def pytest_collection_modifyitems(config, items): """Prefer faster tests.""" fast_items = [] slow_items = [] neutral_items = [] slow_fixturenames = ("testdir",) for item in items: try: fixtures = item.fixturenames except AttributeError: # doctest at least # (https://github.com/pytest-dev/pytest/issues/5070) neutral_items.append(item) else: if any(x for x in fixtures if x in slow_fixturenames): slow_items.append(item) else: marker = item.get_closest_marker("slow") if marker: slow_items.append(item) else: fast_items.append(item) items[:] = fast_items + neutral_items + slow_items