Test support for extensions

In CiviCRM core test class we have a function createLogggedInnser to emulated having a logged in user

When running extension tests a) this function is not available and b) the UFClass is Drupal not Tests - which causes problems running tests.

We have a function like this in our test class.

  /**
   * Emulate a logged in user since certain functions use that.
   * value to store a record in the DB (like activity)
   * CRM-8180
   *
   * @return int
   *   Contact ID of the created user.
   */
  public function imitateAdminUser() {
    $result = $this->callAPISuccess('UFMatch', 'get', array(
      'uf_id' => 1,
      'sequential' => 1,
    ));
    if (empty($result['id'])) {
      $contact = $this->callAPISuccess('Contact', 'create', array(
        'first_name' => 'Super',
        'last_name' => 'Duper',
        'contact_type' => 'Individual',
        'api.UFMatch.create' => array('uf_id' => 1, 'uf_name' => 'Wizard'),
      ));
      $contactID = $contact['id'];
    }
    else {
      $contactID = $result['values'][0]['contact_id'];
    }
    $session = CRM_Core_Session::singleton();
    $session->set('userID', $contactID);
    CRM_Core_Config::singleton()->userPermissionClass = new CRM_Core_Permission_UnitTests();
    CRM_Core_Config::singleton()->userPermissionClass->permissions = array(
      'edit all contacts',
      'Access CiviCRM',
      'Administer CiviCRM',
    );
    return $contactID;
  }

I wonder about either

1. providing some civix support or
2. adding a new test trait \Civi\Test\UserTrait with

• createLoggedInUser
• something like the above
• move some of the stuff from the unavailable permission trait

ping @totten