def METHOD_NAME(self):
    import clr
    from System import DateTime, TimeSpan
    pydt = datetime.datetime(2015, 4, 25, 8, 39, 54)
    netdt = DateTime(2015, 4, 25, 9, 39, 54)
    result = netdt.Subtract(pydt)
    expected = TimeSpan(1, 0, 0)
    self.assertEqual(expected, result)