How to parametrize a Pytest fixture

by

This is actually possible via indirect parametrization.

This example does what you want with pytest 3.1.2:

import pytest

class TimeLine:
    def __init__(self, instances):
        self.instances = instances

@pytest.fixture
def timeline(request):
    return TimeLine(request.param)

@pytest.mark.parametrize(
    'timeline',
    ([1, 2, 3], [2, 4, 6], [6, 8, 10]),
    indirect=True
)
def test_timeline(timeline):
    for instance in timeline.instances:
        assert instance % 2 == 0

if __name__ == "__main__":
    pytest.main([__file__])

Also see this similar question.

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