def METHOD_NAME(event, mocker, req_with_session):
    class MockingStep(checkoutflow.BaseCheckoutFlowStep):
        identifier = 'mocking'
        priority = 100
        def is_applicable(self, request):
            return False
    flow = with_mocked_step(mocker, MockingStep, event)
    req_with_session.event = event
    assert flow[3].get_next_applicable(req_with_session) is flow[6]
    # flow[3] is also skipped because no payment is required if there is no cart
    assert flow[3] is flow[6].get_prev_applicable(req_with_session)