Celery test failed about cookiecutter-flask-restful HOT 4 CLOSED

@pytest.fixture
def celery_worker_parameters():
    return {
        'perform_ping_check': False,
    }

____________________________________________________ test_example _____________________________________________________

celery_app = <Celery celery.tests at 0x1aa60d7c688>, celery_worker = <Worker: gen4968@AlexLyn-PC (running)>

    def test_example(celery_app, celery_worker):
        """Simply test our dummy task using celery"""
        res = dummy_task.delay()
>       assert res.get() == "OK"

tests\test_celery.py:43:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox\tests\lib\site-packages\celery\result.py:237: in get
    on_message=on_message,
.tox\tests\lib\site-packages\celery\backends\base.py:668: in wait_for_pending
    return result.maybe_throw(propagate=propagate, callback=callback)
.tox\tests\lib\site-packages\celery\result.py:342: in maybe_throw
    self.throw(value, self._to_remote_traceback(tb))
.tox\tests\lib\site-packages\celery\result.py:335: in throw
    self.on_ready.throw(*args, **kwargs)
.tox\tests\lib\site-packages\vine\promises.py:244: in throw
    reraise(type(exc), exc, tb)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

tp = <class 'celery.exceptions.NotRegistered'>
value = Task of kind 'myapi.tasks.example.dummy_task' never registered, please make sure it's imported., tb = None

    def reraise(tp, value, tb=None):
        """Reraise exception."""
        if value.__traceback__ is not tb:
            raise value.with_traceback(tb)
>       raise value
E       celery.exceptions.NotRegistered: 'myapi.tasks.example.dummy_task'

.tox\tests\lib\site-packages\vine\five.py:195: NotRegistered

@pytest.fixture(scope="session")
def celery_worker_pool():
    return "prefork"

@pytest.fixture(scope="session")
def celery_worker_pool():
    return "solo"