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Jest cheat sheet
Jest-Dom is not required but makes writing tests much easier because it extends Jest matchers (methods that let you test values in different ways e.g. toBe(), toHaveBeenCalled()) and allows you to write clearer tests.
Above we are destructuring props and state. We are also returning a Semantic UI React Search module. In essence, the above will render an input field. When changed, it will call onSearchChange and Semantic UI React will automatically pass two arguments, event and data (all props, including current value). One of onSearchChange’s jobs is to call an API and return results that match the current value.
Why Jest and RTL (React Testing Library)?
Another popular tool is Enzyme, but many believe that it can lead to bad testing practices. The main concern is that Enzyme offers extra utilities that allow you to test the internal workings of a component (e.g. read and set state of the component). The team at React tests React; therefore, there is no need for you to test React’s functionality such as state, componentDidMount, etc. The same goes for other libraries you may use.