class Tests(unittest.TestCase):
    def test_sum(self):
        self.assertEqual(sum(2, 3), 5)

    def test_concat(self):
        self.assertEqual(concat("abc", "xy"), "abc xy")

    def test_div(self):
        self.assertEqual(divide(3, 2, False), 1.5)
        self.assertEqual(divide(3, 2), 1)

    def test_equiv(self):
        list1 = [1, 2, 3]
        list2 = [1, 2, 3]
        self.assertEqual(equiv_val("a", "A"), False)
        self.assertEqual(equiv_val("a", "a"), True)
        self.assertEqual(equiv_mem(list1, list1), True)
        self.assertEqual(equiv_mem(list1, list2), False)

    def test_odds(self):
        self.assertEqual(oddlist([1, 3, 5]), True)
        self.assertEqual(oddlist([1, "3", 5]), False)

    def test_lookup(self):
        self.assertEqual(lookup({"a": 1, "b": 5}, "b"), 5)
        self.assertEqual(lookup({"a": 1, "b": 5}, "c"), False)

    def test_fact(self):
        self.assertEqual(factorialdict(1), {0: 1})
        self.assertEqual(factorialdict(5), {0: 1, 1: 1, 2: 2, 3: 6, 4: 24})


if __name__ == '__main__':
    unittest.main()