Mock error using Python 3.8 environment

vb/tests/framework/interfaces/rest/datatype_resource_test.py:53 (TestDatatypeResource.test_server_retrieve_datatype_inexistent_gid)
self = <tvb.tests.framework.interfaces.rest.datatype_resource_test.TestDatatypeResource object at 0x7fcc84668460>
mocker = <pytest_mock.plugin.MockerFixture object at 0x7fcc84668580>

    def test_server_retrieve_datatype_inexistent_gid(self, mocker):
>       self._mock_user(mocker)

datatype_resource_test.py:55: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
base_resource_test.py:36: in _mock_user
    request_mock = mocker.patch.object(flask, 'g')
/Users/robert.vincze/opt/anaconda3/envs/tvb-st/lib/python3.8/site-packages/pytest_mock/plugin.py:197: in object
    return self._start_patch(
/Users/robert.vincze/opt/anaconda3/envs/tvb-st/lib/python3.8/site-packages/pytest_mock/plugin.py:161: in _start_patch
    mocked = p.start()  # type: unittest.mock.MagicMock
/Users/robert.vincze/opt/anaconda3/envs/tvb-st/lib/python3.8/unittest/mock.py:1529: in start
    result = self.__enter__()
/Users/robert.vincze/opt/anaconda3/envs/tvb-st/lib/python3.8/unittest/mock.py:1416: in __enter__
    if spec is None and _is_async_obj(original):
/Users/robert.vincze/opt/anaconda3/envs/tvb-st/lib/python3.8/unittest/mock.py:51: in _is_async_obj
    if hasattr(obj, '__func__'):
/Users/robert.vincze/opt/anaconda3/envs/tvb-st/lib/python3.8/site-packages/werkzeug/local.py:348: in __getattr__
    return getattr(self._get_current_object(), name)
/Users/robert.vincze/opt/anaconda3/envs/tvb-st/lib/python3.8/site-packages/werkzeug/local.py:307: in _get_current_object
    return self.__local()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

name = 'g'

    def _lookup_app_object(name):
        top = _app_ctx_stack.top
        if top is None:
>           raise RuntimeError(_app_ctx_err_msg)
E           RuntimeError: Working outside of application context.
E           
E           This typically means that you attempted to use functionality that needed
E           to interface with the current application object in some way. To solve
E           this, set up an application context with app.app_context().  See the
E           documentation for more information.