Chapter 8: Testing with Node.js

Testing enables you to identify bugs in your code more quickly and efficiently. Test cases should be written to verify that each piece of code is yielding the expected output or results. Tests can act as a form of documentation for the logic of your program.

Unit testing is a specific type of testing where individual components or units of code are tested. Small unit tests provide a granular specification for your program to test against. Ensuring your code base is covered by unit tests aids the development, debugging, and refactoring process by providing a baseline measure of quality that you can work off of. Having a comprehensive test suite can lead to identifying bugs sooner, which can save time and money since the earlier a bug is found, the cheaper it is to fix.

This chapter will introduce several unit testing frameworks. Testing frameworks provide components and utilities such as test runners for running automated tests. The later recipes...