Generating py.test tests in Python

Question

Question first, then an explanation if you\'re interested.

In the context of py.test, how do I generate a large set of test functions from a small set of test-function te

Answer 1

Good instincts. py.test supports exactly what you're talking about with its pytest_generate_tests() hook. They explain it here.

Answer 2

You also could do that using parametrized fixtures. While hooks, is an API to build plugins for Py.test, parametrized fixtures is a generalized way to make a fixtures that outputs multiple values and generates additional test cases for them.

Plugins are meant to be some project-wide (or package-wide) features, not test case specific features and parametrized fixtures are exactly what's needed to parametrize some resource for test case(s).

So your solution could be rewritten as that:

@pytest.fixture(params=[model1, model2, model3])
def model(request):
    return request.param

def test_awesome(model):
    assert model == "awesome"