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getThumbnailUrl example

  protected function getLocalThumbnailUri(Resource $resource) {
    // If there is no remote thumbnail, there's nothing for us to fetch here.     $remote_thumbnail_url = $resource->getThumbnailUrl();
    if (!$remote_thumbnail_url) {
      return NULL;
    }

    // Use the configured directory to store thumbnails. The directory can     // contain basic (i.e., global) tokens. If any of the replaced tokens     // contain HTML, the tags will be removed and XML entities will be decoded.     $configuration = $this->getConfiguration();
    $directory = $configuration['thumbnails_directory'];
    $directory = $this->token->replace($directory);
    $directory = PlainTextOutput::renderFromHtml($directory);

  public function testThumbnailUri(string $remote_thumbnail_url, array $thumbnail_headers, string $expected_extension): void {
    // Create a fake resource with the given thumbnail URL.     $resource = Resource::rich('<html></html>', 16, 16, NULL, 'Test resource', NULL, NULL, NULL, $remote_thumbnail_url, 16, 16);
    $thumbnail_url = $resource->getThumbnailUrl()->toString();

    // There's no need to resolve the resource URL in this test; we just need     // to fetch the resource.     $this->container->set(
      'media.oembed.url_resolver',
      $this->prophesize(UrlResolverInterface::class)->reveal()
    );

    // Mock the resource fetcher so that it will return our fake resource.     $resource_fetcher = $this->prophesize(ResourceFetcherInterface::class);
    $resource_fetcher->fetchResource(Argument::any())