Handler handler = new Handler();
        URLConnection conn = handler.openConnection(url);

        assertTrue(conn instanceof Handler.GcsURLConnection);
        Handler.GcsURLConnection gcsConn = (Handler.GcsURLConnection) conn;

        // Use reflection to access private fields for testing
        assertEquals("mybucket", getField(gcsConn, "bucketName"));

     *
     * @param u The URL to open a connection to
     * @return A new GcsURLConnection instance
     * @throws IOException If the connection cannot be opened
     */
    @Override
    protected URLConnection openConnection(final URL u) throws IOException {
        return new GcsURLConnection(u);
    }

    /**
     * GcsURLConnection is a URL connection implementation for accessing GCS objects.