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We highly recommend working in the style of test-driven development when creating probot apps. It is frustrating to constantly create real GitHub events in order to test an app. Redelivering webhooks is possible and can be accessed in your app's settings page under the Advanced tab. We do offer the above documented simulate method to help make this easier; however, by writing your tests first, you can avoid repeatedly recreating actual events from GitHub to check if your code is working.

For our testing examples, we use jest, but there are other options that can perform similar operations. Here's an example of creating an app instance and mocking out the GitHub API:

const { Application } = require('probot')
// Requiring our app implementation
const myProbotApp = require('..')

const issuesOpenedPayload = require('./fixtures/issues.opened.json')

describe('My Probot app', () => {
  let app, github

  beforeEach(() => {
    app = new Application()
    // Initialize the app based on the code from index.js
    // This is an easy way to mock out the GitHub API
    github = {
      issues: {
        createComment: jest.fn().mockReturnValue(Promise.resolve({}))
    // Passes the mocked out GitHub API into out app instance
    app.auth = () => Promise.resolve(github)

  test('creates a comment when an issue is opened', async () => {
    // Simulates delivery of an issues.opened webhook
    await app.receive({
      name: 'issues.opened',
      payload: issuesOpenedPayload

    // This test passes if the code in your index.js file calls `context.github.issues.createComment`

A good testing example from update-docs can be found here, and another one from owners can be found here.

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