Override parametrize content before test execution

Question

I would like to be able to dynamically parametrize a test function passed on the command line and override any previously set parametrize value.

Example of command line execution: python -m pytest --TEST_FUNCTION=test_dummy

test_file.py:

@pytest.mark.parametrize('vm_name', ['vm1', 'vm2'])
def test_dummy(self, vm_name):
    DEBUG(f'Hi {vm_name}!')

conftest.py:

def pytest_generate_tests(metafunc):
test_function = metafunc.config.getoption('--TEST_FUNCTION')
if test_function is not None and metafunc.definition.name == test_function:
    own_markers = []
    for own_marker in metafunc.definition.own_markers:
        if own_marker.args[0] == 'vm_name':
            own_markers.append(pytest.Mark(name=own_marker.name, args=('vm_name', ['vm3', 'vm4']), kwargs=own_marker.kwargs))
        else:
            own_markers.append(own_marker)
    metafunc.definition.own_markers = own_markers

This works fine and at execution time, test_dummy runs with vm3 and vm4 even though it's been marked with vm1/vm2 in the code, but the problem with my approach is that pytest.Mark() is private and this may not work forever.

Is there another or a better way to override what may have already been set with the parametrize decorator with something else?

Override parametrize content before test execution

0 Answers0