How to parametrize fixtures in pytest
Parametrization of arguments in test functions can be achieved with the built-in pytest.mark.parametrize decorator. Maybe a bit less known is the fact that pytest fixtures can be parametrized as well. pytest.fixture accepts a params argument, a list of parameters. A fixture with params will be executed multiple times, one time for each parameter in params. And each time a fixture is executed all the dependent tests (the ones that use that fixture) will be executed as well.
In this example, test_dict is a fixture that is parametrized with 2 fixtures, min_dict and full_dict, meaning the test_dict fixture will be executed two times and therefore also our test_instantiation will be executed twice due to the fixture. On top of that, we have a parametrization of the arguments indentation and expected_linebreak in test_instantiation. So in total, our test_indentation will be called 4 times.
dependencies: python3.9, pytest==7.1.2