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Jest uses "matchers" to let you test values in different ways. This document will introduce some commonly used matchers. For the full list, see the expect API doc.
29 mag 2020 · You SHOULD NOT use jest.mock (moduleName, factory, options) in function scope, it should be used in MODULE scope. Besides, for your case, I don't see any reason to use rewire module. E.g. authenticate.js: const got = require('got'); const authenticate = async (options) => {. let res = 'got';
pnpm add --save-dev jest. Let's get started by writing a test for a hypothetical function that adds two numbers. First, create a sum.js file: function sum(a, b) {. return a + b; } module.exports = sum; Then, create a file named sum.test.js. This will contain our actual test:
The jest command line runner has a number of useful options. You can run jest --help to view all available options. Many of the options shown below can also be used together to run tests exactly the way you want. Every one of Jest's Configuration options can also be specified through the CLI.
15 ott 2019 · These are methods that work in more specific cases than what the Jest official documentation shows. This isn’t strictly a Jest testing guide, the same principles can be applied to any application/tests that need to mock CommonJS or ES Modules. Table of Contents. For Context: types of imports. Modern JavaScript has 2 types of imports:
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31 ago 2018 · CommonJS Modules vs ES Modules. Quirks of hoisting when using mock functions inside of manual mocks. Setup. First we need to install Jest using NPM: npm install --save-dev jest. Then add a...
