/**
 * Information on Features override status. Can fail if some features are overridden.
 *
 * see http://blog.dcycle.com/blog/102
 *
 * @param $exceptions = array()
 *   Overrides we know of and which should not trigger a failure:
 *
 *     array(
 *       'my_feature_name' => array(
 *         'user_permission',
 *         ...
 *       ),
 *       'feature_2' => array(
 *         'variable',
 *       ),
 *     );
 *
 *  For the feature components defined in this array, tests will not fail if they
 *  are overridden. In this example, no feature is allowed to be overridden, _except_
 *  user_permissions in my_feature_name and variable in feature_2.
 */
function _checkFeaturesStatus($exceptions = array()) {
  module_load_include('inc', 'features', 'features.export');
  module_load_include('inc', 'features', 'features.admin');
  $states = features_get_component_states();
  foreach ($states as $feature => $components) {
    foreach ($components as $component => $status) {
      $fail = FALSE;
      $message = 'The ' . $component . ' component of the feature ' . $feature . ' has the status ' . ($status ? 'OVERRIDDEN' : 'NOT OVERRIDDEN');
      if ($status) {
        if (!isset($exceptions[$feature]) || in_array($component, $exceptions[$feature])) {
          $message .= ' but this exception is allowed by the test';
        }
        else {
          $fail = TRUE;
          $this->assertFalse($fail, 'Please see verbose message to see the exact difference between the database and the code for the component ' . $component . ' of feature ' . $feature);
          $overrides = features_detect_overrides(features_load_feature($feature));
          $this->verbose('<pre>' . print_r($overrides[$component], TRUE) . '</pre>');
        }
      }
      $this->assertFalse($fail, $message);
    }
  }
}