probot/test/server.js

const expect = require('expect');
const request = require('supertest');
const createServer = require('../lib/server');

describe('server', function () {
  let server;
  let webhook;

  beforeEach(() => {
    webhook = expect.createSpy().andCall((req, res, next) => next());
    server = createServer(webhook);
  });

  describe('GET /ping', () => {
    it('returns a 200 repsonse', () => {
      return request(server).get('/ping').expect(200, 'PONG');
    });
  });

  describe('webhook handler', () => {
    it('should 500 on a webhook error', () => {
      webhook.andCall((req, res, callback) => callback('webhook error'));
      return request(server).post('/').expect(500);
    });
  });

  describe('with an unknown url', () => {
    it('responds with 404', () => {
      return request(server).get('/lolnotfound').expect(404);
    });
  });
});