Add more tests

[itsthejoker]

Relevant issue: N/a

Description:

I set out on a grand quest to make migrating a user account migrate the warnings for that account as well, only to discover that it actually already happens as a happy accident. So I added a test that ensures this is now codified behavior.

Checklist:

• [x] Code Quality
• [x] Pep-8
• [x] Tests (if applicable)
• [x] Success Criteria Met
• [x] Inline Documentation
• [ ] Wiki Documentation (if applicable)