examples/404/test.js

var app = require('./app');
var request = require('supertest').agent(app.listen());

describe('404', function() {
  describe('when GET /', function() {
    it('should return the 404 page', function(done) {
      request
      .get('/')
      .expect(404)
      .expect(/Page Not Found/, done);
    });
  });
});