Frontend test coverage

[luispabon]

Not sure what's achievable yet as I'm pretty new at react from scratch.

• 10% coverage
• 50% coverage
• 80% coverage
• 95%+ coverage

[luispabon]

Changed to 2.1 milestone as even though tests are essential, this is not mission critical and I wouldn't want to delay a release due to me needing to figure out how to correctly unit-and-functional-test a react app.