public function testLogWarning()
 {
     $SofortLibAbstractMock = new SofortLibAbstractMock(self::$configkey);
     $FileLoggerHandler = $this->getMockForAbstractClass('fileLogger');
     $FileLoggerHandler->expects($this->any())->method('log')->with('warning')->will($this->returnValue('warning'));
     $SofortLibAbstractMock->setLogger($FileLoggerHandler);
     $SofortLibAbstractMock->setLogEnabled();
     $this->assertNull($SofortLibAbstractMock->logWarning('warning'));
 }