fix check of invalid jwt.encode parameters from twitcher.oauth2.CustomTokenValidator

[fmigneault]

An incorrectly configured token validator (such as in the tests) would result in failure when invoking the token generation. They will be raised upon initialization to allow early catch of the problem.

FAILED tests/functional/test_oauth2_app.py::OAuth2AppTests::test_compute_with_header - TypeError: Issuer (iss) must be a string.
FAILED tests/functional/test_oauth2_app.py::OAuth2AppTests::test_compute_with_param - TypeError: Issuer (iss) must be a string.

Error seen during #152 CI runs.

[cehbrecht]

... when tests pass :)

[fmigneault]

@cehbrecht
Do you want me to create a PR that combines everything? They are interlocking each other because of pkg_resource #149

I also see that CodeCov complains about a missing token.
I sent a request to accept in bird-house org. I do not have access to enable it myself.

[Zeitsperre]

@fmigneault Message received. Check your organisation status.

Codecov is currently installed and enabled for all repositories. If you could specify under the GitHub app permissions which repos specifically need Codecov, both @tlvu and I would be happy.

Let me know if you need anything else.

[fmigneault]

@Zeitsperre
Thanks. Got it. I'll test if the updated token works with the installed app.

[tlvu]

If you could specify under the GitHub app permissions which repos specifically need Codecov, both @tlvu and I would be happy.

@fmigneault
Yes, please selectively enable Codecov for the repos that need it only, not for all repos, which would also automatically include future private repos, we don't want that !

[fmigneault]

@tlvu Yes. It is enabled only for this repo. Others need to added it if needed.