Deprecation warning for Werkzeug 2.1
The tests are using some feature that will be deprecated in Werkzeug 2.1:
DeprecationWarning: 'BaseResponse' is deprecated and will be removed in Werkzeug 2.1. 'Response' now includes the functionality directly.
DeprecationWarning: The test client no longer returns a tuple, it returns a 'TestResponse'. Tuple unpacking is deprecated and will be removed in Werkzeug 2.1. Access the attributes 'data', 'status', and 'headers' instead.
I think it will be good to remove those warnings preventively. I guess we can now depends on Werkzeug >= 2.0.