Is your feature request related to a problem? Please describe.
I am extending openwisp (users, controller, firmware-upgrader) as explained by the docs.
However, unless I am doing something wrong, it seems the tests here do not support depending on another config app. the admin:config_device_change viewname is hardcoded in quite a few places...

Describe the solution you'd like
firmware tests should support being extended support relying on extended config app.

Describe alternatives you've considered
I am currently copy pasting all the code that I need to replace this viewname... quite cumbersome (and not really maintainable in the long run)

Additional context
The doc points to the sample_app tests to duplicate in the extended app, but these do not assume an extended controller... maybe they should in order to raise that issue in tests ?