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无所谓ovo

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class TestStudent(unittest.TestCase):

    def test_80_to_100(self):

        s1 = Student('Bart', 80)

        s2 = Student('Lisa', 100)

        self.assertEqual(s1.get_grade(), 'A')

        self.assertEqual(s2.get_grade(), 'A')

    def test_60_to_80(self):

        s1 = Student('Bart', 60)

        s2 = Student('Lisa', 79)

        self.assertEqual(s1.get_grade(), 'B')

        self.assertEqual(s2.get_grade(), 'B')

    def test_0_to_60(self):

        s1 = Student('Bart', 0)

        s2 = Student('Lisa', 59)

        self.assertEqual(s1.get_grade(), 'C')

        self.assertEqual(s2.get_grade(), 'C')

    def test_invalid(self):

        s1 = Student('Bart', -1)

        s2 = Student('Lisa', 101)

        with self.assertRaises(ValueError):

            s1.get_grade()

        with self.assertRaises(ValueError):

            s2.get_grade()

if __name__ == '__main__':

    unittest.main()


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