def test_fileUrandom(self):
        try:
            self._check(self.factory._fileUrandom)
        except randbytes.SourceNotAvailable:
            # The test should only fail in /dev/urandom doesn't exist
            self.assertFalse(os.path.exists('/dev/urandom'))
L{RandomFactory._fileUrandom} should work as a random source whenever
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/test/test_randbytes.py/ConditionalSecureRandomTestCase.test_fileUrandom