How to use the before function from mocha

Find comprehensive JavaScript mocha.before code examples handpicked from public code repositorys.

mocha.before is a function in the Mocha testing framework that allows you to run a setup function before executing any tests in a test suite.

common-utilities-test.js

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const testHelper = require('./test-helper');


describe('general utilities', function () {
  let utils;


  before(function (done) {
    testHelper.install();
    requirejs(['utils/common-utilities'],
      function (equality_utils) {
        utils = equality_utils;

publish.test.js

GitHub: eclass/semantic-release-docker

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const mock = require('mock-require')
const { createContext, createConfig, DockerMock, tags } = require('./shared')


describe('Publish', () => {
  let publish
  before(() => {
    tags.splice(0, tags.length)
    mock('dockerode', DockerMock)
    publish = require('../src/publish')
  })

+ 2 other calls in file

How does mocha.before work?

When you use mocha.before in your test suite, Mocha will execute the setup function defined inside mocha.before before running any test cases in that suite. This setup function can be used to perform any necessary setup tasks, such as creating test data, connecting to a database, or initializing variables. Once the setup function is complete, Mocha will proceed to run the test cases in the suite.

readme.md?plain=1

GitHub: applitools/docker-compose-mocha

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After using our package's code to fire up an environment as defined in the Yaml file you will have 3 services up and running
in your computer as Docker containers. all of them attaching a random TCP/IP port to your host computer (IP 127.0.0.1 / 0.0.0.0)

Consider the following Javascript code which is supposed to be placed in your end to end test suite setup.js file
(most preferably in your before() block)

```js

const {before, after} = require('mocha');

movieService.test.js

GitHub: jamangueira7/locacao-fita-nodejs-tdd

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describe('MovieService Suite Tests', () => {


    let movieService = {};
    let sandbox = {};


    before(async () => {
        movieService = new MovieService({
            repository: movieRepository,
            categoryRepository: categoryRepository,
        });

Ai Example

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const assert = require("assert");

describe("Array", function () {
  let testArray;

  before(function () {
    // This code will run before any test cases in this suite
    testArray = [1, 2, 3];
  });

  describe("#indexOf()", function () {
    it("should return -1 when the value is not present", function () {
      assert.equal(testArray.indexOf(4), -1);
    });
  });
});

In this example, we have a test suite for an array with one test case that checks if the indexOf method returns -1 when the value is not present. We also have a mocha.before function that sets up the testArray variable with some initial values. This function will run before the test case is executed, ensuring that the array is set up correctly for the test.

api.test.js

GitHub: paulosobral/erikwendeljsexpert

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const supertest = require('supertest')
const assert = require('assert')


describe('API Suite test', () => {
    let app
    before((done) => {
        app = require('./api')
        app.once('listening', done)
    })
    after(done => app.close(done))

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