`SpecialMWOAuthConsumerRegistration` is the flow for registering and updating OAuth 1 and OAuth 2 consumers. It would most likely involve writing unit and integration tests to cover the functionality.
We'll likely write integration tests to cover functionality related to the Special page UI, the `/propose` and `/update` features, and their interactions with the action API and the DB (e.g., `SubmitControl` for the aforementioned endpoints). It's probably possible to use `SpecialPageTestBase`, since this will involve testing a special page and `ApiTestCase` for action API-related functionality.
## Impact
[ ] Increase coverage of the respective special page: https://doc.wikimedia.org/cover-extensions/OAuth/src/Frontend/SpecialPages/SpecialMWOAuthConsumerRegistration.php.html
[ ] Increase coverage of submit control classes
[ ] https://doc.wikimedia.org/cover-extensions/OAuth/src/Control/ConsumerSubmitControl.php.html
[ ] https://doc.wikimedia.org/cover-extensions/OAuth/src/Control/SubmitControl.php.html