Improve test coverage

[lgeiger]

Hydrogen is pretty stable but still largely untested. We should aim for improved test coverage.

I think the following parts should be fairly straight forward to test:

• code-manager.js
• store/output.js
• store/watch.js
• result-view/
  • history.js
  • index.js
  • result-view.js
  • status.js
• inspector/
  • component.js
  • index.js

[hpierce1102]

Hacktoberfest 2018 browser here (I see this was originally tagged in 2017), is this still needed? It looks like result-view/history.js and code-manager.js was taken care of already.

Assuming this is still desired and relevant, I'd love to take a crack at a few of these!

[lgeiger]

Assuming this is still desired and relevant, I'd love to take a crack at a few of these!

This is great! The issue is still relevant, though the list might be a bit outdated. Feel free to jump on our slack https://slack.nteract.io/ if have any questions.