[4-5 days] [Master Issue] Test everything thoroughly

[will-r-wang]

Once the basic functionality of the CMS system is up and live, and the models make sense in context of each other, we need to add the appropriate tests to make sure we're not breaking anything in "production". This includes:

• Unit tests (for models, services, jobs, basic cases) that focus on independent single object tests.
• Integration tests (for end-to-end flow verifying that separate parts of the system work correctly in unison)
• Component tests

Should we create a resiliency matrix? Add regression testing?