/** * @test */ public function shouldWriteErrorMessage() { //when $this->logger->error('My error log line with param %s and %s.', array(42, 'Zaphod')); //then $logContent = $this->_readStreamContent('test://stderr'); Assert::thatString($logContent)->contains('2014-01-01 11:11:11: TEST Error: [ID: ] My error log line with param 42 and Zaphod.'); }