Hi all, happy to announce a better developer experience with pytest-when fixture. With pytest-mock you can define the complex mocking behavior via natural interface: ``` when(some_object, "attribute").called_with(1, 2).then_return("mocked") ``` In this case the some_object.attribute(1, 2) == "mocked". But if it will be called with any other arguments, it will return what it is suppose to return. Project GitHub: https://github.com/zhukovgreen/pytest-when zhukovgreen/pytest-when: Pytest plugin for more readable mocking github.com Support python>=3.8 and tested until 3.11 Small example from the docs: # class which we're going to mock in the test class Klass1: def some_method( self, arg1: str, arg2: int, *, kwarg1: str, kwarg2: str, ) -> str: return "Not mocked" def test_should_properly_patch_calls(when): when(Klass1, "some_method").called_with( "a", when.markers.any, kwarg1="b", kwarg2=when.markers.any, ).then_return("Mocked") assert ( Klass1().some_method( "a", 1, kwarg1="b", kwarg2="c", ) == "Mocked" ) assert ( Klass1().some_method( "not mocked param", 1, kwarg1="b", kwarg2="c", ) == "Not mocked" ) # if you need to patch a function def test_patch_a_function(when): when(example_module, "some_normal_function").called_with( "a", when.markers.any, kwarg1="b", kwarg2=when.markers.any, ).then_return("Mocked") assert ( example_module.some_normal_function( "a", 1, kwarg1="b", kwarg2="c", ) == "Mocked" ) assert ( example_module.some_normal_function( "not mocked param", 1, kwarg1="b", kwarg2="c", ) == "Not mocked" ) Thank you for any feedback -- zhukovgreen, Data Engineer @Paylocity https://github.com/zhukovgreen