diff --git a/core/modules/language/config/schema/language.schema.yml b/core/modules/language/config/schema/language.schema.yml
index 5e3f55b..91ce2d1 100644
--- a/core/modules/language/config/schema/language.schema.yml
+++ b/core/modules/language/config/schema/language.schema.yml
@@ -131,3 +131,11 @@ condition.plugin.language:
       type: sequence
       sequence:
         type: string
+
+field.widget.settings.language_select:
+  type: mapping
+  label: 'Language format settings'
+  mapping:
+    include_locked:
+      type: boolean
+      label: 'Include locked languages'
diff --git a/core/modules/language/src/Tests/LanguageSelectWidgetTest.php b/core/modules/language/src/Tests/LanguageSelectWidgetTest.php
deleted file mode 100644
index 7eb4c9d..0000000
--- a/core/modules/language/src/Tests/LanguageSelectWidgetTest.php
+++ /dev/null
@@ -1,134 +0,0 @@
-<?php
-
-namespace Drupal\language\Tests;
-
-use Drupal\entity_test\Entity\EntityTest;
-use Drupal\field\Entity\FieldConfig;
-use Drupal\field\Tests\FieldTestBase;
-use Drupal\field\Entity\FieldStorageConfig;
-use Drupal\Core\Language\LanguageInterface;
-
-/**
- * Tests the Language Select widgets.
- *
- * @group language
- */
-class LanguageSelectWidgetTest extends FieldTestBase {
-
-  /**
-   * Modules to enable.
-   *
-   * @var array
-   */
-  public static $modules = array(
-    'language',
-    'language_test',
-    'node',
-    'entity_test',
-    'field_ui',
-  );
-
-  /**
-   * A field storage with include_locked.
-   *
-   * @var \Drupal\field\Entity\FieldStorageConfig
-   */
-  protected $fieldLanguageLocked;
-
-  /**
-   * A field storage without include_locked.
-   *
-   * @var \Drupal\field\Entity\FieldStorageConfig
-   */
-  protected $fieldLanguageUnlocked;
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    parent::setUp();
-
-    // Install Portuguese, Brazil language.
-    $edit = array();
-    $edit['predefined_langcode'] = 'pt-br';
-
-    $this->drupalPostForm(
-      'admin/config/regional/language/add',
-      $edit,
-      t('Add language')
-    );
-
-    $this->fieldLanguageLocked = FieldStorageConfig::create([
-      'field_name' => 'language_locked',
-      'entity_type' => 'entity_test',
-      'type' => 'language_select',
-      'languages' => LanguageInterface::STATE_ALL,
-    ]);
-
-    $this->fieldLanguageLocked->save();
-
-    $this->fieldLanguageUnlocked = FieldStorageConfig::create([
-      'field_name' => 'language_unlocked',
-      'entity_type' => 'entity_test',
-      'type' => 'language_select',
-      'languages' => LanguageInterface::STATE_CONFIGURABLE,
-    ]);
-
-    $this->fieldLanguageUnlocked->save();
-  }
-
-  /**
-   * Check that default settings with include_locked languages TRUE.
-   */
-  public function testWithIncludedLockedLanguage() {
-
-    // Create an instance of the 'single value' field.
-    $field = FieldConfig::create([
-      'field_storage' => $this->fieldLanguageLocked,
-      'bundle' => 'entity_test',
-    ]);
-
-    $field->save();
-
-    // Create an entity.
-    $entity = EntityTest::create(array(
-      'user_id' => 1,
-      'name' => $this->randomMachineName(),
-    ));
-    $entity->save();
-
-    // Display form.
-    $this->drupalGet('entity_test/manage/' . $entity->id() . '/edit');
-    $this->assertOptionSelected('edit-language-locked', LanguageInterface::LANGCODE_NOT_APPLICABLE);
-    $this->assertOptionSelected('edit-language-locked', LanguageInterface::LANGCODE_NOT_SPECIFIED);
-    $this->assertOptionSelected('edit-language-locked', 'pt-br');
-  }
-
-  /**
-   * Check the settings with include_locked languages FALSE.
-   */
-  public function testWithoutIncludedLockedLanguage() {
-
-    // Create an instance of the 'single value' field.
-    $field = FieldConfig::create([
-      'field_storage' => $this->fieldLanguageUnlocked,
-      'bundle' => 'entity_test',
-    ]);
-
-    $field->save();
-
-    // Create an entity.
-    $entity = EntityTest::create(array(
-      'user_id' => 1,
-      'name' => $this->randomMachineName(),
-    ));
-    $entity->save();
-
-    // Display form.
-    $this->drupalGet('entity_test/manage/' . $entity->id() . '/edit');
-    $this->assertNoOptionSelected('edit-language-locked', LanguageInterface::LANGCODE_NOT_APPLICABLE);
-    $this->assertNoOptionSelected('edit-language-locked', LanguageInterface::LANGCODE_NOT_SPECIFIED);
-    $this->assertOptionSelected('edit-language-locked', 'pt-br');
-  }
-
-}
diff --git a/core/modules/language/tests/src/Kernel/LanguageSelectWidgetTest.php b/core/modules/language/tests/src/Kernel/LanguageSelectWidgetTest.php
new file mode 100644
index 0000000..966275c
--- /dev/null
+++ b/core/modules/language/tests/src/Kernel/LanguageSelectWidgetTest.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Drupal\Tests\language\Kernel;
+
+use Drupal\entity_test\Entity\EntityTest;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests the language select widget.
+ *
+ * @group language
+ */
+class LanguageSelectWidgetTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'entity_test',
+    'language',
+    'user',
+    'system',
+  ];
+
+  /**
+   * The entity form display.
+   *
+   * @var \Drupal\Core\Entity\Entity\EntityFormDisplay
+   */
+  protected $entityFormDisplay;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->installEntitySchema('entity_test');
+    $this->installEntitySchema('user');
+
+    $storage = $this->container->get('entity_type.manager')->getStorage('entity_form_display');
+    $this->entityFormDisplay = $storage->create([
+      'targetEntityType' => 'entity_test',
+      'bundle' => 'entity_test',
+      'mode' => 'default',
+      'status' => TRUE,
+    ]);
+  }
+
+  /**
+   * Tests the widget with the locked languages.
+   */
+  public function testWithIncludedLockedLanguage() {
+    $this->entityFormDisplay->setComponent('langcode', [
+      'type' => 'language_select',
+    ])->save();
+    $entity = EntityTest::create(['name' => $this->randomString()]);
+    $form = $this->container->get('entity.form_builder')->getForm($entity);
+    $options = array_keys($form['langcode']['widget'][0]['value']['#options']);
+    $this->assertSame(['en', 'und', 'zxx'], $options);
+  }
+
+  /**
+   * Test the widget without the locked languages.
+   */
+  public function testWithoutIncludedLockedLanguage() {
+    $this->entityFormDisplay->setComponent('langcode', [
+      'type' => 'language_select',
+      'settings' => ['include_locked' => FALSE],
+    ])->save();
+    $entity = EntityTest::create(['name' => $this->randomString()]);
+    $form = $this->container->get('entity.form_builder')->getForm($entity);
+    $options = array_keys($form['langcode']['widget'][0]['value']['#options']);
+    $this->assertSame(['en'], $options);
+  }
+
+}