Getting Started with Jest
Last Updated: May 10, 2024
Install the jest package as dev dependency:
npm install --save-dev jest
In the package.json, under the scripts key, change the value for the test key to jest:
"scripts": {
"test": "jest"
},To make a test file, use the naming convention index.test.js if you were writing tests for index.js.
In the index.test.js file, writing tests will use the convention:
test("test description", testFunction);Here's an example of a test for a function sum:
test("Adds 1 + 2 to equal 3", () => {
expect(sum(1, 2)).toBe(3);
});