diff --git a/core/modules/field/src/Tests/DisplayApiTest.php b/core/modules/field/src/Tests/DisplayApiTest.php
index 4123ab3..513de0b 100644
--- a/core/modules/field/src/Tests/DisplayApiTest.php
+++ b/core/modules/field/src/Tests/DisplayApiTest.php
@@ -17,6 +17,15 @@
 class DisplayApiTest extends FieldUnitTestBase {
 
   /**
+   * Set to TRUE to strict check all configuration saved.
+   *
+   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
+   *
+   * @var bool
+   */
+  protected $strictConfigSchema = TRUE;
+
+  /**
    * The field name to use in this test.
    *
    * @var string
diff --git a/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php b/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php
index 939cfc4..1880818 100644
--- a/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php
+++ b/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php
@@ -19,6 +19,15 @@
 class FieldImportDeleteUninstallUiTest extends FieldTestBase {
 
   /**
+   * Set to TRUE to strict check all configuration saved.
+   *
+   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
+   *
+   * @var bool
+   */
+  protected $strictConfigSchema = TRUE;
+
+  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/field/src/Tests/ShapeItemTest.php b/core/modules/field/src/Tests/ShapeItemTest.php
index 548d63e..05c1606 100644
--- a/core/modules/field/src/Tests/ShapeItemTest.php
+++ b/core/modules/field/src/Tests/ShapeItemTest.php
@@ -18,6 +18,15 @@
 class ShapeItemTest extends FieldUnitTestBase {
 
   /**
+   * Set to TRUE to strict check all configuration saved.
+   *
+   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
+   *
+   * @var bool
+   */
+  protected $strictConfigSchema = TRUE;
+
+  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/field/src/Tests/TestItemWithDependenciesTest.php b/core/modules/field/src/Tests/TestItemWithDependenciesTest.php
index b5ad7e1..684cc0f 100644
--- a/core/modules/field/src/Tests/TestItemWithDependenciesTest.php
+++ b/core/modules/field/src/Tests/TestItemWithDependenciesTest.php
@@ -15,6 +15,15 @@
 class TestItemWithDependenciesTest extends FieldUnitTestBase {
 
   /**
+   * Set to TRUE to strict check all configuration saved.
+   *
+   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
+   *
+   * @var bool
+   */
+  protected $strictConfigSchema = TRUE;
+
+  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/field/tests/modules/field_plugins_test/config/schema/field_plugins_test.schema.yml b/core/modules/field/tests/modules/field_plugins_test/config/schema/field_plugins_test.schema.yml
new file mode 100644
index 0000000..a7d58c0
--- /dev/null
+++ b/core/modules/field/tests/modules/field_plugins_test/config/schema/field_plugins_test.schema.yml
@@ -0,0 +1,7 @@
+field.formatter.settings.field_plugins_test_text_formatter:
+  type: field.formatter.settings.text_trimmed
+  label: 'Test text formatter display format settings'
+
+field.widget.settings.field_plugins_test_text_widget:
+  type: field.widget.settings.text_textfield
+  label: 'Test text field widget settings'
diff --git a/core/modules/field/tests/modules/field_test/config/schema/field_test.schema.yml b/core/modules/field/tests/modules/field_test/config/schema/field_test.schema.yml
index 01b3aa6..0ff333e 100644
--- a/core/modules/field/tests/modules/field_test/config/schema/field_test.schema.yml
+++ b/core/modules/field/tests/modules/field_test/config/schema/field_test.schema.yml
@@ -1,6 +1,14 @@
+field.formatter.settings.field_test_default:
+  type: mapping
+  label: 'Field test default display format settings'
+  mapping:
+    test_formatter_setting:
+      type: string
+      label: 'Test setting'
+
 field.formatter.settings.field_test_multiple:
   type: mapping
-  label: 'field_test display format settings'
+  label: 'Multiple field test display format settings'
   mapping:
     test_formatter_setting_multiple:
       type: string
@@ -9,9 +17,33 @@ field.formatter.settings.field_test_multiple:
       type: boolean
       label: 'Test altering'
 
+field.formatter.settings.field_empty_setting:
+  type: mapping
+  label: 'Empty setting field display format settings'
+  mapping:
+    field_empty_setting:
+      type: string
+      label: 'Test setting'
+
+field.formatter.settings.field_test_with_prepare_view:
+  type: mapping
+  label: 'Field prepare step display format settings'
+  mapping:
+    test_formatter_setting_additional:
+      type: string
+      label: 'Test setting'
+
+field.widget.settings.test_field_widget:
+  type: mapping
+  label: 'Test field widget settings'
+  mapping:
+    test_widget_setting:
+      type: string
+      label: 'Test setting'
+
 field.widget.settings.test_field_widget_multiple:
   type: mapping
-  label: 'field_test display format settings'
+  label: 'Test multiple field widget settings'
   mapping:
     test_widget_setting_multiple:
       type: string
@@ -19,7 +51,7 @@ field.widget.settings.test_field_widget_multiple:
 
 field.storage_settings.test_field:
   type: mapping
-  label: 'Test field settings'
+  label: 'Test field storage settings'
   mapping:
     test_field_storage_setting:
       type: string
@@ -31,14 +63,30 @@ field.storage_settings.test_field:
       type: string
       label: 'An unchangeable field storage setting'
 
+field.storage_settings.test_field_with_dependencies:
+  type: field.storage_settings.test_field
+  label: 'Test field with dependencies storage settings'
+
+field.storage_settings.hidden_test_field:
+  type: field.storage_settings.test_field
+  label: 'Hidden test field storage settings'
+
 field.field_settings.test_field:
   type: mapping
-  label: 'Test field settings'
+  label: 'Test field field settings'
   mapping:
     test_field_setting:
       type: string
       label: 'Test field setting'
 
+field.field_settings.test_field_with_dependencies:
+  type: field.field_settings.test_field
+  label: 'Test field with dependencies field settings'
+
+field.field_settings.hidden_test_field:
+  type: field.field_settings.test_field
+  label: 'Hidden test field field settings'
+
 field.value.test_field:
   type: mapping
   label: 'Default value'
@@ -46,3 +94,11 @@ field.value.test_field:
     value:
       type: label
       label: 'Value'
+
+entity_view_display.third_party.field_test:
+  type: mapping
+  label: 'Field test entity display third party setting'
+  mapping:
+    foo:
+      type: string
+      label: 'Test setting'
diff --git a/core/modules/field_ui/src/Tests/EntityDisplayTest.php b/core/modules/field_ui/src/Tests/EntityDisplayTest.php
index 82003d8..efcd9e0 100644
--- a/core/modules/field_ui/src/Tests/EntityDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/EntityDisplayTest.php
@@ -17,6 +17,15 @@
  */
 class EntityDisplayTest extends KernelTestBase {
 
+  /**
+   * Set to TRUE to strict check all configuration saved.
+   *
+   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
+   *
+   * @var bool
+   */
+  protected $strictConfigSchema = TRUE;
+
   public static $modules = array('field_ui', 'field', 'entity_test', 'user', 'text', 'field_test', 'node', 'system', 'entity_reference');
 
   protected function setUp() {
@@ -48,7 +57,7 @@ public function testEntityDisplayCRUD() {
     $this->assertEqual($display->getComponent('component_2'), $expected['component_2']);
 
     // Check that arbitrary options are correctly stored.
-    $expected['component_3'] = array('weight' => 10, 'foo' => 'bar');
+    $expected['component_3'] = array('weight' => 10, 'third_party_settings' => array('field_test' => array('foo' => 'bar')));
     $display->setComponent('component_3', $expected['component_3']);
     $this->assertEqual($display->getComponent('component_3'), $expected['component_3']);
 
diff --git a/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php b/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php
index 057d575..5ce4e9a 100644
--- a/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php
@@ -17,6 +17,15 @@
  */
 class EntityFormDisplayTest extends KernelTestBase {
 
+  /**
+   * Set to TRUE to strict check all configuration saved.
+   *
+   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
+   *
+   * @var bool
+   */
+  protected $strictConfigSchema = TRUE;
+
   public static $modules = array('field_ui', 'field', 'entity_test', 'field_test', 'user', 'text', 'entity_reference');
 
   protected function setUp() {
diff --git a/core/modules/field_ui/src/Tests/ManageDisplayTest.php b/core/modules/field_ui/src/Tests/ManageDisplayTest.php
index d0edeef..5c8e276 100644
--- a/core/modules/field_ui/src/Tests/ManageDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/ManageDisplayTest.php
@@ -8,7 +8,6 @@
 namespace Drupal\field_ui\Tests;
 
 use Drupal\Component\Utility\Unicode;
-use Drupal\config\Tests\SchemaCheckTestTrait;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\simpletest\WebTestBase;
@@ -20,7 +19,15 @@
  */
 class ManageDisplayTest extends WebTestBase {
 
-  use SchemaCheckTestTrait;
+  /**
+   * Set to TRUE to strict check all configuration saved.
+   *
+   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
+   *
+   * @var bool
+   */
+  protected $strictConfigSchema = TRUE;
+
   use FieldUiTestTrait;
 
   /**
@@ -141,7 +148,6 @@ function testFormatterUI() {
     $display = entity_load('entity_view_display', 'node.' . $this->type . '.default', TRUE);
     $this->assertEqual($display->getRenderer('field_test')->getThirdPartySetting('field_third_party_test', 'field_test_field_formatter_third_party_settings_form'), 'foo');
     $this->assertTrue(in_array('field_third_party_test', $display->calculateDependencies()['module']), 'The display has a dependency on field_third_party_test module.');
-    $this->assertConfigSchema(\Drupal::service('config.typed'), $display->getEntityType()->getConfigPrefix() . '.' . $display->id(), $display->toArray());
 
     // Confirm that the third party settings are not updated on the settings form.
     $this->drupalPostAjaxForm(NULL, array(), "field_test_settings_edit");
@@ -248,7 +254,6 @@ public function testWidgetUI() {
     $display = entity_load('entity_form_display', 'node.' . $this->type . '.default', TRUE);
     $this->assertEqual($display->getRenderer('field_test')->getThirdPartySetting('field_third_party_test', 'field_test_widget_third_party_settings_form'), 'foo');
     $this->assertTrue(in_array('field_third_party_test', $display->calculateDependencies()['module']), 'Form display does not have a dependency on field_third_party_test module.');
-    $this->assertConfigSchema(\Drupal::service('config.typed'), $display->getEntityType()->getConfigPrefix() . '.' . $display->id(), $display->toArray());
 
     // Confirm that the third party settings are not updated on the settings form.
     $this->drupalPostAjaxForm(NULL, array(), "field_test_settings_edit");
diff --git a/core/modules/field_ui/src/Tests/ManageFieldsTest.php b/core/modules/field_ui/src/Tests/ManageFieldsTest.php
index 955034c..44f1949 100644
--- a/core/modules/field_ui/src/Tests/ManageFieldsTest.php
+++ b/core/modules/field_ui/src/Tests/ManageFieldsTest.php
@@ -21,6 +21,15 @@
  */
 class ManageFieldsTest extends WebTestBase {
 
+  /**
+   * Set to TRUE to strict check all configuration saved.
+   *
+   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
+   *
+   * @var bool
+   */
+  protected $strictConfigSchema = TRUE;
+
   use FieldUiTestTrait;
 
   /**
diff --git a/core/modules/link/config/schema/link.schema.yml b/core/modules/link/config/schema/link.schema.yml
index d489174..01a8a65 100644
--- a/core/modules/link/config/schema/link.schema.yml
+++ b/core/modules/link/config/schema/link.schema.yml
@@ -21,18 +21,8 @@ field.formatter.settings.link:
       label: 'Open link in new window'
 
 field.formatter.settings.link_separate:
-  type: mapping
+  type: field.formatter.settings.link
   label: 'Link format settings'
-  mapping:
-    trim_length:
-      type: integer
-      label: 'Trim link text length'
-    rel:
-      type: string
-      label: 'Add rel="nofollow" to links'
-    target:
-      type: string
-      label: 'Open link in new window'
 
 field.widget.settings.link_default:
   type: mapping
diff --git a/core/modules/link/src/Plugin/Field/FieldFormatter/LinkSeparateFormatter.php b/core/modules/link/src/Plugin/Field/FieldFormatter/LinkSeparateFormatter.php
index c88b8ff..3642a1f 100644
--- a/core/modules/link/src/Plugin/Field/FieldFormatter/LinkSeparateFormatter.php
+++ b/core/modules/link/src/Plugin/Field/FieldFormatter/LinkSeparateFormatter.php
@@ -33,7 +33,7 @@ class LinkSeparateFormatter extends LinkFormatter {
    */
   public static function defaultSettings() {
     return array(
-      'trim_length' => '80',
+      'trim_length' => 80,
       'rel' => '',
       'target' => '',
     ) + parent::defaultSettings();
diff --git a/core/modules/link/src/Tests/LinkFieldTest.php b/core/modules/link/src/Tests/LinkFieldTest.php
index 97058f0..685b145 100644
--- a/core/modules/link/src/Tests/LinkFieldTest.php
+++ b/core/modules/link/src/Tests/LinkFieldTest.php
@@ -21,6 +21,15 @@
 class LinkFieldTest extends WebTestBase {
 
   /**
+   * Set to TRUE to strict check all configuration saved.
+   *
+   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
+   *
+   * @var bool
+   */
+  protected $strictConfigSchema = TRUE;
+
+  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/simpletest/src/TestBase.php b/core/modules/simpletest/src/TestBase.php
index a766d63..806281e 100644
--- a/core/modules/simpletest/src/TestBase.php
+++ b/core/modules/simpletest/src/TestBase.php
@@ -209,7 +209,7 @@
    *
    * @var bool
    */
-  protected $strictConfigSchema = FALSE;
+  protected $strictConfigSchema = TRUE;
 
   /**
    * Constructor for Test.
diff --git a/core/modules/system/tests/modules/entity_test/config/schema/entity_test.schema.yml b/core/modules/system/tests/modules/entity_test/config/schema/entity_test.schema.yml
index 85a19e8..5a3ad02 100644
--- a/core/modules/system/tests/modules/entity_test/config/schema/entity_test.schema.yml
+++ b/core/modules/system/tests/modules/entity_test/config/schema/entity_test.schema.yml
@@ -5,3 +5,11 @@ entity_view_display.third_party.entity_test:
     foo:
       type: string
       label: 'Label for foo'
+
+field.storage_settings.shape:
+  type: mapping
+  label: 'Shape field storage settings'
+  mapping:
+    foreign_key_name:
+      type: string
+      label: 'Foreign key name'