Writing Tests and Assertions

This video tutorial covers testing Node.js applications, focusing on creating and testing a function to calculate tips. It introduces Jest's expect function for assertions and demonstrates refactoring code with default values. The tutorial emphasizes writing effective test cases and using Jest's features to simplify testing processes.

How can you refactor a function without changing its behavior?

What is the purpose of setting a default value for the tip percentage in the function?

How do you handle multiple test cases for different scenarios in your code?

What are the benefits of using an assertion library like Jest in your tests?