[pytest-dev] Help with parametrized fixtures

[Nikolaus Rath]

Hello,

I have a parametrized fixture foo, and some test cases that use it:

@pytest.fixture(params=(1,2,3,4,5))
def foo(request):
    # ...
    return foo_f

def test_1(foo):
    # ...

def test_2(foo):
    # ....

Now, I'd like to add an additional test, but running it only makes sense
for some of the fixture parameters. So far I've solved this by providing
the parameter value as a fixture attribute and skipping "unsupported" values:

@pytest.fixture(params=(1,2,3,4,5))
def foo(request):
    # ...
    foo_f.param = request.param
    return foo_f

def test_3(foo):
    if foo.param not in (1,4,5):
        raise pytest.skip("doesn't make sense")


This works, but I don't like it very much because it means that the test
suite can never be executed without skipping some tests. I'd rather
reserve skipping for cases where the test could in principle be
executed, but for some reason cannot work at the moment (e.g. because
there's no internet, or a required utility is not installed).

Is there a way to solve the above scenario without skipping tests?

Ideally, I'd be able to do something like this:

@only_for_param((1,4,5))
def test_3(foo):
    ...

Thanks!
-Nikolaus

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