public function testComment3()
 {
     $settings = array('TheOnlyGroup' => array());
     $comments = array();
     $configuration = new ezcConfiguration($settings, $comments);
     try {
         $dummy = $configuration->getComment('TheOnlyGroup', 'NonExistent');
         $this->fail("Expected exception not thrown");
     } catch (ezcConfigurationUnknownSettingException $e) {
         $this->assertEquals("The setting 'TheOnlyGroup', 'NonExistent' does not exist.", $e->getMessage());
     }
 }