Fix missing action for OIDC test route

[aduth]

🛠 Summary of changes

Fixes a missing action for the /test/oidc route.

In #9923, test routes were added for an OIDC test login controller, including /test/oidc pointing to a #start action, but the #start action wasn't implemented.

The approach here redirects to /test/oidc/auth_request. The thinking being that the corresponding /test/saml request "starts" an IAL1 authentication and returns the user to the sign-in screen, which is the same as what the /test/oidc/auth_request route does.

📜 Testing Plan

1. Go to http://localhost:3000/test/oidc
2. Observe that you don't see a 500 error, and instead are redirected to sign in to the OIDC test app

[zachmargolis]

LGTM, I got the error "Bad client_id" when I tried that URL? Must be missing some other config

[aduth]

LGTM, I got the error "Bad client_id" when I tried that URL? Must be missing some other config

That's strange! I'm not entirely familiar with how this controller is expected to work, but it does appear to be referencing a client ID I'd expect to be seeded for everyone in local development:

identity-idp/app/controllers/test/oidc_test_controller.rb

Line 11 in d44ec8f

@client_id = 'urn:gov:gsa:openidconnect:sp:test'

identity-idp/config/service_providers.localdev.yml

Line 544 in d44ec8f

'urn:gov:gsa:openidconnect:sp:test':

[aduth]

Maybe try running ServiceProviderSeeder.new.run in a Rails console and see if that helps, in case your local service providers are out of date? That service provider was added only a few months ago in #9923, so it wouldn't surprise me, since I'm not aware that we have anything that regularly syncs service providers in local development?

Edit: And it's explicitly called out in the Testing Plan for #9923 to "run rake db:seed"

[zachmargolis]

Maybe try running ServiceProviderSeeder.new.run in a Rails console and see if that helps, in case your local service providers are out of date? That service provider was added only a few months ago in #9923, so it wouldn't surprise me, since I'm not aware that we have anything that regularly syncs service providers in local development?

Edit: And it's explicitly called out in the Testing Plan for #9923 to "run rake db:seed"

Confirmed! It worked after seeding