React Testing Library: The Modern Way to Test React Components

React Testing Library: The Modern Way to Test React Components

Unit testing, and in our case, testing components, is a key element of any scalable and maintainable project. That truism is even more obvious now in the age of independent and shareable components. When sharing components between projects, testing serves as a way to both validate that a component behaves as expected and that it is independent and reusable (otherwise it would show to be very difficult to test).

Unit testing, and in our case, testing components, is a key element of any scalable and maintainable project. That truism is even more obvious now in the age of independent and shareable components. When sharing components between projects, testing serves as a way to both validate that a component behaves as expected and that it is independent and reusable (otherwise it would show to be very difficult to test).

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React components shared from different projects to Bit.dev (using Bit)

When it comes to testing React components, one of the most popular testing frameworks is Enzyme. But if you start a brand new project using thecreate-react-appcommand-line tool, what you would see is the React Testing Library (RTL). It’s not just another testing utility. This library promotes a different way of testing React components. If we take a closer look, it makes it much easier to test these components.

1. The challenge with Enzyme

Let’s have a look a the challenges with the current testing approach using a practical example.

Just imagine, you write your unit tests based on CSS class selectors. In a later stage, a refactoring happens, and bam !!! all your tests are failing now.

The same thing happens when you depend on props and state in your tests. Here the tests are more tightly coupled with implementation details. Hence, it becomes less maintainable.

react-testing-library web-development react javascript front-end-development

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