Technical spike - testing React using Jest about policy-picker HOT 1 CLOSED

Talk with Elias:

• Q: What does testing with React look like?
  A: If we get Redux set up, the easiest thing to test would be Action Creators and Reducers as they are pure.
• If we get to the stage where we want to test our components, we can use Jest's Mock Shallow Renderer/Mock DOM, which will allow us to render the component to a fake DOM. We can then with a lot of the Statleless Functional Components by passing them different props and seeing if they react the way that we'd want to. We can thereby check that certain elements are rendering correctly, e.g. that said component is red on being given certain props. This is like Unit Testing.
  If we have a component containing other components, it would be more like Integration Testing.
  BTW, Jest documentation is pretty good.

from policy-picker.