.../ConfigTest/ConfigTestHalJsonAnonTest.php       | 42 +++++++++++++++++
 .../ConfigTest/ConfigTestHalJsonBasicAuthTest.php  | 53 +++++++++++++++++++++
 .../config_test_rest/config_test_rest.info.yml     |  7 +++
 .../config_test_rest/config_test_rest.module       | 26 +++++++++++
 .../config_test_rest.permissions.yml               |  2 +
 .../ConfigTest/ConfigTestJsonAnonTest.php          | 36 +++++++++++++++
 .../ConfigTest/ConfigTestJsonBasicAuthTest.php     | 52 +++++++++++++++++++++
 .../ConfigTest/ConfigTestResourceTestBase.php      | 54 ++++++++++++++++++++++
 8 files changed, 272 insertions(+)

diff --git a/core/modules/hal/tests/src/Functional/EntityResource/ConfigTest/ConfigTestHalJsonAnonTest.php b/core/modules/hal/tests/src/Functional/EntityResource/ConfigTest/ConfigTestHalJsonAnonTest.php
new file mode 100644
index 0000000..cf687e6
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/ConfigTest/ConfigTestHalJsonAnonTest.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace Drupal\Tests\hal\Functional\EntityResource\ConfigTest;
+
+use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
+use Drupal\Tests\rest\Functional\EntityResource\ConfigTest\ConfigTestResourceTestBase;
+
+/**
+ * @group hal
+ */
+class ConfigTestHalJsonAnonTest extends ConfigTestResourceTestBase {
+
+  use AnonResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['hal'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'hal_json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/hal+json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $expectedErrorMimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUpAuthentication() {
+    $this->grantPermissionsToAnonymousRole(['view config_test']);
+  }
+
+}
diff --git a/core/modules/hal/tests/src/Functional/EntityResource/ConfigTest/ConfigTestHalJsonBasicAuthTest.php b/core/modules/hal/tests/src/Functional/EntityResource/ConfigTest/ConfigTestHalJsonBasicAuthTest.php
new file mode 100644
index 0000000..9c9790d
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/ConfigTest/ConfigTestHalJsonBasicAuthTest.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Drupal\Tests\hal\Functional\EntityResource\ConfigTest;
+
+use Drupal\Tests\hal\Functional\HalJsonBasicAuthWorkaroundFor2805281Trait;
+use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
+use Drupal\Tests\rest\Functional\EntityResource\ConfigTest\ConfigTestResourceTestBase;
+
+/**
+ * @group hal
+ */
+class ConfigTestHalJsonBasicAuthTest extends ConfigTestResourceTestBase {
+
+  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 $expectedErrorMimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'basic_auth';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUpAuthentication() {
+    $this->account = $this->createUser(['view config_test']);
+  }
+
+  // @todo Fix in https://www.drupal.org/node/2805281: remove this trait usage.
+  use HalJsonBasicAuthWorkaroundFor2805281Trait {
+    HalJsonBasicAuthWorkaroundFor2805281Trait::verifyResponseWhenMissingAuthentication insteadof BasicAuthResourceTestTrait;
+  }
+
+}
diff --git a/core/modules/rest/tests/modules/config_test_rest/config_test_rest.info.yml b/core/modules/rest/tests/modules/config_test_rest/config_test_rest.info.yml
new file mode 100644
index 0000000..cf9efee
--- /dev/null
+++ b/core/modules/rest/tests/modules/config_test_rest/config_test_rest.info.yml
@@ -0,0 +1,7 @@
+name: 'Configuration test REST'
+type: module
+package: Testing
+version: VERSION
+core: 8.x
+dependencies:
+  - config_test
diff --git a/core/modules/rest/tests/modules/config_test_rest/config_test_rest.module b/core/modules/rest/tests/modules/config_test_rest/config_test_rest.module
new file mode 100644
index 0000000..f7e24a2
--- /dev/null
+++ b/core/modules/rest/tests/modules/config_test_rest/config_test_rest.module
@@ -0,0 +1,26 @@
+<?php
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Session\AccountInterface;
+
+
+/**
+ * Implements hook_entity_type_alter().
+ */
+function config_test_rest_entity_type_alter(array &$entity_types) {
+  // Undo part of what config_test_entity_type_alter() did: remove this
+  // config_test_no_status entity type, because it uses the same entity class as
+  // the config_test entity type, which makes REST deserialization impossible.
+  unset($entity_types['config_test_no_status']);
+}
+
+/**
+ * Implements hook_ENTITY_TYPE_access().
+ */
+function config_test_rest_config_test_access(EntityInterface $entity, $operation, AccountInterface $account) {
+  // Add permission, so that EntityResourceTestBase's scenarios can test access
+  // being denied. By default, all access is always allowed for the config_test
+  // config entity.
+  return AccessResult::forbiddenIf(!$account->hasPermission('view config_test'))->cachePerPermissions();
+}
diff --git a/core/modules/rest/tests/modules/config_test_rest/config_test_rest.permissions.yml b/core/modules/rest/tests/modules/config_test_rest/config_test_rest.permissions.yml
new file mode 100644
index 0000000..b8fd229
--- /dev/null
+++ b/core/modules/rest/tests/modules/config_test_rest/config_test_rest.permissions.yml
@@ -0,0 +1,2 @@
+view config_test:
+  title: 'View ConfigTest entities'
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/ConfigTest/ConfigTestJsonAnonTest.php b/core/modules/rest/tests/src/Functional/EntityResource/ConfigTest/ConfigTestJsonAnonTest.php
new file mode 100644
index 0000000..139e17f
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/ConfigTest/ConfigTestJsonAnonTest.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\ConfigTest;
+
+use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
+
+/**
+ * @group rest
+ */
+class ConfigTestJsonAnonTest extends ConfigTestResourceTestBase {
+
+  use AnonResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $expectedErrorMimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUpAuthentication() {
+    $this->grantPermissionsToAnonymousRole(['view config_test']);
+  }
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/ConfigTest/ConfigTestJsonBasicAuthTest.php b/core/modules/rest/tests/src/Functional/EntityResource/ConfigTest/ConfigTestJsonBasicAuthTest.php
new file mode 100644
index 0000000..f7365a6
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/ConfigTest/ConfigTestJsonBasicAuthTest.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\ConfigTest;
+
+use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
+use Drupal\Tests\rest\Functional\JsonBasicAuthWorkaroundFor2805281Trait;
+
+/**
+ * @group rest
+ */
+class ConfigTestJsonBasicAuthTest extends ConfigTestResourceTestBase {
+
+  use BasicAuthResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['basic_auth'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $expectedErrorMimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'basic_auth';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUpAuthentication() {
+    $this->account = $this->createUser(['view config_test']);
+  }
+
+  // @todo Fix in https://www.drupal.org/node/2805281: remove this trait usage.
+  use JsonBasicAuthWorkaroundFor2805281Trait {
+    JsonBasicAuthWorkaroundFor2805281Trait::verifyResponseWhenMissingAuthentication insteadof BasicAuthResourceTestTrait;
+  }
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/ConfigTest/ConfigTestResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/ConfigTest/ConfigTestResourceTestBase.php
new file mode 100644
index 0000000..2e93715
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/ConfigTest/ConfigTestResourceTestBase.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\ConfigTest;
+
+use Drupal\Tests\rest\Functional\EntityResource\EntityResourceTestBase;
+
+abstract class ConfigTestResourceTestBase extends EntityResourceTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['config_test', 'config_test_rest'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $entityType = 'config_test';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function createEntity() {
+    $config_test = entity_create('config_test', [
+      'id' => 'llama',
+      'label' => 'Llama',
+    ]);
+    $config_test->save();
+
+    return $config_test;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getExpectedNormalizedEntity() {
+    assert('$this->entity instanceof \Drupal\Core\Entity\EntityInterface', 'Entity must already have been created.');
+    $normalization = [
+      'uuid' => $this->entity->uuid(),
+      'id' => 'llama',
+      'weight' => 0,
+      'langcode' => 'en',
+      'status' => TRUE,
+      'dependencies' => [],
+      'label' => 'Llama',
+      'style' => NULL,
+      'size' => NULL,
+      'size_value' => NULL,
+      'protected_property' => NULL,
+    ];
+
+    return $normalization;
+  }
+
+}