Add youtube test back

projects/plugins/jetpack/tests/php/modules/shortcodes/test-class.youtube.php

@@ -92,6 +92,32 @@ public function get_youtube_id_options() {
 		);
 	}
 
+	/**
+	 * @author Toro_Unit
+	 * @covers ::youtube_shortcode
+	 * @since 3.9
+	 */
+	public function test_replace_url_with_iframe_in_the_content() {
+		global $post;
+
+		$youtube_id = 'JaNH56Vpg-A';
+		$url        = 'http://www.youtube.com/watch?v=' . $youtube_id;
+		$post       = self::factory()->post->create_and_get( array( 'post_content' => "[youtube $url]" ) );
+
+		wpcom_youtube_embed_crazy_url_init();
+		setup_postdata( $post );
+		ob_start();
+		// This below is needed since Core inserts "loading=lazy" right after the iframe opener.
+		add_filter( 'wp_lazy_loading_enabled', '__return_false' );
+		the_content();
+		remove_all_filters( 'wp_lazy_loading_enabled' );
+		$actual = ob_get_clean();
+		wp_reset_postdata();
+		$this->assertStringContainsString( '<span class="embed-youtube"', $actual );
+		$this->assertStringContainsString( '<iframe class="youtube-player"', $actual );
+		$this->assertStringContainsString( "https://www.youtube.com/embed/$youtube_id", $actual );
+	}
+
 	/**
 	 * Gets the test data for jetpack_shortcode_youtube_args().
 	 *