assertGetThumbnailUrl(data, expected);

        data = "<meta property=\"og:image\" content=\"/foo.jpg\" />";
        expected = "http://example.com/foo.jpg";
        assertGetThumbnailUrl(data, expected);

        data = "<img src=\"http://example/foo.jpg\">";
        expected = "http://example/foo.jpg";
        assertGetThumbnailUrl(data, expected);

        data = "<img src=\"http://example/foo.jpg\">" //