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diff --git a/web/core/modules/rest/tests/src/Functional/ResourceTest.php b/web/core/modules/rest/tests/src/Functional/ResourceTest.php
new file mode 100644
index 000000000..1e8babe0d
--- /dev/null
+++ b/web/core/modules/rest/tests/src/Functional/ResourceTest.php
@@ -0,0 +1,160 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional;
+
+use Drupal\Core\Session\AccountInterface;
+use Drupal\entity_test\Entity\EntityTest;
+use Drupal\rest\Entity\RestResourceConfig;
+use Drupal\rest\RestResourceConfigInterface;
+use Drupal\Tests\BrowserTestBase;
+use Drupal\user\Entity\Role;
+use Drupal\user\RoleInterface;
+use GuzzleHttp\RequestOptions;
+
+/**
+ * Tests the structure of a REST resource.
+ *
+ * @group rest
+ */
+class ResourceTest extends BrowserTestBase {
+
+  /**
+   * Modules to install.
+   *
+   * @var array
+   */
+  public static $modules = ['hal', 'rest', 'entity_test', 'rest_test'];
+
+  /**
+   * The entity.
+   *
+   * @var \Drupal\Core\Entity\EntityInterface
+   */
+  protected $entity;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    // Create an entity programmatic.
+    $this->entity = EntityTest::create([
+      'name' => $this->randomMachineName(),
+      'user_id' => 1,
+      'field_test_text' => [
+        0 => [
+          'value' => $this->randomString(),
+          'format' => 'plain_text',
+        ],
+      ],
+    ]);
+    $this->entity->save();
+
+    Role::load(AccountInterface::ANONYMOUS_ROLE)
+      ->grantPermission('view test entity')
+      ->save();
+  }
+
+  /**
+   * Tests that a resource without formats cannot be enabled.
+   */
+  public function testFormats() {
+    RestResourceConfig::create([
+      'id' => 'entity.entity_test',
+      'granularity' => RestResourceConfigInterface::METHOD_GRANULARITY,
+      'configuration' => [
+        'GET' => [
+          'supported_auth' => [
+            'basic_auth',
+          ],
+        ],
+      ],
+    ])->save();
+
+    // Verify that accessing the resource returns 406.
+    $this->drupalGet($this->entity->urlInfo()->setRouteParameter('_format', 'hal_json'));
+    // \Drupal\Core\Routing\RequestFormatRouteFilter considers the canonical,
+    // non-REST route a match, but a lower quality one: no format restrictions
+    // means there's always a match and hence when there is no matching REST
+    // route, the non-REST route is used, but can't render into
+    // application/hal+json, so it returns a 406.
+    $this->assertResponse('406', 'HTTP response code is 406 when the resource does not define formats, because it falls back to the canonical, non-REST route.');
+  }
+
+  /**
+   * Tests that a resource without authentication cannot be enabled.
+   */
+  public function testAuthentication() {
+    RestResourceConfig::create([
+      'id' => 'entity.entity_test',
+      'granularity' => RestResourceConfigInterface::METHOD_GRANULARITY,
+      'configuration' => [
+        'GET' => [
+          'supported_formats' => [
+            'hal_json',
+          ],
+        ],
+      ],
+    ])->save();
+
+    // Verify that accessing the resource returns 401.
+    $this->drupalGet($this->entity->urlInfo()->setRouteParameter('_format', 'hal_json'));
+    // \Drupal\Core\Routing\RequestFormatRouteFilter considers the canonical,
+    // non-REST route a match, but a lower quality one: no format restrictions
+    // means there's always a match and hence when there is no matching REST
+    // route, the non-REST route is used, but can't render into
+    // application/hal+json, so it returns a 406.
+    $this->assertResponse('406', 'HTTP response code is 406 when the resource does not define formats, because it falls back to the canonical, non-REST route.');
+  }
+
+  /**
+   * Tests that serialization_class is optional.
+   */
+  public function testSerializationClassIsOptional() {
+    RestResourceConfig::create([
+      'id' => 'serialization_test',
+      'granularity' => RestResourceConfigInterface::METHOD_GRANULARITY,
+      'configuration' => [
+        'POST' => [
+          'supported_formats' => [
+            'json',
+          ],
+          'supported_auth' => [
+            'cookie',
+          ]
+        ],
+      ],
+    ])->save();
+    \Drupal::service('router.builder')->rebuildIfNeeded();
+
+    Role::load(RoleInterface::ANONYMOUS_ID)
+      ->grantPermission('restful post serialization_test')
+      ->save();
+
+    $serialized = $this->container->get('serializer')->serialize(['foo', 'bar'], 'json');
+    $request_options = [
+      RequestOptions::HEADERS => ['Content-Type' => 'application/json'],
+      RequestOptions::BODY => $serialized,
+    ];
+    /** @var \GuzzleHttp\ClientInterface $client */
+    $client = $this->getSession()->getDriver()->getClient()->getClient();
+    $response = $client->request('POST', $this->buildUrl('serialization_test', ['query' => ['_format' => 'json']]), $request_options);
+    $this->assertSame(200, $response->getStatusCode());
+    $this->assertSame('["foo","bar"]', (string) $response->getBody());
+  }
+
+  /**
+   * Tests that resource URI paths are formatted properly.
+   */
+  public function testUriPaths() {
+    /** @var \Drupal\rest\Plugin\Type\ResourcePluginManager $manager */
+    $manager = \Drupal::service('plugin.manager.rest');
+
+    foreach ($manager->getDefinitions() as $resource => $definition) {
+      foreach ($definition['uri_paths'] as $key => $uri_path) {
+        $this->assertFalse(strpos($uri_path, '//'), 'The resource URI path does not have duplicate slashes.');
+      }
+    }
+  }
+
+}