def test_correct_format(self):
        y = fact("abcd")


#if __name__ == "__main__":
#    unittest.main()
 def test_fact_positive(self):
     self.assertEquals(fact(5), 120)
 def test_negative(self):
     y = fact(-1)
 def test_fact0(self):
     self.assertEquals(fact(0), 1)