function test_img_caption_shortcode_with_old_format() {
    $result = img_caption_shortcode(
      array(
        'width'   => 20,
        'caption' => $this->caption,
      )
    );

    $this->assertEquals( 2, preg_match_all( '/wp-caption/', $result, $_r ) );
    $this->assertEquals( 1, preg_match_all( '/alignnone/', $result, $_r ) );
    $this->assertEquals( 1, preg_match_all( "/{$this->caption}/", $result, $_r ) );

    if ( current_theme_supports( 'html5', 'caption' ) ) {
      $this->assertEquals( 1, preg_match_all( '/width: 20/', $result, $_r ) );
    } else {
      $this->assertEquals( 1, preg_match_all( '/width: 30/', $result, $_r ) );
    }
  }