pytest dynamic fixtures

A decorator for generating dynamic fixtures.

Usage

The decorator takes the following arguments:

• args_list: A list of arguments, in the tuple format.
• name_generator: A callable which generates the name of the fixture given a tuple of args.
• fixture_params: A dict of params to pass directly to the pytest fixture decorator.
• fixtures: A list of fixtures this fixture should depend on. You should put the fixture name in the arguments of the function, at the end.

Examples

Generates two session fixtures named jack and bill. The value of each fixture is the surname of the person.

@dynamic_fixture(args_list=[("jack", "castleton"), ("bill", "allen")],
                 name_generator=lambda x, _: x,
                 fixture_params={"scope": "session"})
def generate_surname_fixture(_: str, surname: str) -> str:
    return surname

The following generates two fixtures named jack_surname_length and bill_surname_length. The fixtures depend on the request fixture, which is used in the function by declaring request as an argument.

@dynamic_fixture(args_list=[("jack",), ("bill",)],
                 name_generator=lambda x: f"{x}_surname_length",
                 fixtures=["request"])
def generate_surname_length(name: str, request):
    surname = request.getfixturevalue(name)
    return len(surname)