python - Pytest run entire test suite with a selectable set-up fixture

Question

I'd like to essentially "inherit" a pytest suite to test different implementations of a library using the same set of test functions. I'm struggling to find answers in Google and Stack Overflow, but I think a large part of my problem is that I don't know the correct pytest nomenclature for what I want.

I'm working on a library which contains multiple implementations of an interface. Let's call them A and B.

I've got a reasonably large test suite developed against implementation A and now I want to also run the same suite against B avoiding code duplication.

I've got a fixture for each implementation that spins up the necessary resources for a test instance of A and B.

@pytest.fixture(scope='function')
def get_an_A():
    yield A(..)

And a fixture for B that depends on some other 3rd party fixtures.

@pytest.fixture(scope='function')
def get_a_B(some_other_fixture):
    yield B(..)

And a test suite that's happy to run against_either

def test_add_values_should_be_correct(my_A_or_B):
    assert my_A_or_B.of(1) + my_A_or_B.of(2) == my_A_or_B.of(3)

What I'd like to do is construct that my_A_or_B fixture that can provide As using the A fixture in one context and Bs using the B fixture in another context.

Ideally I'd like to be able to run something like this:

Run test suite against A:

> pytest tests/A

Run test suite against B:

> pytest tests/B

Run test suite against A then B

> pytest tests/

Is there a way of laying out my test suite that will allow me to do this?

question from:https://stackoverflow.com/questions/65938977/pytest-run-entire-test-suite-with-a-selectable-set-up-fixture

Answer 1

the easiest way is have all the tests in the same folder and run this (on both file's names and method's names, names must start with test_ prefix)

python -m unittest discover <PATH_TO_THE_FOLDER>