Introduction and background
React is maintained by Facebook, along with a worldwide community of companies and individual developers. It is great for fetching data that changes rapidly and which needs to be recorded and is therefore used as a base in the development of mobile apps and single-page applications.
In simple words, React allows developers to create web applications that are capable of changing data without having to reload the page. The main advantages that React offers include ease of use, simplicity, and scalability. It is also very fast, making it highly efficient.
When developers work on a React app, they often play with state and props to make their apps more interactive and appealing. During development, everything may seem to work fine, but in many cases, the app faces issues once it is rolled out into the market when it is used by real people in the real world. This is because, oftentimes, some of the use cases of the app fail.
When you develop a web application, and you don’t run any test, it means that the beta testers will be the users in the real world, which is extremely risky. Besides, if your app fails, you cannot blame others for not trusting an untested code.
Unit testing of apps is required for the following reasons –
- To ensure that each part of the program is correct individually.
- To check out input validation logic and data transformation.
- To check any isolated operation.
- It helps in writing a test-driven approach.
- Make sure the right things render when they are meant to.
So, Jest is used as the test runner, assertion library, and mocking library, while Enzyme is used to provide additional testing utilities to interact with elements.