We have a working test set up and a clear understanding of what the different tools and libraries can do for us. The next thing to do is to test a real-world component.
The Button we used in the previous example was great and we should always try to make our components as simple as possible; but sometimes we need to implement different kinds of logic and state, which makes the tests more challenging.
The component we are going to test is TodoTextInput from the Redux TodoMVC example:
https://github.com/reactjs/redux/blob/master/examples/todomvc/src/components/TodoTextInput.js
You can easily copy it into your Jest project folder.
It represents a nice example because it has various props, its class names change according to the props it receives, and it has three event handlers that implement a bit of logic that we can test.
The TodoMVC example is a standard way of creating a real-world application with the different frameworks in order to compare their features and...