import funcsigs  
        with dag_maker():
            ret = f()
        ret.operator.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE)
    def test_with_requirements_pinned(self, dag_maker):
        @task.virtualenv(
            system_site_packages=False,
            requirements=["funcsigs==0.4"],
            python_version=PYTHON_VERSION,
            use_dill=True,
        )
        def f():
            import funcsigs
            if funcsigs.__version__ != "0.4":
                raise Exception
        with dag_maker():
            ret = f()
        ret.operator.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE)
    def test_unpinned_requirements(self, dag_maker):
        @task.virtualenv(
            system_site_packages=False,
            requirements=["funcsigs", "dill"],
            python_version=PYTHON_VERSION,
            use_dill=True,
        )
        def f():