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It would be useful to make the test client class an overridable property (as is currently the case with response_class).
It would then be possible to insert a custom TestClient class with additional methods (for example, a "login" method) in unit tests.
app.test_client_class = MyCustomClient
client = app.test_client()
Added the ability to override the test client's class. This closed by 4b65c7e
Added the ability to override the test client's class. This fixes #148