def test_introduce_value(self): d = {'a': 42} with mutated_dict(d, {'b': 21}): self.assertEqual({'a': 42, 'b': 21}, d) self.assertEqual({'a': 42}, d)
def test_dict_no_mutation(self): d = {'a': 42} with mutated_dict(d, {}): self.assertEqual({'a': 42}, d) self.assertEqual({'a': 42}, d)
def test_override_value(self): d = {'a': 42, 'b': 3} with mutated_dict(d, {'a': 2}): self.assertEqual({'a': 2, 'b': 3}, d) self.assertEqual({'a': 42, 'b': 3}, d)
def test_empty_dict_no_mutation(self): d = {} with mutated_dict(d, {}): self.assertEqual({}, d) self.assertEqual({}, d)