/Component/PhpStorage/FileStorageTest.php
index 80dac1b..6019f4f 100644
--- a/core/tests/Drupal/Tests/Component/PhpStorage/FileStorageTest.php
+++ b/core/tests/Drupal/Tests/Component/PhpStorage/FileStorageTest.php
@@ -11,7 +11,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\PhpStorage\FileStorage
- * @group PhpStorage
+ * @group phpstorage
  */
 class FileStorageTest extends PhpStorageTestBase {
 
@@ -39,8 +39,8 @@ public function setUp() {
   /**
    * Tests basic load/save/delete operations.
    *
-   * @group Drupal
-   * @group PhpStorage
+   * @group drupal
+   * @group phpstorage
    */
   public function testCRUD() {
     $php = new FileStorage($this->standardSettings);
@@ -50,8 +50,8 @@ public function testCRUD() {
   /**
    * Tests writeable() method.
    *
-   * @group Drupal
-   * @group PhpStorage
+   * @group drupal
+   * @group phpstorage
    */
   public function testWriteable() {
     $php = new FileStorage($this->standardSettings);
@@ -61,8 +61,8 @@ public function testWriteable() {
   /**
    * Tests deleteAll() method.
    *
-   * @group Drupal
-   * @group PhpStorage
+   * @group drupal
+   * @group phpstorage
    */
   public function testDeleteAll() {
 
diff --git a/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFastFileStorageTest.php b/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFastFileStorageTest.php
index 2fad11a..b1774e4 100644
--- a/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFastFileStorageTest.php
+++ b/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFastFileStorageTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the MTimeProtectedFastFileStorage implementation.
  *
- * @group PhpStorage
+ * @group phpstorage
  */
 class MTimeProtectedFastFileStorageTest extends MTimeProtectedFileStorageBase {
 
diff --git a/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFileStorageTest.php b/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFileStorageTest.php
index edf9e32..65689cd 100644
--- a/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFileStorageTest.php
+++ b/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFileStorageTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the MTimeProtectedFileStorage implementation.
  *
- * @group PhpStorage
+ * @group phpstorage
  */
 class MTimeProtectedFileStorageTest extends MTimeProtectedFileStorageBase {
 
diff --git a/core/tests/Drupal/Tests/Component/Plugin/PluginBaseTest.php b/core/tests/Drupal/Tests/Component/Plugin/PluginBaseTest.php
index 97e4275..33aff22 100644
--- a/core/tests/Drupal/Tests/Component/Plugin/PluginBaseTest.php
+++ b/core/tests/Drupal/Tests/Component/Plugin/PluginBaseTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Plugin\PluginBase
- * @group Plugin
+ * @group plugin
  */
 class PluginBaseTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Serialization/JsonTest.php b/core/tests/Drupal/Tests/Component/Serialization/JsonTest.php
index bb2d27a..b824652 100644
--- a/core/tests/Drupal/Tests/Component/Serialization/JsonTest.php
+++ b/core/tests/Drupal/Tests/Component/Serialization/JsonTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Serialization\Json
- * @group Serialization
+ * @group serialization
  */
 class JsonTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/BytesTest.php b/core/tests/Drupal/Tests/Component/Utility/BytesTest.php
index bfacd6c..73079bf 100644
--- a/core/tests/Drupal/Tests/Component/Utility/BytesTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/BytesTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\Bytes
- * @group Utility
+ * @group utility
  */
 class BytesTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/CryptTest.php b/core/tests/Drupal/Tests/Component/Utility/CryptTest.php
index 94929ee..5a7993e 100644
--- a/core/tests/Drupal/Tests/Component/Utility/CryptTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/CryptTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\Crypt
- * @group Utility
+ * @group utility
  */
 class CryptTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/EnvironmentTest.php b/core/tests/Drupal/Tests/Component/Utility/EnvironmentTest.php
index d7713e0..7c587c5 100644
--- a/core/tests/Drupal/Tests/Component/Utility/EnvironmentTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/EnvironmentTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\Environment
- * @group Utility
+ * @group utility
  */
 class EnvironmentTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/NestedArrayTest.php b/core/tests/Drupal/Tests/Component/Utility/NestedArrayTest.php
index ee1e305..3cc54d2 100644
--- a/core/tests/Drupal/Tests/Component/Utility/NestedArrayTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/NestedArrayTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\NestedArray
- * @group Utility
+ * @group utility
  */
 class NestedArrayTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/NumberAlphadecimalTest.php b/core/tests/Drupal/Tests/Component/Utility/NumberAlphadecimalTest.php
index 01d2c2b..c5fdeb2 100644
--- a/core/tests/Drupal/Tests/Component/Utility/NumberAlphadecimalTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/NumberAlphadecimalTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\Number
- * @group Utility
+ * @group utility
  */
 class NumberAlphadecimalTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/NumberTest.php b/core/tests/Drupal/Tests/Component/Utility/NumberTest.php
index d1d1ea2..e8048cd 100644
--- a/core/tests/Drupal/Tests/Component/Utility/NumberTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/NumberTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests number step validation by Number::validStep().
  *
- * @group Utility
+ * @group utility
  */
 class NumberTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/RandomTest.php b/core/tests/Drupal/Tests/Component/Utility/RandomTest.php
index cda119e..f867c0d 100644
--- a/core/tests/Drupal/Tests/Component/Utility/RandomTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/RandomTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\Random
- * @group Utility
+ * @group utility
  */
 class RandomTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/SortArrayTest.php b/core/tests/Drupal/Tests/Component/Utility/SortArrayTest.php
index ed1357b..d4f6b01 100644
--- a/core/tests/Drupal/Tests/Component/Utility/SortArrayTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/SortArrayTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\SortArray
- * @group Utility
+ * @group utility
  */
 class SortArrayTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/StringTest.php b/core/tests/Drupal/Tests/Component/Utility/StringTest.php
index 21127b5..23e4a4e 100644
--- a/core/tests/Drupal/Tests/Component/Utility/StringTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/StringTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\String
- * @group Utility
+ * @group utility
  */
 class StringTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/TimerTest.php b/core/tests/Drupal/Tests/Component/Utility/TimerTest.php
index f306896..704f93b 100644
--- a/core/tests/Drupal/Tests/Component/Utility/TimerTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/TimerTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\Timer
- * @group Utility
+ * @group utility
  */
 class TimerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/UnicodeTest.php b/core/tests/Drupal/Tests/Component/Utility/UnicodeTest.php
index 1900967..d07ae85 100644
--- a/core/tests/Drupal/Tests/Component/Utility/UnicodeTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/UnicodeTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\Unicode
- * @group Utility
+ * @group utility
  */
 class UnicodeTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/UrlHelperTest.php b/core/tests/Drupal/Tests/Component/Utility/UrlHelperTest.php
index 8eddb48..da2be40 100644
--- a/core/tests/Drupal/Tests/Component/Utility/UrlHelperTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/UrlHelperTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\Url
- * @group Utility
+ * @group utility
  */
 class UrlHelperTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Component/Utility/XssTest.php b/core/tests/Drupal/Tests/Component/Utility/XssTest.php
index a682fb1..496c3b5 100644
--- a/core/tests/Drupal/Tests/Component/Utility/XssTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/XssTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Utility\Xss
- * @group Utility
+ * @group utility
  *
  * Script injection vectors mostly adopted from http://ha.ckers.org/xss.html.
  *
diff --git a/core/tests/Drupal/Tests/Component/Uuid/UuidTest.php b/core/tests/Drupal/Tests/Component/Uuid/UuidTest.php
index 1f00819..7c524c5 100644
--- a/core/tests/Drupal/Tests/Component/Uuid/UuidTest.php
+++ b/core/tests/Drupal/Tests/Component/Uuid/UuidTest.php
@@ -18,7 +18,7 @@
 /**
  * Tests the handling of Universally Unique Identifiers (UUIDs).
  *
- * @group Uuid
+ * @group uuid
  */
 class UuidTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Access/AccessArgumentsResolverTest.php b/core/tests/Drupal/Tests/Core/Access/AccessArgumentsResolverTest.php
index 2a46556..d6bca77 100644
--- a/core/tests/Drupal/Tests/Core/Access/AccessArgumentsResolverTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/AccessArgumentsResolverTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Access\AccessArgumentsResolver
- * @group Access
+ * @group access
  */
 class AccessArgumentsResolverTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Access/AccessManagerTest.php b/core/tests/Drupal/Tests/Core/Access/AccessManagerTest.php
index 004067c..23b6429 100644
--- a/core/tests/Drupal/Tests/Core/Access/AccessManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/AccessManagerTest.php
@@ -22,7 +22,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Access\AccessManager
- * @group Access
+ * @group access
  */
 class AccessManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Access/CsrfAccessCheckTest.php b/core/tests/Drupal/Tests/Core/Access/CsrfAccessCheckTest.php
index a4319db..3b17e04 100644
--- a/core/tests/Drupal/Tests/Core/Access/CsrfAccessCheckTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/CsrfAccessCheckTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Access\CsrfAccessCheck
- * @group Access
+ * @group access
  */
 class CsrfAccessCheckTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php b/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php
index cb8330f..f171a49 100644
--- a/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php
@@ -16,7 +16,7 @@
 /**
  * Tests the CsrfTokenGenerator class.
  *
- * @group Access
+ * @group access
  */
 class CsrfTokenGeneratorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Access/CustomAccessCheckTest.php b/core/tests/Drupal/Tests/Core/Access/CustomAccessCheckTest.php
index 23f500d..89c391d 100644
--- a/core/tests/Drupal/Tests/Core/Access/CustomAccessCheckTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/CustomAccessCheckTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Access\CustomAccessCheck
- * @group Access
+ * @group access
  */
 class CustomAccessCheckTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Access/DefaultAccessCheckTest.php b/core/tests/Drupal/Tests/Core/Access/DefaultAccessCheckTest.php
index 0af32a4..c76a5d5 100644
--- a/core/tests/Drupal/Tests/Core/Access/DefaultAccessCheckTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/DefaultAccessCheckTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Access\DefaultAccessCheck
- * @group Access
+ * @group access
  */
 class DefaultAccessCheckTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Access/RouteProcessorCsrfTest.php b/core/tests/Drupal/Tests/Core/Access/RouteProcessorCsrfTest.php
index 5ade935..3dcc1c3 100644
--- a/core/tests/Drupal/Tests/Core/Access/RouteProcessorCsrfTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/RouteProcessorCsrfTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Access\RouteProcessorCsrf
- * @group Access
+ * @group access
  */
 class RouteProcessorCsrfTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Ajax/AjaxCommandsTest.php b/core/tests/Drupal/Tests/Core/Ajax/AjaxCommandsTest.php
index 8e61768..5fb8daa 100644
--- a/core/tests/Drupal/Tests/Core/Ajax/AjaxCommandsTest.php
+++ b/core/tests/Drupal/Tests/Core/Ajax/AjaxCommandsTest.php
@@ -35,7 +35,7 @@
 /**
  * Tests that each AJAX command object can be created and rendered.
  *
- * @group Ajax
+ * @group ajax
  */
 class AjaxCommandsTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Ajax/AjaxResponseRendererTest.php b/core/tests/Drupal/Tests/Core/Ajax/AjaxResponseRendererTest.php
index 035c1e4..b1eb8b5 100644
--- a/core/tests/Drupal/Tests/Core/Ajax/AjaxResponseRendererTest.php
+++ b/core/tests/Drupal/Tests/Core/Ajax/AjaxResponseRendererTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Ajax\AjaxResponseRenderer
- * @group Ajax
+ * @group ajax
  */
 class AjaxResponseRendererTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Ajax/AjaxResponseTest.php b/core/tests/Drupal/Tests/Core/Ajax/AjaxResponseTest.php
index 0ddb9a4..6e4c945 100644
--- a/core/tests/Drupal/Tests/Core/Ajax/AjaxResponseTest.php
+++ b/core/tests/Drupal/Tests/Core/Ajax/AjaxResponseTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Ajax\AjaxResponse
- * @group Ajax
+ * @group ajax
  */
 class AjaxResponseTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Annotation/TranslationTest.php b/core/tests/Drupal/Tests/Core/Annotation/TranslationTest.php
index 5255791..e08312e 100644
--- a/core/tests/Drupal/Tests/Core/Annotation/TranslationTest.php
+++ b/core/tests/Drupal/Tests/Core/Annotation/TranslationTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Annotation\Translation
- * @group Annotation
+ * @group annotation
  */
 class TranslationTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Asset/CssCollectionGrouperUnitTest.php b/core/tests/Drupal/Tests/Core/Asset/CssCollectionGrouperUnitTest.php
index ff250af..0ce52d1 100644
--- a/core/tests/Drupal/Tests/Core/Asset/CssCollectionGrouperUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Asset/CssCollectionGrouperUnitTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests the CSS asset collection grouper.
  *
- * @group Asset
+ * @group asset
  */
 class CssCollectionGrouperUnitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Asset/CssCollectionRendererUnitTest.php b/core/tests/Drupal/Tests/Core/Asset/CssCollectionRendererUnitTest.php
index c04be0a..9f53091 100644
--- a/core/tests/Drupal/Tests/Core/Asset/CssCollectionRendererUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Asset/CssCollectionRendererUnitTest.php
@@ -38,7 +38,7 @@ function file_create_url($uri) {
 /**
  * Tests the CSS asset collection renderer.
  *
- * @group Asset
+ * @group asset
  */
 class CssCollectionRendererUnitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Asset/CssOptimizerUnitTest.php b/core/tests/Drupal/Tests/Core/Asset/CssOptimizerUnitTest.php
index da5f590..97bc4bb 100644
--- a/core/tests/Drupal/Tests/Core/Asset/CssOptimizerUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Asset/CssOptimizerUnitTest.php
@@ -44,7 +44,7 @@ function file_uri_scheme($uri) {
 /**
  * Tests the CSS asset optimizer.
  *
- * @group Asset
+ * @group asset
  */
 class CssOptimizerUnitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryCollectorTest.php b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryCollectorTest.php
index 8a0935e..e804535 100644
--- a/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryCollectorTest.php
+++ b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryCollectorTest.php
@@ -8,7 +8,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Asset\LibraryDiscoveryCollector
- * @group Asset
+ * @group asset
  */
 class LibraryDiscoveryCollectorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
index 15b323d..c81fe5f 100644
--- a/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
+++ b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
@@ -30,7 +30,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Asset\LibraryDiscoveryParser
- * @group Asset
+ * @group asset
  */
 class LibraryDiscoveryParserTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Batch/PercentagesTest.php b/core/tests/Drupal/Tests/Core/Batch/PercentagesTest.php
index d415d0b..b9ffa85 100644
--- a/core/tests/Drupal/Tests/Core/Batch/PercentagesTest.php
+++ b/core/tests/Drupal/Tests/Core/Batch/PercentagesTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Batch\Batch
- * @group Batch
+ * @group batch
  *
  * Tests the Batch helper object to make sure that the rounding works properly
  * in all cases.
diff --git a/core/tests/Drupal/Tests/Core/Breadcrumb/BreadcrumbManagerTest.php b/core/tests/Drupal/Tests/Core/Breadcrumb/BreadcrumbManagerTest.php
index a2cbbf0..507a664 100644
--- a/core/tests/Drupal/Tests/Core/Breadcrumb/BreadcrumbManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Breadcrumb/BreadcrumbManagerTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Breadcrumb\BreadcrumbManager
- * @group Breadcrumb
+ * @group breadcrumb
  */
 class BreadcrumbManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Cache/BackendChainImplementationUnitTest.php b/core/tests/Drupal/Tests/Core/Cache/BackendChainImplementationUnitTest.php
index 8a9ad35..91196de 100644
--- a/core/tests/Drupal/Tests/Core/Cache/BackendChainImplementationUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Cache/BackendChainImplementationUnitTest.php
@@ -15,7 +15,7 @@
 /**
  * Unit test of backend chain implementation specifics.
  *
- * @group Cache
+ * @group cache
  */
 class BackendChainImplementationUnitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Cache/CacheCollectorTest.php b/core/tests/Drupal/Tests/Core/Cache/CacheCollectorTest.php
index f584719..6b4293b 100644
--- a/core/tests/Drupal/Tests/Core/Cache/CacheCollectorTest.php
+++ b/core/tests/Drupal/Tests/Core/Cache/CacheCollectorTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Cache\CacheCollector
- * @group Cache
+ * @group cache
  */
 class CacheCollectorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Cache/CacheContextsTest.php b/core/tests/Drupal/Tests/Core/Cache/CacheContextsTest.php
index ca868e3..de3dae6 100644
--- a/core/tests/Drupal/Tests/Core/Cache/CacheContextsTest.php
+++ b/core/tests/Drupal/Tests/Core/Cache/CacheContextsTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Cache\CacheContexts
- * @group Cache
+ * @group cache
  */
 class CacheContextsTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Cache/CacheFactoryTest.php b/core/tests/Drupal/Tests/Core/Cache/CacheFactoryTest.php
index 4869bea..776a300 100644
--- a/core/tests/Drupal/Tests/Core/Cache/CacheFactoryTest.php
+++ b/core/tests/Drupal/Tests/Core/Cache/CacheFactoryTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Cache\CacheFactory
- * @group Cache
+ * @group cache
  */
 class CacheFactoryTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Cache/ChainedFastBackendTest.php b/core/tests/Drupal/Tests/Core/Cache/ChainedFastBackendTest.php
index 509203c..ae1b7c8 100644
--- a/core/tests/Drupal/Tests/Core/Cache/ChainedFastBackendTest.php
+++ b/core/tests/Drupal/Tests/Core/Cache/ChainedFastBackendTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Cache\ChainedFastBackend
- * @group Cache
+ * @group cache
  */
 class ChainedFastBackendTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Cache/NullBackendTest.php b/core/tests/Drupal/Tests/Core/Cache/NullBackendTest.php
index e9d448e..1a544de 100644
--- a/core/tests/Drupal/Tests/Core/Cache/NullBackendTest.php
+++ b/core/tests/Drupal/Tests/Core/Cache/NullBackendTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the cache NullBackend.
  *
- * @group Cache
+ * @group cache
  */
 class NullBackendTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Common/AttributesTest.php b/core/tests/Drupal/Tests/Core/Common/AttributesTest.php
index 1dafef9..9a295c5 100644
--- a/core/tests/Drupal/Tests/Core/Common/AttributesTest.php
+++ b/core/tests/Drupal/Tests/Core/Common/AttributesTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the Drupal\Core\Template\Attribute functionality.
  *
- * @group Common
+ * @group common
  */
 class AttributesTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Common/DiffArrayTest.php b/core/tests/Drupal/Tests/Core/Common/DiffArrayTest.php
index 03a6080..61efc01 100644
--- a/core/tests/Drupal/Tests/Core/Common/DiffArrayTest.php
+++ b/core/tests/Drupal/Tests/Core/Common/DiffArrayTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the DiffArray helper class.
  *
- * @group Common
+ * @group common
  */
 class DiffArrayTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Common/TagsTest.php b/core/tests/Drupal/Tests/Core/Common/TagsTest.php
index d93ab72..f4c7590 100644
--- a/core/tests/Drupal/Tests/Core/Common/TagsTest.php
+++ b/core/tests/Drupal/Tests/Core/Common/TagsTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests explosion and implosion of autocomplete tags.
  *
- * @group Common
+ * @group common
  */
 class TagsTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Condition/ConditionAccessResolverTraitTest.php b/core/tests/Drupal/Tests/Core/Condition/ConditionAccessResolverTraitTest.php
index b3c4706..e1f8370 100644
--- a/core/tests/Drupal/Tests/Core/Condition/ConditionAccessResolverTraitTest.php
+++ b/core/tests/Drupal/Tests/Core/Condition/ConditionAccessResolverTraitTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Condition\ConditionAccessResolverTrait
- * @group Condition
+ * @group condition
  */
 class ConditionAccessResolverTraitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Config/CachedStorageTest.php b/core/tests/Drupal/Tests/Core/Config/CachedStorageTest.php
index 619d57d..abdc1c6 100644
--- a/core/tests/Drupal/Tests/Core/Config/CachedStorageTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/CachedStorageTest.php
@@ -10,7 +10,7 @@
 /**
  * Tests the interaction of cache and file storage in CachedStorage.
  *
- * @group Config
+ * @group config
  */
 class CachedStorageTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigDependencyManagerTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigDependencyManagerTest.php
index ff50e9c..236c2e8 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigDependencyManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigDependencyManagerTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the ConfigDependencyManager class.
  *
- * @group Config
+ * @group config
  */
 class ConfigDependencyManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php
index e5dea6d..fd5943b 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Config\Entity\ConfigEntityBase
- * @group Config
+ * @group config
  */
 class ConfigEntityBaseUnitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityDependencyTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityDependencyTest.php
index 98a9d31..954e2af 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityDependencyTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityDependencyTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the ConfigEntityDependency class.
  *
- * @group Config
+ * @group config
  */
 class ConfigEntityDependencyTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php
index 73c558f..a511bfb 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Config\Entity\ConfigEntityStorage
- * @group Config
+ * @group config
  */
 class ConfigEntityStorageTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityTypeTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityTypeTest.php
index 207315c..7c011db 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityTypeTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityTypeTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Config\Entity\ConfigEntityType
- * @group Config
+ * @group config
  */
 class ConfigEntityTypeTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayModeBaseUnitTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayModeBaseUnitTest.php
index 63c5ae0..ae0644d 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayModeBaseUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayModeBaseUnitTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\entity\EntityDisplayModeBase
- * @group Config
+ * @group config
  */
 class EntityDisplayModeBaseUnitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Config/StorageComparerTest.php b/core/tests/Drupal/Tests/Core/Config/StorageComparerTest.php
index 15962fe..f8da11f 100644
--- a/core/tests/Drupal/Tests/Core/Config/StorageComparerTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/StorageComparerTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Config\StorageComparer
- * @group Config
+ * @group config
  */
 class StorageComparerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Controller/ControllerBaseTest.php b/core/tests/Drupal/Tests/Core/Controller/ControllerBaseTest.php
index 23b3950..b02631e 100644
--- a/core/tests/Drupal/Tests/Core/Controller/ControllerBaseTest.php
+++ b/core/tests/Drupal/Tests/Core/Controller/ControllerBaseTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests that the base controller class.
  *
- * @group Controller
+ * @group controller
  */
 class ControllerBaseTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Controller/ControllerResolverTest.php b/core/tests/Drupal/Tests/Core/Controller/ControllerResolverTest.php
index d245f1c..2e55afe 100644
--- a/core/tests/Drupal/Tests/Core/Controller/ControllerResolverTest.php
+++ b/core/tests/Drupal/Tests/Core/Controller/ControllerResolverTest.php
@@ -20,7 +20,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Controller\ControllerResolver
- * @group Controller
+ * @group controller
  */
 class ControllerResolverTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Controller/ExceptionControllerTest.php b/core/tests/Drupal/Tests/Core/Controller/ExceptionControllerTest.php
index 7307780..99eddee 100644
--- a/core/tests/Drupal/Tests/Core/Controller/ExceptionControllerTest.php
+++ b/core/tests/Drupal/Tests/Core/Controller/ExceptionControllerTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Controller\ExceptionController
- * @group Controller
+ * @group controller
  */
 class ExceptionControllerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Controller/TitleResolverTest.php b/core/tests/Drupal/Tests/Core/Controller/TitleResolverTest.php
index b153d9f..bf4bb2b 100644
--- a/core/tests/Drupal/Tests/Core/Controller/TitleResolverTest.php
+++ b/core/tests/Drupal/Tests/Core/Controller/TitleResolverTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Controller\TitleResolver
- * @group Controller
+ * @group controller
  */
 class TitleResolverTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Database/ConnectionTest.php b/core/tests/Drupal/Tests/Core/Database/ConnectionTest.php
index cba899b..d02074b 100644
--- a/core/tests/Drupal/Tests/Core/Database/ConnectionTest.php
+++ b/core/tests/Drupal/Tests/Core/Database/ConnectionTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests the Connection class.
  *
- * @group Database
+ * @group database
  */
 class ConnectionTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Database/EmptyStatementTest.php b/core/tests/Drupal/Tests/Core/Database/EmptyStatementTest.php
index 693775a..c724ed6 100644
--- a/core/tests/Drupal/Tests/Core/Database/EmptyStatementTest.php
+++ b/core/tests/Drupal/Tests/Core/Database/EmptyStatementTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests the empty pseudo-statement class.
  *
- * @group Database
+ * @group database
  */
 class EmptyStatementTest extends UnitTestCase {
   /**
diff --git a/core/tests/Drupal/Tests/Core/Database/OrderByTest.php b/core/tests/Drupal/Tests/Core/Database/OrderByTest.php
index 7152593..4b7a8a1 100644
--- a/core/tests/Drupal/Tests/Core/Database/OrderByTest.php
+++ b/core/tests/Drupal/Tests/Core/Database/OrderByTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the orderBy() method of select queries.
  *
- * @group Database
+ * @group database
  */
 class OrderByTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Datetime/DateTest.php b/core/tests/Drupal/Tests/Core/Datetime/DateTest.php
index 55a59a1..afeae8f 100644
--- a/core/tests/Drupal/Tests/Core/Datetime/DateTest.php
+++ b/core/tests/Drupal/Tests/Core/Datetime/DateTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Datetime\Date
- * @group Datetime
+ * @group datetime
  */
 class DateTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php
index dd03a1f..53e93ca 100644
--- a/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\DependencyInjection\Compiler\TaggedHandlersPass
- * @group DependencyInjection
+ * @group dependencyinjection
  */
 class TaggedHandlersPassTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerBuilderTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerBuilderTest.php
index 83bae60..18035dc 100644
--- a/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerBuilderTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerBuilderTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\DependencyInjection\ContainerBuilder
- * @group DependencyInjection
+ * @group dependencyinjection
  */
 class ContainerBuilderTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerTest.php
index e892f22..118d287 100644
--- a/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\DependencyInjection\Container
- * @group DependencyInjection
+ * @group dependencyinjection
  */
 class ContainerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/DependencyInjection/DependencySerializationTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/DependencySerializationTest.php
index ad05400..c971bfb 100644
--- a/core/tests/Drupal/Tests/Core/DependencyInjection/DependencySerializationTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/DependencySerializationTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\DependencyInjection\DependencySerializationTrait
- * @group DependencyInjection
+ * @group dependencyinjection
  */
 class DependencySerializationTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Display/DisplayVariantTest.php b/core/tests/Drupal/Tests/Core/Display/DisplayVariantTest.php
index add47b1..4d6d951 100644
--- a/core/tests/Drupal/Tests/Core/Display/DisplayVariantTest.php
+++ b/core/tests/Drupal/Tests/Core/Display/DisplayVariantTest.php
@@ -11,7 +11,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Display\VariantBase
- * @group Display
+ * @group display
  */
 class DisplayVariantTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/DrupalTest.php b/core/tests/Drupal/Tests/Core/DrupalTest.php
index 9e4c4b3..3f38151 100644
--- a/core/tests/Drupal/Tests/Core/DrupalTest.php
+++ b/core/tests/Drupal/Tests/Core/DrupalTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the Drupal class.
  *
- * @group DrupalTest
+ * @group drupaltest
  */
 class DrupalTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Enhancer/ParamConversionEnhancerTest.php b/core/tests/Drupal/Tests/Core/Enhancer/ParamConversionEnhancerTest.php
index bfc089e..e2cde4c 100644
--- a/core/tests/Drupal/Tests/Core/Enhancer/ParamConversionEnhancerTest.php
+++ b/core/tests/Drupal/Tests/Core/Enhancer/ParamConversionEnhancerTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Routing\Enhancer\ParamConversionEnhancer
- * @group Enhancer
+ * @group enhancer
  */
 class ParamConversionEnhancerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php b/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php
index adb8979..e09df54 100644
--- a/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\ContentEntityBase
- * @group Entity
+ * @group entity
  */
 class ContentEntityBaseUnitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/ContentEntityDatabaseStorageTest.php b/core/tests/Drupal/Tests/Core/Entity/ContentEntityDatabaseStorageTest.php
index 960f735..5644dc0 100644
--- a/core/tests/Drupal/Tests/Core/Entity/ContentEntityDatabaseStorageTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/ContentEntityDatabaseStorageTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\ContentEntityDatabaseStorage
- * @group Entity
+ * @group entity
  */
 class ContentEntityDatabaseStorageTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/Controller/EntityViewControllerTest.php b/core/tests/Drupal/Tests/Core/Entity/Controller/EntityViewControllerTest.php
index 6539a2b..33d603a 100644
--- a/core/tests/Drupal/Tests/Core/Entity/Controller/EntityViewControllerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/Controller/EntityViewControllerTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\Controller\EntityViewController
- * @group Entity
+ * @group entity
  */
 class EntityViewControllerTest extends UnitTestCase{
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/Enhancer/EntityRouteEnhancerTest.php b/core/tests/Drupal/Tests/Core/Entity/Enhancer/EntityRouteEnhancerTest.php
index 3727a06..355a893 100644
--- a/core/tests/Drupal/Tests/Core/Entity/Enhancer/EntityRouteEnhancerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/Enhancer/EntityRouteEnhancerTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\Enhancer\EntityRouteEnhancer
- * @group Entity
+ * @group entity
  */
 class EntityRouteEnhancerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityAccessCheckTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityAccessCheckTest.php
index ba5ffcf..e59d728 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityAccessCheckTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityAccessCheckTest.php
@@ -16,7 +16,7 @@
 /**
  * Unit test of entity access checking system.
  *
- * @group Entity
+ * @group entity
  */
 class EntityAccessCheckTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityCreateAccessCheckTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityCreateAccessCheckTest.php
index e195e4c..e35e00a 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityCreateAccessCheckTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityCreateAccessCheckTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\EntityCreateAccessCheck
- * @group Entity
+ * @group entity
  */
 class EntityCreateAccessCheckTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityFormBuilderTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityFormBuilderTest.php
index 0242a44..358f836 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityFormBuilderTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityFormBuilderTest.php
@@ -7,7 +7,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\EntityFormBuilder
- * @group Entity
+ * @group entity
  */
 class EntityFormBuilderTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityListBuilderTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityListBuilderTest.php
index a7e0792..228a792 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityListBuilderTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityListBuilderTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\entity_test\EntityTestListBuilder
- * @group Entity
+ * @group entity
  */
 class EntityListBuilderTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
index 0a7acf4..816d3b3 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
@@ -25,7 +25,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\EntityManager
- * @group Entity
+ * @group entity
  */
 class EntityManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityResolverManagerTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityResolverManagerTest.php
index b070e35..f37f738 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityResolverManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityResolverManagerTest.php
@@ -17,7 +17,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\EntityResolverManager
- * @group Entity
+ * @group entity
  */
 class EntityResolverManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityTypeTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityTypeTest.php
index 046744d..b1a6592 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityTypeTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityTypeTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\EntityType
- * @group Entity
+ * @group entity
  */
 class EntityTypeTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityUnitTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityUnitTest.php
index 0ca1e85..fb3944f 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityUnitTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\Entity
- * @group Entity
+ * @group entity
  */
 class EntityUnitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityUrlTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityUrlTest.php
index 7f6ff8f..3ddde91 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityUrlTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityUrlTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\Entity
- * @group Entity
+ * @group entity
  */
 class EntityUrlTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/FieldDefinitionTest.php b/core/tests/Drupal/Tests/Core/Entity/FieldDefinitionTest.php
index 5368574..471e9ef 100644
--- a/core/tests/Drupal/Tests/Core/Entity/FieldDefinitionTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/FieldDefinitionTest.php
@@ -15,7 +15,7 @@
 /**
  * Unit test for FieldDefinition.
  *
- * @group Entity
+ * @group entity
  */
 class FieldDefinitionTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/KeyValueStore/KeyValueEntityStorageTest.php b/core/tests/Drupal/Tests/Core/Entity/KeyValueStore/KeyValueEntityStorageTest.php
index f3447ba..d595d81 100644
--- a/core/tests/Drupal/Tests/Core/Entity/KeyValueStore/KeyValueEntityStorageTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/KeyValueStore/KeyValueEntityStorageTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\KeyValueStore\KeyValueEntityStorage
- * @group Entity
+ * @group entity
  */
 class KeyValueEntityStorageTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/Schema/ContentEntitySchemaHandlerTest.php b/core/tests/Drupal/Tests/Core/Entity/Schema/ContentEntitySchemaHandlerTest.php
index 83b3509..30858e0 100644
--- a/core/tests/Drupal/Tests/Core/Entity/Schema/ContentEntitySchemaHandlerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/Schema/ContentEntitySchemaHandlerTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\Schema\ContentEntitySchemaHandler
- * @group Entity
+ * @group entity
  */
 class ContentEntitySchemaHandlerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/Sql/DefaultTableMappingTest.php b/core/tests/Drupal/Tests/Core/Entity/Sql/DefaultTableMappingTest.php
index 18802c7..95bc282 100644
--- a/core/tests/Drupal/Tests/Core/Entity/Sql/DefaultTableMappingTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/Sql/DefaultTableMappingTest.php
@@ -11,7 +11,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\Sql\DefaultTableMapping
- * @group Entity
+ * @group entity
  */
 class DefaultTableMappingTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/EventSubscriber/AccessSubscriberTest.php b/core/tests/Drupal/Tests/Core/EventSubscriber/AccessSubscriberTest.php
index 11f3565..70b423d 100644
--- a/core/tests/Drupal/Tests/Core/EventSubscriber/AccessSubscriberTest.php
+++ b/core/tests/Drupal/Tests/Core/EventSubscriber/AccessSubscriberTest.php
@@ -21,7 +21,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\EventSubscriber\AccessSubscriber
- * @group EventSubscriber
+ * @group eventsubscriber
  */
 class AccessSubscriberTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/EventSubscriber/ExceptionListenerTest.php b/core/tests/Drupal/Tests/Core/EventSubscriber/ExceptionListenerTest.php
index 5815ee1..8583915 100644
--- a/core/tests/Drupal/Tests/Core/EventSubscriber/ExceptionListenerTest.php
+++ b/core/tests/Drupal/Tests/Core/EventSubscriber/ExceptionListenerTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\EventSubscriber\ExceptionListener
- * @group EventSubscriber
+ * @group eventsubscriber
  */
 class ExceptionListenerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/EventSubscriber/ModuleRouteSubscriberTest.php b/core/tests/Drupal/Tests/Core/EventSubscriber/ModuleRouteSubscriberTest.php
index 57607a8..c4fc472 100644
--- a/core/tests/Drupal/Tests/Core/EventSubscriber/ModuleRouteSubscriberTest.php
+++ b/core/tests/Drupal/Tests/Core/EventSubscriber/ModuleRouteSubscriberTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\EventSubscriber\ModuleRouteSubscriber
- * @group EventSubscriber
+ * @group eventsubscriber
  */
 class ModuleRouteSubscriberTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/EventSubscriber/PathRootsSubscriberTest.php b/core/tests/Drupal/Tests/Core/EventSubscriber/PathRootsSubscriberTest.php
index 02acb66..62091aa 100644
--- a/core/tests/Drupal/Tests/Core/EventSubscriber/PathRootsSubscriberTest.php
+++ b/core/tests/Drupal/Tests/Core/EventSubscriber/PathRootsSubscriberTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\EventSubscriber\PathRootsSubscriber
- * @group EventSubscriber
+ * @group eventsubscriber
  */
 class PathRootsSubscriberTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/EventSubscriber/RedirectResponseSubscriberTest.php b/core/tests/Drupal/Tests/Core/EventSubscriber/RedirectResponseSubscriberTest.php
index 04f7ecf..65f820f 100644
--- a/core/tests/Drupal/Tests/Core/EventSubscriber/RedirectResponseSubscriberTest.php
+++ b/core/tests/Drupal/Tests/Core/EventSubscriber/RedirectResponseSubscriberTest.php
@@ -18,7 +18,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\EventSubscriber\RedirectResponseSubscriber
- * @group EventSubscriber
+ * @group eventsubscriber
  */
 class RedirectResponseSubscriberTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/EventSubscriber/ReverseProxySubscriberUnitTest.php b/core/tests/Drupal/Tests/Core/EventSubscriber/ReverseProxySubscriberUnitTest.php
index 2b19788..0cd0fd0 100644
--- a/core/tests/Drupal/Tests/Core/EventSubscriber/ReverseProxySubscriberUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/EventSubscriber/ReverseProxySubscriberUnitTest.php
@@ -15,7 +15,7 @@
 /**
  * Unit test the reverse proxy event subscriber.
  *
- * @group EventSubscriber
+ * @group eventsubscriber
  */
 class ReverseProxySubscriberUnitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/EventSubscriber/SpecialAttributesRouteSubscriberTest.php b/core/tests/Drupal/Tests/Core/EventSubscriber/SpecialAttributesRouteSubscriberTest.php
index cdab44f..28cae64 100644
--- a/core/tests/Drupal/Tests/Core/EventSubscriber/SpecialAttributesRouteSubscriberTest.php
+++ b/core/tests/Drupal/Tests/Core/EventSubscriber/SpecialAttributesRouteSubscriberTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\EventSubscriber\SpecialAttributesRouteSubscriber
- * @group EventSubscriber
+ * @group eventsubscriber
  */
 class SpecialAttributesRouteSubscriberTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Extension/ModuleHandlerTest.php b/core/tests/Drupal/Tests/Core/Extension/ModuleHandlerTest.php
index bc5da97..a4ce70b 100644
--- a/core/tests/Drupal/Tests/Core/Extension/ModuleHandlerTest.php
+++ b/core/tests/Drupal/Tests/Core/Extension/ModuleHandlerTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Extension\ModuleHandler
- * @group Extension
+ * @group extension
  */
 class ModuleHandlerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php b/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
index 4e6e06b..7955a80 100644
--- a/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
+++ b/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
@@ -17,7 +17,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Extension\ThemeHandler
- * @group Extension
+ * @group extension
  */
 class ThemeHandlerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/ExternalUrlTest.php b/core/tests/Drupal/Tests/Core/ExternalUrlTest.php
index ce0fb84..8a260b3 100644
--- a/core/tests/Drupal/Tests/Core/ExternalUrlTest.php
+++ b/core/tests/Drupal/Tests/Core/ExternalUrlTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Url
- * @group ExternalUrlTest
+ * @group externalurltest
  */
 class ExternalUrlTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Form/ConfirmFormHelperTest.php b/core/tests/Drupal/Tests/Core/Form/ConfirmFormHelperTest.php
index 06a4802..30610df 100644
--- a/core/tests/Drupal/Tests/Core/Form/ConfirmFormHelperTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/ConfirmFormHelperTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Form\ConfirmFormHelper
- * @group Form
+ * @group form
  */
 class ConfirmFormHelperTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php b/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
index fbef067..0c8b7b9 100644
--- a/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Form\FormBuilder
- * @group Form
+ * @group form
  */
 class FormBuilderTest extends FormTestBase {
 
diff --git a/core/tests/Drupal/Tests/Core/Form/FormSubmitterTest.php b/core/tests/Drupal/Tests/Core/Form/FormSubmitterTest.php
index cc34f74..9991048 100644
--- a/core/tests/Drupal/Tests/Core/Form/FormSubmitterTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormSubmitterTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Form\FormSubmitter
- * @group Form
+ * @group form
  */
 class FormSubmitterTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php b/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php
index 0870788..fdb11d0 100644
--- a/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Form\FormValidator
- * @group Form
+ * @group form
  */
 class FormValidatorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Form/OptGroupTest.php b/core/tests/Drupal/Tests/Core/Form/OptGroupTest.php
index 6f353b9..c4fe846 100644
--- a/core/tests/Drupal/Tests/Core/Form/OptGroupTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/OptGroupTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Form\OptGroup
- * @group Form
+ * @group form
  */
 class OptGroupTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/HttpKernelTest.php b/core/tests/Drupal/Tests/Core/HttpKernelTest.php
index 4e5509c..e0e23ca 100644
--- a/core/tests/Drupal/Tests/Core/HttpKernelTest.php
+++ b/core/tests/Drupal/Tests/Core/HttpKernelTest.php
@@ -20,7 +20,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\HttpKernel
- * @group HttpKernelTest
+ * @group httpkerneltest
  */
 class HttpKernelTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Image/ImageTest.php b/core/tests/Drupal/Tests/Core/Image/ImageTest.php
index 94ee5d4..db8b969 100644
--- a/core/tests/Drupal/Tests/Core/Image/ImageTest.php
+++ b/core/tests/Drupal/Tests/Core/Image/ImageTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the image class.
  *
- * @group Image
+ * @group image
  */
 class ImageTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php b/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php
index 7abed94..d5f6133 100644
--- a/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Language\Language
- * @group Language
+ * @group language
  */
 class LanguageUnitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Lock/LockBackendAbstractTest.php b/core/tests/Drupal/Tests/Core/Lock/LockBackendAbstractTest.php
index d044ef4..9597a44 100644
--- a/core/tests/Drupal/Tests/Core/Lock/LockBackendAbstractTest.php
+++ b/core/tests/Drupal/Tests/Core/Lock/LockBackendAbstractTest.php
@@ -11,7 +11,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Tests\Core\Lock\LockBackendAbstractTest
- * @group Lock
+ * @group lock
  */
 class LockBackendAbstractTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Logger/LogMessageParserTest.php b/core/tests/Drupal/Tests/Core/Logger/LogMessageParserTest.php
index 2ef2d08..0193dbd 100644
--- a/core/tests/Drupal/Tests/Core/Logger/LogMessageParserTest.php
+++ b/core/tests/Drupal/Tests/Core/Logger/LogMessageParserTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Logger\LogMessageParser
- * @group Logger
+ * @group logger
  */
 class LogMessageParserTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Logger/LoggerChannelFactoryTest.php b/core/tests/Drupal/Tests/Core/Logger/LoggerChannelFactoryTest.php
index 9f78641..847589b 100644
--- a/core/tests/Drupal/Tests/Core/Logger/LoggerChannelFactoryTest.php
+++ b/core/tests/Drupal/Tests/Core/Logger/LoggerChannelFactoryTest.php
@@ -32,7 +32,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Logger\LoggerChannelFactory
- * @group Logger
+ * @group logger
  */
 class LoggerChannelFactoryTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Logger/LoggerChannelTest.php b/core/tests/Drupal/Tests/Core/Logger/LoggerChannelTest.php
index 00360c2..ce940b0 100644
--- a/core/tests/Drupal/Tests/Core/Logger/LoggerChannelTest.php
+++ b/core/tests/Drupal/Tests/Core/Logger/LoggerChannelTest.php
@@ -32,7 +32,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Logger\LoggerChannel
- * @group Logger
+ * @group logger
  */
 class LoggerChannelTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Mail/MailManagerTest.php b/core/tests/Drupal/Tests/Core/Mail/MailManagerTest.php
index b40db1d..e3a804a 100644
--- a/core/tests/Drupal/Tests/Core/Mail/MailManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Mail/MailManagerTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Mail\MailManager
- * @group Mail
+ * @group mail
  */
 class MailManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Menu/ContextualLinkDefaultTest.php b/core/tests/Drupal/Tests/Core/Menu/ContextualLinkDefaultTest.php
index 24e58c0..6c0aebb 100644
--- a/core/tests/Drupal/Tests/Core/Menu/ContextualLinkDefaultTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/ContextualLinkDefaultTest.php
@@ -15,7 +15,7 @@
 /**
  * Tests the contextual link default class.
  *
- * @group Menu
+ * @group menu
  */
 class ContextualLinkDefaultTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Menu/ContextualLinkManagerTest.php b/core/tests/Drupal/Tests/Core/Menu/ContextualLinkManagerTest.php
index 0858c14..87a9bc3 100644
--- a/core/tests/Drupal/Tests/Core/Menu/ContextualLinkManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/ContextualLinkManagerTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Menu\ContextualLinkManager
- * @group Menu
+ * @group menu
  */
 class ContextualLinkManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Menu/LocalActionDefaultTest.php b/core/tests/Drupal/Tests/Core/Menu/LocalActionDefaultTest.php
index dade254..0defb77 100644
--- a/core/tests/Drupal/Tests/Core/Menu/LocalActionDefaultTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/LocalActionDefaultTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Menu\LocalActionDefault
- * @group Menu
+ * @group menu
  */
 class LocalActionDefaultTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Menu/LocalActionManagerTest.php b/core/tests/Drupal/Tests/Core/Menu/LocalActionManagerTest.php
index 0f67a1d..fcca7bf 100644
--- a/core/tests/Drupal/Tests/Core/Menu/LocalActionManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/LocalActionManagerTest.php
@@ -23,7 +23,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Menu\LocalActionManager
- * @group Menu
+ * @group menu
  */
 class LocalActionManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Menu/LocalTaskDefaultTest.php b/core/tests/Drupal/Tests/Core/Menu/LocalTaskDefaultTest.php
index 530b8a1..d13116a 100644
--- a/core/tests/Drupal/Tests/Core/Menu/LocalTaskDefaultTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/LocalTaskDefaultTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Menu\LocalTaskDefaultTest
- * @group Menu
+ * @group menu
  */
 class LocalTaskDefaultTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php b/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php
index 5966e51..d720a0d 100644
--- a/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Menu\LocalTaskManager
- * @group Menu
+ * @group menu
  */
 class LocalTaskManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Page/HtmlPageTest.php b/core/tests/Drupal/Tests/Core/Page/HtmlPageTest.php
index f2305db..08a977c 100644
--- a/core/tests/Drupal/Tests/Core/Page/HtmlPageTest.php
+++ b/core/tests/Drupal/Tests/Core/Page/HtmlPageTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Page\HtmlPage
- * @group Page
+ * @group page
  */
 class HtmlPageTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/ParamConverter/ParamConverterManagerTest.php b/core/tests/Drupal/Tests/Core/ParamConverter/ParamConverterManagerTest.php
index df308fd..e8d4fa7 100644
--- a/core/tests/Drupal/Tests/Core/ParamConverter/ParamConverterManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/ParamConverter/ParamConverterManagerTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\ParamConverter\ParamConverterManager
- * @group ParamConverter
+ * @group paramconverter
  */
 class ParamConverterManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Path/AliasManagerTest.php b/core/tests/Drupal/Tests/Core/Path/AliasManagerTest.php
index eeaa60b..79d0c7c 100644
--- a/core/tests/Drupal/Tests/Core/Path/AliasManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Path/AliasManagerTest.php
@@ -18,7 +18,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Path\AliasManager
- * @group Path
+ * @group path
  */
 class AliasManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Path/PathMatcherTest.php b/core/tests/Drupal/Tests/Core/Path/PathMatcherTest.php
index 91e80eb..105db2a 100644
--- a/core/tests/Drupal/Tests/Core/Path/PathMatcherTest.php
+++ b/core/tests/Drupal/Tests/Core/Path/PathMatcherTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Path\PathMatcher
- * @group Path
+ * @group path
  */
 class PathMatcherTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorAliasTest.php b/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorAliasTest.php
index de652c0..aee9c64 100644
--- a/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorAliasTest.php
+++ b/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorAliasTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\PathProcessor\PathProcessorAlias
- * @group PathProcessor
+ * @group pathprocessor
  */
 class PathProcessorAliasTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php b/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php
index 776a54a..e4014f0 100644
--- a/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php
+++ b/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php
@@ -22,7 +22,7 @@
 /**
  * Tests processing of the inbound path.
  *
- * @group PathProcessor
+ * @group pathprocessor
  */
 class PathProcessorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Plugin/ConfigurablePluginBagTest.php b/core/tests/Drupal/Tests/Core/Plugin/ConfigurablePluginBagTest.php
index 7d38dd3..593e316 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/ConfigurablePluginBagTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/ConfigurablePluginBagTest.php
@@ -11,7 +11,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Component\Plugin\ConfigurablePluginInterface
- * @group Plugin
+ * @group plugin
  */
 class ConfigurablePluginBagTest extends PluginBagTestBase {
 
diff --git a/core/tests/Drupal/Tests/Core/Plugin/ContextHandlerTest.php b/core/tests/Drupal/Tests/Core/Plugin/ContextHandlerTest.php
index f465019..b39309e 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/ContextHandlerTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/ContextHandlerTest.php
@@ -17,7 +17,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Plugin\Context\ContextHandler
- * @group Plugin
+ * @group plugin
  */
 class ContextHandlerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginBagTest.php b/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginBagTest.php
index 2ac14f6..694d91f 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginBagTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginBagTest.php
@@ -9,7 +9,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Plugin\DefaultPluginBag
- * @group Plugin
+ * @group plugin
  */
 class DefaultPluginBagTest extends PluginBagTestBase {
 
diff --git a/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php b/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php
index 99e4d4a..1993e1a 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php
@@ -12,7 +12,7 @@
 /**
  * Tests the DefaultPluginManager.
  *
- * @group Plugin
+ * @group plugin
  */
 class DefaultPluginManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Plugin/DefaultSinglePluginBagTest.php b/core/tests/Drupal/Tests/Core/Plugin/DefaultSinglePluginBagTest.php
index aa46c61..0e7ebd7 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/DefaultSinglePluginBagTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/DefaultSinglePluginBagTest.php
@@ -11,7 +11,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Plugin\DefaultSinglePluginBag
- * @group Plugin
+ * @group plugin
  */
 class DefaultSinglePluginBagTest extends PluginBagTestBase {
 
diff --git a/core/tests/Drupal/Tests/Core/Plugin/Discovery/ContainerDerivativeDiscoveryDecoratorTest.php b/core/tests/Drupal/Tests/Core/Plugin/Discovery/ContainerDerivativeDiscoveryDecoratorTest.php
index 2164ae9..1535d9b 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/Discovery/ContainerDerivativeDiscoveryDecoratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/Discovery/ContainerDerivativeDiscoveryDecoratorTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests the container aware derivative discovery decorator.
  *
- * @group Plugin
+ * @group plugin
  */
 class ContainerDerivativeDiscoveryDecoratorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Plugin/Discovery/DerivativeDiscoveryDecoratorTest.php b/core/tests/Drupal/Tests/Core/Plugin/Discovery/DerivativeDiscoveryDecoratorTest.php
index e54a5ea..0cf9864 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/Discovery/DerivativeDiscoveryDecoratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/Discovery/DerivativeDiscoveryDecoratorTest.php
@@ -14,7 +14,7 @@
 /**
  * Unit tests for the derivative discovery decorator.
  *
- * @group Plugin
+ * @group plugin
  */
 class DerivativeDiscoveryDecoratorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Plugin/Discovery/HookDiscoveryTest.php b/core/tests/Drupal/Tests/Core/Plugin/Discovery/HookDiscoveryTest.php
index 650ea95..4dcfe63 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/Discovery/HookDiscoveryTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/Discovery/HookDiscoveryTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Plugin\Discovery\HookDiscovery
- * @group Plugin
+ * @group plugin
  */
 class HookDiscoveryTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryDecoratorTest.php b/core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryDecoratorTest.php
index 41b8d41..fe405d0 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryDecoratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryDecoratorTest.php
@@ -13,7 +13,7 @@
 /**
  * YamlDiscoveryDecorator unit tests.
  *
- * @group Plugin
+ * @group plugin
  */
 class YamlDiscoveryDecoratorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryTest.php b/core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryTest.php
index 7512867..567f96f 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Plugin\Discovery\YamlDiscovery
- * @group Plugin
+ * @group plugin
  */
 class YamlDiscoveryTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/PrivateKeyTest.php b/core/tests/Drupal/Tests/Core/PrivateKeyTest.php
index 3762e94..7584c63 100644
--- a/core/tests/Drupal/Tests/Core/PrivateKeyTest.php
+++ b/core/tests/Drupal/Tests/Core/PrivateKeyTest.php
@@ -14,7 +14,7 @@
 /**
  * Tests the PrivateKey class.
  *
- * @group PrivateKeyTest
+ * @group privatekeytest
  */
 class PrivateKeyTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Render/ElementInfoTest.php b/core/tests/Drupal/Tests/Core/Render/ElementInfoTest.php
index 86878f4..25d0716 100644
--- a/core/tests/Drupal/Tests/Core/Render/ElementInfoTest.php
+++ b/core/tests/Drupal/Tests/Core/Render/ElementInfoTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Render\ElementInfo
- * @group Render
+ * @group render
  */
 class ElementInfoTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Render/ElementTest.php b/core/tests/Drupal/Tests/Core/Render/ElementTest.php
index 20ac844..2209485 100644
--- a/core/tests/Drupal/Tests/Core/Render/ElementTest.php
+++ b/core/tests/Drupal/Tests/Core/Render/ElementTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Render\Element
- * @group Render
+ * @group render
  */
 class ElementTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Route/RoleAccessCheckTest.php b/core/tests/Drupal/Tests/Core/Route/RoleAccessCheckTest.php
index 232645b..c17fb89 100644
--- a/core/tests/Drupal/Tests/Core/Route/RoleAccessCheckTest.php
+++ b/core/tests/Drupal/Tests/Core/Route/RoleAccessCheckTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\user\Access\RoleAccessCheck
- * @group Route
+ * @group route
  */
 class RoleAccessCheckTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/RouteProcessor/RouteProcessorManagerTest.php b/core/tests/Drupal/Tests/Core/RouteProcessor/RouteProcessorManagerTest.php
index 4e18380..c0d11cc 100644
--- a/core/tests/Drupal/Tests/Core/RouteProcessor/RouteProcessorManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/RouteProcessor/RouteProcessorManagerTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\RouteProcessor\RouteProcessorManager
- * @group RouteProcessor
+ * @group routeprocessor
  */
 class RouteProcessorManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Routing/AcceptHeaderMatcherTest.php b/core/tests/Drupal/Tests/Core/Routing/AcceptHeaderMatcherTest.php
index 22ffa8f..d3d4e44 100644
--- a/core/tests/Drupal/Tests/Core/Routing/AcceptHeaderMatcherTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/AcceptHeaderMatcherTest.php
@@ -16,7 +16,7 @@
 /**
  * Confirm that the mime types partial matcher is functioning properly.
  *
- * @group Routing
+ * @group routing
  */
 class AcceptHeaderMatcherTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Routing/ContentTypeHeaderMatcherTest.php b/core/tests/Drupal/Tests/Core/Routing/ContentTypeHeaderMatcherTest.php
index 17b7e14..0fff0a5 100644
--- a/core/tests/Drupal/Tests/Core/Routing/ContentTypeHeaderMatcherTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/ContentTypeHeaderMatcherTest.php
@@ -15,7 +15,7 @@
 /**
  * Confirm that the content types partial matcher is functioning properly.
  *
- * @group Routing
+ * @group routing
  */
 class ContentTypeHeaderMatcherTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Routing/CurrentRouteMatchTest.php b/core/tests/Drupal/Tests/Core/Routing/CurrentRouteMatchTest.php
index 3293b84..3c363a2 100644
--- a/core/tests/Drupal/Tests/Core/Routing/CurrentRouteMatchTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/CurrentRouteMatchTest.php
@@ -18,7 +18,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Routing\CurrentRouteMatch
- * @group Routing
+ * @group routing
  */
 class CurrentRouteMatchTest extends RouteMatchBaseTest {
 
diff --git a/core/tests/Drupal/Tests/Core/Routing/LazyLoadingRouteCollectionTest.php b/core/tests/Drupal/Tests/Core/Routing/LazyLoadingRouteCollectionTest.php
index 46f5995..7600bcd 100644
--- a/core/tests/Drupal/Tests/Core/Routing/LazyLoadingRouteCollectionTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/LazyLoadingRouteCollectionTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Routing\LazyLoadingRouteCollection
- * @group Routing
+ * @group routing
  */
 class LazyLoadingRouteCollectionTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Routing/RouteBuilderTest.php b/core/tests/Drupal/Tests/Core/Routing/RouteBuilderTest.php
index aff9896..cb5a7a5 100644
--- a/core/tests/Drupal/Tests/Core/Routing/RouteBuilderTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/RouteBuilderTest.php
@@ -18,7 +18,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Routing\RouteBuilder
- * @group Routing
+ * @group routing
  */
 class RouteBuilderTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Routing/RouteCompilerTest.php b/core/tests/Drupal/Tests/Core/Routing/RouteCompilerTest.php
index 4d1977c..4846d8f 100644
--- a/core/tests/Drupal/Tests/Core/Routing/RouteCompilerTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/RouteCompilerTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Routing\RouteCompiler
- * @group Routing
+ * @group routing
  */
 class RouteCompilerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Routing/RouteMatchTest.php b/core/tests/Drupal/Tests/Core/Routing/RouteMatchTest.php
index 6aab6f4..cad6a11 100644
--- a/core/tests/Drupal/Tests/Core/Routing/RouteMatchTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/RouteMatchTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Routing\RouteMatch
- * @group Routing
+ * @group routing
  */
 class RouteMatchTest extends RouteMatchBaseTest {
 
diff --git a/core/tests/Drupal/Tests/Core/Routing/RoutePreloaderTest.php b/core/tests/Drupal/Tests/Core/Routing/RoutePreloaderTest.php
index a928c97..3796fe8 100644
--- a/core/tests/Drupal/Tests/Core/Routing/RoutePreloaderTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/RoutePreloaderTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Routing\RoutePreloader
- * @group Routing
+ * @group routing
  */
 class RoutePreloaderTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Routing/UrlGeneratorTest.php b/core/tests/Drupal/Tests/Core/Routing/UrlGeneratorTest.php
index bd56fa2..cfb7abd 100644
--- a/core/tests/Drupal/Tests/Core/Routing/UrlGeneratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/UrlGeneratorTest.php
@@ -20,7 +20,7 @@
 /**
  * Confirm that the UrlGenerator is functioning properly.
  *
- * @group Routing
+ * @group routing
  */
 class UrlGeneratorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Session/AnonymousUserSessionTest.php b/core/tests/Drupal/Tests/Core/Session/AnonymousUserSessionTest.php
index e918fa4..ef19ae4 100644
--- a/core/tests/Drupal/Tests/Core/Session/AnonymousUserSessionTest.php
+++ b/core/tests/Drupal/Tests/Core/Session/AnonymousUserSessionTest.php
@@ -15,7 +15,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Session\AnonymousUserSession
- * @group Session
+ * @group session
  */
 class AnonymousUserSessionTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Session/UserSessionTest.php b/core/tests/Drupal/Tests/Core/Session/UserSessionTest.php
index 7d61060..2f49628 100644
--- a/core/tests/Drupal/Tests/Core/Session/UserSessionTest.php
+++ b/core/tests/Drupal/Tests/Core/Session/UserSessionTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Session\UserSession
- * @group Session
+ * @group session
  */
 class UserSessionTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Site/SettingsTest.php b/core/tests/Drupal/Tests/Core/Site/SettingsTest.php
index 5a442b8..822dbe7 100644
--- a/core/tests/Drupal/Tests/Core/Site/SettingsTest.php
+++ b/core/tests/Drupal/Tests/Core/Site/SettingsTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Site\Settings
- * @group Site
+ * @group site
  */
 class SettingsTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/StringTranslation/StringTranslationTraitTest.php b/core/tests/Drupal/Tests/Core/StringTranslation/StringTranslationTraitTest.php
index 044c5eb..a9dd5f3 100644
--- a/core/tests/Drupal/Tests/Core/StringTranslation/StringTranslationTraitTest.php
+++ b/core/tests/Drupal/Tests/Core/StringTranslation/StringTranslationTraitTest.php
@@ -11,7 +11,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\StringTranslation\StringTranslationTrait
- * @group StringTranslation
+ * @group stringtranslation
  */
 class StringTranslationTraitTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/StringTranslation/TranslationManagerTest.php b/core/tests/Drupal/Tests/Core/StringTranslation/TranslationManagerTest.php
index 7f2859c..7c456df 100644
--- a/core/tests/Drupal/Tests/Core/StringTranslation/TranslationManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/StringTranslation/TranslationManagerTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\StringTranslation\TranslationManager
- * @group StringTranslation
+ * @group stringtranslation
  */
 class TranslationManagerTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Template/AttributeTest.php b/core/tests/Drupal/Tests/Core/Template/AttributeTest.php
index aee1dd7..7d68003 100644
--- a/core/tests/Drupal/Tests/Core/Template/AttributeTest.php
+++ b/core/tests/Drupal/Tests/Core/Template/AttributeTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Template\Attribute
- * @group Template
+ * @group template
  */
 class AttributeTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php b/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
index fe42e81..6088e78 100644
--- a/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
+++ b/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Theme\Registry
- * @group Theme
+ * @group theme
  */
 class RegistryTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Theme/ThemeNegotiatorTest.php b/core/tests/Drupal/Tests/Core/Theme/ThemeNegotiatorTest.php
index 91f3a61..68ff50e 100644
--- a/core/tests/Drupal/Tests/Core/Theme/ThemeNegotiatorTest.php
+++ b/core/tests/Drupal/Tests/Core/Theme/ThemeNegotiatorTest.php
@@ -16,7 +16,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Theme\ThemeNegotiator
- * @group Theme
+ * @group theme
  */
 class ThemeNegotiatorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/UrlTest.php b/core/tests/Drupal/Tests/Core/UrlTest.php
index 324f9e9..7a80197 100644
--- a/core/tests/Drupal/Tests/Core/UrlTest.php
+++ b/core/tests/Drupal/Tests/Core/UrlTest.php
@@ -17,7 +17,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Url
- * @group UrlTest
+ * @group urltest
  */
 class UrlTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Utility/ColorTest.php b/core/tests/Drupal/Tests/Core/Utility/ColorTest.php
index e54d445..7182f4e 100644
--- a/core/tests/Drupal/Tests/Core/Utility/ColorTest.php
+++ b/core/tests/Drupal/Tests/Core/Utility/ColorTest.php
@@ -13,7 +13,7 @@
 /**
  * Tests Color utility class conversions.
  *
- * @group Utility
+ * @group utility
  */
 class ColorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Utility/ErrorTest.php b/core/tests/Drupal/Tests/Core/Utility/ErrorTest.php
index f7f6e9f..2fc6793 100644
--- a/core/tests/Drupal/Tests/Core/Utility/ErrorTest.php
+++ b/core/tests/Drupal/Tests/Core/Utility/ErrorTest.php
@@ -12,7 +12,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Utility\Error
- * @group Utility
+ * @group utility
  */
 class ErrorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Utility/LinkGeneratorTest.php b/core/tests/Drupal/Tests/Core/Utility/LinkGeneratorTest.php
index 7926b2f..682486f 100644
--- a/core/tests/Drupal/Tests/Core/Utility/LinkGeneratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Utility/LinkGeneratorTest.php
@@ -14,7 +14,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Utility\LinkGenerator
- * @group Utility
+ * @group utility
  */
 class LinkGeneratorTest extends UnitTestCase {
 
diff --git a/core/tests/Drupal/Tests/Core/Utility/TokenTest.php b/core/tests/Drupal/Tests/Core/Utility/TokenTest.php
index f7c3377..b77b810 100644
--- a/core/tests/Drupal/Tests/Core/Utility/TokenTest.php
+++ b/core/tests/Drupal/Tests/Core/Utility/TokenTest.php
@@ -13,7 +13,7 @@
 
 /**
  * @coversDefaultClass \Drupal\Core\Utility\Token
- * @group Utility
+ * @group utility
  */
 class TokenTest extends UnitTestCase {