def test_formatTimeWithNoFormat(self):
        """
        If C{timeFormat} argument is L{None}, we get the default output.
        """
        t = mktime((2013, 9, 24, 11, 40, 47, 1, 267, 1))
        self.assertEqual(formatTime(t, timeFormat=None), u"-")
        self.assertEqual(formatTime(t, timeFormat=None, default=u"!"), u"!")

        If C{timeFormat} argument is L{None}, we get the default output.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/logger/test/test_format.py