public function testSetRoleThrowsExceptionWhenGivenAnArbitraryObject()
 {
     try {
         $this->_helper->setRole(new \stdClass());
         $this->fail('An invalid argument was given, but a ' . 'Zend_View_Exception was not thrown');
     } catch (View\Exception\ExceptionInterface $e) {
         $this->assertContains('$role must be a string', $e->getMessage());
     }
 }