Improve test coverage

This issue serves as a parent tracking issue for several sub issues for improving test coverage in hcb. For any of the specific issues for a given file/directory, feel free to break up the additional tests into as many smaller PRs as makes sense. Also if it makes sense to add tests to some other parts of the codebase due to factory improvements, call those out but feel free to make those changes as well.

We will loosely follow recommendations from these 2 resources
1. https://www.codewithjason.com/complete-guide-to-rails-testing/
2. https://books.thoughtbot.com/books/testing-rails.html