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    // Verify that double underscores are replaced in the identifier by default.

    $identifier = 'css__identifier__with__double__underscores';

    $expected = 'css--identifier--with--double--underscores';

    $this->assertIdentical(drupal_clean_css_identifier($identifier), $expected, 'Verify double underscores are replaced with double hyphens by default.');

    // Verify that double underscores are preserved in the identifier if the

    // variable allow_css_double_underscores is set to TRUE.

    $this->setAllowCSSDoubleUnderscores(TRUE);

    $this->assertIdentical(drupal_clean_css_identifier($identifier), $identifier, 'Verify double underscores are preserved if the allow_css_double_underscores set to TRUE.');

    // To avoid affecting other test cases, set the variable

    // allow_css_double_underscores to FALSE which is the default value.

    $this->setAllowCSSDoubleUnderscores(FALSE);

  }

  /**

   * Set the variable allow_css_double_underscores and reset the cache.

   *

   * @param $value bool

   *   A new value to be set to allow_css_double_underscores.

   */

  function setAllowCSSDoubleUnderscores($value) {

    $GLOBALS['conf']['allow_css_double_underscores'] = $value;

    drupal_static_reset('drupal_clean_css_identifier:allow_css_double_underscores');

    $block_regions = system_region_list($theme_key, REGIONS_ALL, FALSE);