Function test_clean_up

testing/test_python_path.py:104–130

Test that the plugin cleans up after itself.

(pytester: Pytester)

def test_clean_up(pytester: Pytester) -> None:
    class="st">""class="st">"Test that the plugin cleans up after itself."class="st">""
    class="cm"># This is tough to test behaviorally because the cleanup really runs last.
    class="cm"># So the test make several implementation assumptions:
    class="cm"># - Cleanup is done in pytest_unconfigure().
    class="cm"># - Not a hook wrapper.
    class="cm"># So we can add a hook wrapper ourselves to test what it does.
    pytester.makefile(class="st">".ini", pytest=class="st">"[pytest]\npythonpath=I_SHALL_BE_REMOVED\n")
    pytester.makepyfile(test_foo=class="st">""class="st">"def test_foo(): pass"class="st">"")

    before: list[str] | None = None
    after: list[str] | None = None

    class Plugin:
        @pytest.hookimpl(tryfirst=True)
        def pytest_unconfigure(self) -> None:
            nonlocal before
            before = sys.path.copy()

    result = pytester.runpytest_inprocess(plugins=[Plugin()])
    after = sys.path.copy()
    assert result.ret == 0

    assert before is not None
    assert after is not None
    assert any(class="st">"I_SHALL_BE_REMOVED" in entry for entry in before)
    assert not any(class="st">"I_SHALL_BE_REMOVED" in entry for entry in after)