How to automate testing a user journey? - node.js

Question

I use NodeJS for the web server and Mocha for testing. I tried this test to ensure that the application can create a user, log it out, and sign it in again:
const request = require('supertest');
const app = require('../app');
const req = request(app);
describe("user journey", function() {
it("tests a user journey (signup, logout, sign in)", function(done) {
let signedInStub = "something only for logged in users";
req
.post("/signup")
.send({
"email": "test#test.com",
"password": "abcd1234"
})
.expect(function(response) {
expect(response.body.includes(signedInStub))
})
.get("/logout")
.expect(function(response) { // <-- Test fails here.
!response.body.includes(signedInStub)
})
.post("/login")
.send({
"email": "test#test.com",
"password": "abcd1234"
})
.expect(function(response) {
response.body.includes(signedInStub)
})
.get("/content/2")
.expect(200, done);
});
});
I run it with mocha --exit test.js and get the error:
1) user journey
tests a user journey (signup, logout, sign in):
TypeError: Cannot read property 'expect' of undefined
How can I test on the command-line that a user can create an account, log out, and log in?

Answer 1

Create an agent and use that across multiple requests to persist the session.
If needed, install chai, which works with supertest, with npm install --save chai. (See here for details about testing in NodeJS with Mocha and Chai.)
If you are using an auth type other than cookies, persist the data in a variable in the same way and send it with each request.
const request = require('supertest');
const app = require('../app');
const { expect } = require('chai')
const User = require('../models/user');
const email = "test#test.com";
describe("user journey", function() {
let req
let signedInStub = "something only for logged in users"
before(function(){
req = request.agent(app)
})
it("should signup a new test#test.com user", async function() {
// Delete this email in case emails are unique in the database.
await User.deleteOne({email: email});
const response = await req.post("/signup")
.send({
"email": email,
"password": "abcd1234"
})
.redirects(1); // optional, in case your back-end code uses a redirect after signing up.
// Log the response so you can track errors, e.g. hidden parameters in the HTML form that are missing from this POST request in code.
console.log(response.text);
expect(response.text).to.include(signedInStub)
})
it("should logout the new user", async function() {
const response = await req.get("/logout")
expect(response.text).not.to.include(signedInStub)
})
it("should login the new user", async function() {
const response = await req.post("/login")
.send({
"email": email,
"password": "abcd1234"
})
expect(response.text).to.include(signedInStub)
})
it("should get the new users content", async function() {
await req.get("/content/2")
.expect(200)
});
});