Extend test with oauth2 code to reproduce #180

[jwillemsen]

* tests/test_config_flow.py:

[jwillemsen]

Reproducer for #180

[jwillemsen]

I made this working for my integration test, see jwillemsen/daikin_onecta#94, I will try to find out what is the change that is required here to fix this CI

[MatthewFlamm]

I'm not that familiar with oath2 in homeassistant. I would assume that you have to register something or add some code to the integration that is tested?

[jwillemsen]

I still haven't figured out why it now works with my custom integration, it looks it is not just the change in my test code, when I have some spare time I will try if I can find some necessary code that needs to be added to the test integration as part of this repo, something is missing somewhere

[MatthewFlamm]

Made this draft as this doesn't look close to implementing. I highly suspect code needs to be added to custom_components/ here for the test to work.