Test for custom Google Analytics variables via Behat and Mink.

FeatureContext.php

<?php

  /**
   * @Then /^the google "(?P<variable>[^"]*)" variable should be set to "(?P<value>[^"]*)"$/
   */
  public function assertGoogleAnalyticsCustomVariable($variable, $value) {
    $map = array(
      // Custom variable name => Custom variable index.
      'gender' => 1,
      'age range' => 2,
      'zipcode' => 3,
    );
    if (!in_array($variable, array_keys($map))) {
      throw new \Exception(sprintf('No custom variable "%s" defined in %s.', $variable, __FUNCTION__));
    }

    $index = $map[$variable];

    $script = <<<JS
      var pageTracker = _gat._getTrackerByName();
      return pageTracker._getVisitorCustomVar($index);
JS;
    $result = $this->getSession()->getDriver()->getWebDriverSession()->execute(array('script' => $script, 'args' => array()));
    if ($result != $value) {
      throw new \Exception(sprintf('The custom variable "%s" with value "%s" was not found on the page.', $variable, $value));
    }
  }