Write tests

[kberzinch]

Tests to write:

• [ ] Dues flow GUI test, including online payment. This might not be too much of a PITA with Laravel Dusk.
• [x] Regex for remote attendance links
• [ ] Permissions being used correctly in API
• [ ] Attendance creation / deduplication
• [ ] RSVP links (especially non-anonymous vs anonymous)
• [x] Resume book validity checks

[JoshOldenburg]

Use SQLite or in memory storage, running on Concourse.