def test_combine_single_parameter(self):
    self.assertEqual([{'a': 1, 'b': 2}, {'a': 2, 'b': 2}], test_combinations.combine(a=[1, 2], b=2))
def test_combine_single_parameter(self):
    self.assertEqual([{'a': 1, 'b': 2}, {'a': 2, 'b': 2}], test_combinations.combine(a=[1, 2], b=2))