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Using fixtures in pytest.mark.parametrize #349

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Originally reported by: Florian Rathgeber (BitBucket: frathgeber, GitHub: frathgeber)


I often have a use case like the following contrived example:

@pytest.fixture
def a():
    return 'a'

@pytest.fixture
def b():
    return 'b'

@pytest.mark.parametrize('arg', [a, b])
def test_foo(arg):
    assert len(arg) == 1

This doesn't currently do what's intended i.e. arg inside the test function is not the fixture value but the fixture function.

I can work around it by introducing a "meta fixture", but that's rather ugly:

@pytest.fixture(params=['a', 'b'])
def arg(request, a, b):
    return {'a': a, 'b': b}[request.param]

def test_foo(arg):
    assert len(arg) == 1

It would be convenient if a syntax like in the first case was supported.


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    topic: parametrizerelated to @pytest.mark.parametrizetype: proposalproposal for a new feature, often to gather opinions or design the API around the new feature

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