def test_merge_rows(self):
        rh1 = ("internet", "tv")
        rh2 = ("internet", "test", "tv")

        expected_rows = ("internet", "test", "tv")
        result_rows = hr.merge_rows(rh1, rh2)
        self.assertEquals(expected_rows, result_rows)
    def test_merge_tuple_rows(self):
        rh1 = (("internet", "a"), ("tv", "b"))
        rh2 = (("internet", "c"), ("test", "a"), ("tv", "b"))

        expected_rows = (("internet", "a"), ("internet", "c"), ("test", "a"), ("tv", "b"))
        result_rows = hr.merge_rows(rh1, rh2)
        self.assertEquals(expected_rows, result_rows)