def test_outFile(self):
        with StringIO() as fileHandle:
            observer = textFileLogObserver(fileHandle)
            self.assertIs(observer._outFile, fileHandle)
Returned L{FileLogObserver} has the correct outFile.
dataset/ETHPy150Open twisted/twisted/twisted/logger/test/test_file.py/TextFileLogObserverTests.test_outFile