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When you have code that runs asynchronously, Jest needs to know when the code it is testing has completed before moving to another test.

Global methods are functions that are available to any script as they are not methods of any specific object. You can invoke global methods directly just as you would do with any core JavaScript global functions.

SuperTest is a Node.js library for making http requests. SuperTest can be used to test external or internal APIs. With SuperTest we can test both REST and GraphQL APIs.

Jest enables you to test values in different ways by using matchers. We will introduce you to some of the matchers that are commonly used.

In Jest, a matcher function is used with expect to assert something about a value. A matcher can optionally accept an argument which is the correct expected value.

There are many different frameworks for testing JavaScript here we are going to use Jest for testing our doc.