function test_attachment_url_to_postid() {
    $image_path    = '2014/11/' . $this->img_name;
    $attachment_id = self::factory()->attachment->create_object(
      $image_path,
      0,
      array(
        'post_mime_type' => 'image/jpeg',
        'post_type'      => 'attachment',
      )
    );

    $image_url = 'http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/' . $image_path;
    $this->assertEquals( $attachment_id, attachment_url_to_postid( $image_url ) );
  }