diff --git a/core/modules/hal/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsHalJsonAnonTest.php b/core/modules/hal/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsHalJsonAnonTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..e90485d30c0430198db2b6612addd45b7d9826b1
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsHalJsonAnonTest.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Drupal\Tests\hal\Functional\EntityResource\ContentLanguageSettings;
+
+use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
+use Drupal\Tests\rest\Functional\EntityResource\ContentLanguageSettings\ContentLanguageSettingsResourceTestBase;
+
+/**
+ * @group hal
+ */
+class ContentLanguageSettingsHalJsonAnonTest extends ContentLanguageSettingsResourceTestBase {
+
+  use AnonResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['hal'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'hal_json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/hal+json';
+
+}
diff --git a/core/modules/hal/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsHalJsonBasicAuthTest.php b/core/modules/hal/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsHalJsonBasicAuthTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..942901bb232f0d7859059d799f2c2f0de5ee5680
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsHalJsonBasicAuthTest.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Drupal\Tests\hal\Functional\EntityResource\ContentLanguageSettings;
+
+use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
+use Drupal\Tests\rest\Functional\EntityResource\ContentLanguageSettings\ContentLanguageSettingsResourceTestBase;
+
+/**
+ * @group hal
+ */
+class ContentLanguageSettingsHalJsonBasicAuthTest extends ContentLanguageSettingsResourceTestBase {
+
+  use BasicAuthResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['hal', 'basic_auth'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'hal_json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/hal+json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'basic_auth';
+
+}
diff --git a/core/modules/hal/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsHalJsonCookieTest.php b/core/modules/hal/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsHalJsonCookieTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..4cc572f11ed8fcc15309a9c2ec10b757e8b42e5c
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsHalJsonCookieTest.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Drupal\Tests\hal\Functional\EntityResource\ContentLanguageSettings;
+
+use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
+use Drupal\Tests\rest\Functional\EntityResource\ContentLanguageSettings\ContentLanguageSettingsResourceTestBase;
+
+/**
+ * @group hal
+ */
+class ContentLanguageSettingsHalJsonCookieTest extends ContentLanguageSettingsResourceTestBase {
+
+  use CookieResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['hal'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'hal_json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/hal+json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'cookie';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsJsonAnonTest.php b/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsJsonAnonTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..344c7335e5b2780543cedc2996c2669fddbd0ae4
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsJsonAnonTest.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\ContentLanguageSettings;
+
+use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
+
+/**
+ * @group rest
+ */
+class ContentLanguageSettingsJsonAnonTest extends ContentLanguageSettingsResourceTestBase {
+
+  use AnonResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsJsonBasicAuthTest.php b/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsJsonBasicAuthTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..392213f881666358da7a0d238f24554270be03fd
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsJsonBasicAuthTest.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\ContentLanguageSettings;
+
+use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
+
+/**
+ * @group rest
+ */
+class ContentLanguageSettingsJsonBasicAuthTest extends ContentLanguageSettingsResourceTestBase {
+
+  use BasicAuthResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['basic_auth'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'basic_auth';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsJsonCookieTest.php b/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsJsonCookieTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..b0af52987b06d21284e31ea1bb042aaca9aa0e76
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsJsonCookieTest.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\ContentLanguageSettings;
+
+use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
+
+/**
+ * @group rest
+ */
+class ContentLanguageSettingsJsonCookieTest extends ContentLanguageSettingsResourceTestBase {
+
+  use CookieResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'cookie';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsResourceTestBase.php
new file mode 100644
index 0000000000000000000000000000000000000000..a8b3f8ca35df4e12e0a4d160d0da8bde29c31056
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/ContentLanguageSettings/ContentLanguageSettingsResourceTestBase.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\ContentLanguageSettings;
+
+use Drupal\language\Entity\ContentLanguageSettings;
+use Drupal\node\Entity\NodeType;
+use Drupal\Tests\rest\Functional\EntityResource\EntityResourceTestBase;
+
+abstract class ContentLanguageSettingsResourceTestBase extends EntityResourceTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['language', 'node'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $entityTypeId = 'language_content_settings';
+
+  /**
+   * @var \Drupal\language\ContentLanguageSettingsInterface
+   */
+  protected $entity;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUpAuthorization($method) {
+    $this->grantPermissionsToTestedRole(['administer languages']);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function createEntity() {
+    // Create a "Camelids" node type.
+    $camelids = NodeType::create([
+      'name' => 'Camelids',
+      'type' => 'camelids',
+    ]);
+    $camelids->save();
+
+    $entity = ContentLanguageSettings::create([
+      'target_entity_type_id' => 'node',
+      'target_bundle' => 'camelids',
+    ]);
+    $entity->setDefaultLangcode('site_default')
+      ->save();
+
+    return $entity;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getExpectedNormalizedEntity() {
+    return [
+      'default_langcode' => 'site_default',
+      'dependencies' => [
+        'config' => [
+          'node.type.camelids',
+        ],
+      ],
+      'id' => 'node.camelids',
+      'langcode' => 'en',
+      'language_alterable' => FALSE,
+      'status' => TRUE,
+      'target_bundle' => 'camelids',
+      'target_entity_type_id' => 'node',
+      'uuid' => $this->entity->uuid(),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getNormalizedPostEntity() {
+    // @todo Update in https://www.drupal.org/node/2300677.
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getExpectedCacheContexts() {
+    return [
+      'languages:language_interface',
+      'user.permissions',
+    ];
+  }
+
+}