createLogger(); // 断言变量属于给定类型 $this->assertInstanceOf(StdoutLogger::class, $logger); } public function testCanCreateFileLogging() { $loggerFactory = new FileLoggerFactory(sys_get_temp_dir()); $logger = $loggerFactory->createLogger(); // 断言变量属于给定类型 $this->assertInstanceOf(FileLogger::class, $logger); } }