Created
August 8, 2018 19:10
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| the parametersets of the different fixtures create a dependency tree, | |
| so the test using only foo gets executed 3 times, | |
| the test using bar gets executed 9 times | |
| and the test using baz gets executed 27 times | |
| simply generating the runs in order of the tests would mean that for each test all fxtures of all scopes would have to be set up and tear down | |
| so foo would setup 39 times instead of 3 times | |
| pytest does something to reorder the 39 tests after it generated them to limit the setup/teardown actions based on shared bits of that topology | |
| what i want to do is take the topology of the fixtures and their parameters, and the list of tests and what they need, and generate a list of actions to set up/tear down those fixtures and run the actual tests |
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| # not run, jsut to show the structure | |
| @pytest.fixture(params=[1,2,3], scope="session") | |
| def foo(request): | |
| return request.param | |
| @pytest.fixture(params=list("abc"), scope="module") | |
| def bar(request, foo): | |
| return request.param | |
| @pytest.fixture(params=list(",.-"), scope="function") | |
| def baz(request, bar): | |
| return request.param | |
| def test_b(bar): | |
| pass | |
| def test_a(foo): | |
| pass | |
| def test_c(baz): | |
| pass |
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