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diff --git a/web/core/modules/media/tests/src/Traits/OEmbedTestTrait.php b/web/core/modules/media/tests/src/Traits/OEmbedTestTrait.php
new file mode 100644
index 000000000..a3699ff69
--- /dev/null
+++ b/web/core/modules/media/tests/src/Traits/OEmbedTestTrait.php
@@ -0,0 +1,89 @@
+<?php
+
+namespace Drupal\Tests\media\Traits;
+
+use Drupal\Component\Serialization\Json;
+use Drupal\Core\Url;
+use Drupal\media\OEmbed\Provider;
+
+/**
+ * Contains helper functions for testing oEmbed functionality in isolation.
+ */
+trait OEmbedTestTrait {
+
+  /**
+   * Returns the relative path to the oEmbed fixtures directory.
+   *
+   * @return string
+   */
+  protected function getFixturesDirectory() {
+    return drupal_get_path('module', 'media') . '/tests/fixtures/oembed';
+  }
+
+  /**
+   * Returns the absolute URL of the oEmbed fixtures directory.
+   *
+   * @return string
+   */
+  protected function getFixturesUrl() {
+    return $this->baseUrl . '/' . $this->getFixturesDirectory();
+  }
+
+  /**
+   * Forces Media to use the provider database in the fixtures directory.
+   */
+  protected function useFixtureProviders() {
+    $this->config('media.settings')
+      ->set('oembed_providers_url', $this->getFixturesUrl() . '/providers.json')
+      ->save();
+  }
+
+  /**
+   * Configures the http_client service so that all requests are carried out
+   * relative to the URL of the fixtures directory. For example, after calling
+   * this method, a request for foobar.html will actually request
+   * http://test-site/path/to/fuxtures/foobar.html.
+   */
+  protected function lockHttpClientToFixtures() {
+    $this->writeSettings([
+      'settings' => [
+        'http_client_config' => [
+          'base_uri' => (object) [
+            'value' => $this->getFixturesUrl() . '/',
+            'required' => TRUE,
+          ],
+        ],
+      ],
+    ]);
+  }
+
+  /**
+   * Ensures that all oEmbed provider endpoints defined in the fixture
+   * providers.json will use the media_test_oembed.resource.get route as their
+   * URL.
+   *
+   * This requires the media_test_oembed module in order to work.
+   */
+  protected function hijackProviderEndpoints() {
+    $providers = $this->getFixturesDirectory() . '/providers.json';
+    $providers = file_get_contents($providers);
+    $providers = Json::decode($providers);
+
+    $endpoint_url = Url::fromRoute('media_test_oembed.resource.get')
+      ->setAbsolute()
+      ->toString();
+
+    /** @var \Drupal\media_test_oembed\ProviderRepository $provider_repository */
+    $provider_repository = $this->container->get('media.oembed.provider_repository');
+
+    foreach ($providers as &$provider) {
+      foreach ($provider['endpoints'] as &$endpoint) {
+        $endpoint['url'] = $endpoint_url;
+      }
+      $provider_repository->setProvider(
+        new Provider($provider['provider_name'], $provider['provider_url'], $provider['endpoints'])
+      );
+    }
+  }
+
+}