
Full-Stack React, TypeScript, and Node
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Unit testing is a very important part of development. These days, no large projects will be written without some level of unit testing. The purpose of tests is to ensure that your code is always working correctly and doing the expected things. This is especially true when code is modified, that is, refactored. In fact, it is probably more difficult to change existing complex code than it is to create brand-new code. Unit testing can prevent breaking existing code during refactoring. But if code does break, it can also help pinpoint the exact place where code no longer works so it can be fixed quickly.
In React, previously, there were two main testing libraries that were commonly used: Jest and Enzyme. Jest is the main testing library that provides base calls such as assertions to check for specific values and wrapper functions to help set up tests. Enzyme has a set of helpers that allows the testing of React components in concert with...