Improving the Testing Section of the Documentation

[SammyIsra]

This issue is a:

• Bug report
• Feature request
• Question / support request
• Other

The Testing Section of the documentation seems lacking. More specifically, the Example Test section does not provide an appropriate example test, since it doesn't even deal with React components and isn't really testing anything.

The document does not have enough information for someone that hasn't dealt much with testing before, and someone coming to it would have to go somewhere else to learn how to write tests for components scaffolded with nwb.

[insin]

The testing docs are about showing you what nwb's default test setup allows you to do in terms of where you put tests, which libraries are available by default, and how to change the testing setup to your liking via config, but they don't assume you know anything about what you're doing in the tests themselves.

I'd be happy to add a section up top with suitable resources for that if people have recommendations.

Example tests and projects for real React example code are shown in the React App guide and React Component guide, which we should link to from the testing docs as a next step. They're also a more suitable place to expand on the different testing approaches once nwb has built-in support for them.

e.g. I'd like to be able to include Enzyme by default for shallow render testing support (#119), provide a way to enable use of Jest as your main test runner and for snapshot testing (#173) and something else for end-to-end testing (#138)