diff --git a/core/tests/Drupal/FunctionalTests/SetupDrupalTestScriptTest.php b/core/tests/Drupal/FunctionalTests/SetupDrupalTestScriptTest.php
index 8a7c3267cb..3a0487092c 100644
--- a/core/tests/Drupal/FunctionalTests/SetupDrupalTestScriptTest.php
+++ b/core/tests/Drupal/FunctionalTests/SetupDrupalTestScriptTest.php
@@ -7,7 +7,7 @@
 use Symfony\Component\Process\Process;
 
 /**
- * Tests setup-drupal-test.php
+ * Tests setup-drupal-test.php.
  *
  * @group core
  */
@@ -16,7 +16,7 @@ class SetupDrupalTestScriptTest extends UnitTestCase {
   public function testInstallScript() {
     $php_executable_finder = new PhpExecutableFinder();
     $php = $php_executable_finder->find();
-    
+
     $db_url = getenv('SIMPLETEST_DB');
     $base_url = getenv('SIMPLETEST_BASE_URL');
     $process = new Process("$php {$this->root}/core/scripts/setup-drupal-test.php --db_url={$db_url} --base_url={$base_url}");
diff --git a/core/tests/Drupal/Setup/Commands/TestInstallationSetupApplication.php b/core/tests/Drupal/Setup/Commands/TestInstallationSetupApplication.php
index eaef9c8745..312d3db757 100644
--- a/core/tests/Drupal/Setup/Commands/TestInstallationSetupApplication.php
+++ b/core/tests/Drupal/Setup/Commands/TestInstallationSetupApplication.php
@@ -6,7 +6,8 @@
 use Symfony\Component\Console\Input\InputInterface;
 
 /**
- * Command 
+ * Application wrapper for TestInstallationSetupCommand.
+ *
  * @internal
  */
 class TestInstallationSetupApplication extends Application {
@@ -34,4 +35,5 @@ protected function getDefaultCommands() {
     $default_commands[] = new TestInstallationSetupCommand();
     return $default_commands;
   }
+
 }
diff --git a/core/tests/Drupal/Setup/Commands/TestInstallationSetupCommand.php b/core/tests/Drupal/Setup/Commands/TestInstallationSetupCommand.php
index bb40013222..43704b1723 100644
--- a/core/tests/Drupal/Setup/Commands/TestInstallationSetupCommand.php
+++ b/core/tests/Drupal/Setup/Commands/TestInstallationSetupCommand.php
@@ -39,4 +39,5 @@ protected function execute(InputInterface $input, OutputInterface $output) {
 
     $output->writeln(drupal_generate_test_ua($test->getDatabasePrefix()));
   }
+
 }
diff --git a/core/tests/Drupal/Setup/ExampleTestSetup.php b/core/tests/Drupal/Setup/ExampleTestSetup.php
index 9ee6c2d15d..ed94c18778 100644
--- a/core/tests/Drupal/Setup/ExampleTestSetup.php
+++ b/core/tests/Drupal/Setup/ExampleTestSetup.php
@@ -4,6 +4,9 @@
 
 use Drupal\node\Entity\Node;
 
+/**
+ * Example test setup file.
+ */
 class ExampleTestSetup implements TestSetupInterface {
 
   /**