Nodejs Express - unit testing/integration tests with Jest

2h 48m 43s
English
Paid
April 29, 2024

Learn how to write a full CRUD REST API with Nodejs, Express and Jest using the test-driven development method! TDD is becoming more and more of standard, and for good reasons! With TDD, you can feel more safe and secure that any changes you make are not breaking existing functionality in your applications. Manual tests cannot be sustainable in large applications, or even medium applications. Plus, they're incredibly tedious.

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Without TDD... well, you know the story. You try to add functionality while trying to touch the existing code as little as possible, because you don't want to break things unintentionally..

With TDD you won't be scared to make big refactors in your code to clean up messy code, you will know quickly if you've broken any existing functionality!

I'll show you step-by-step how to create a REST API with Express with unit tests and integration tests using the Jest test framework. There's going to be lots of opportunities for you to work on your own and do some exercises as well for optimal learning!

If you have any questions or suggestions to the course, feel free to message me anytime, I love interacting with my students!

Who this course is for:
  • Students somewhat familiar with Nodejs who wants to learn how to make production-ready software with TDD
Requirements:
  • Basic JavaScript ES6
  • Some familiarity with Nodejs Express is a plus

What you'll learn:

  • Learn how to make unit tests
  • Learn how to make integration tests
  • Learn how to create a Express REST API from scratch
  • Learn how to build a Express REST API with test-driven development
  • Learn how to mock Mongoose models in Nodejs with Jest
  • Learn how to use Jest with TDD to build a REST API
  • Learn how to use MongoDB with Mongoose together with Jest tests
  • Learn how to write tests for error handling

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# Title Duration
1 Initialising project 01:19
2 Hello World Express REST API in less than 5 mins! 03:51
3 CRUD Methods we are going to build the TDD-way in REST 01:31
4 Short intro to Jest + How to install Jest in our project 00:40
5 Our first test with Jest and Express REST API 03:56
6 Making our first test with Jest + Express REST API pass! 01:17
7 Make Jest run automatically on file changes 01:22
8 Defining a data model for our Todo items with Mongoose 03:28
9 Using jest.fn to mock our Mongoose model functions 04:05
10 Making our test with Jest mock model pass 01:41
11 How to configure Jest test environment 01:29
12 How to mock Request and Response objects in Express API 03:23
13 Writing test with mock Request object and making it pass! 02:46
14 Using beforeEach in Jest tests 01:18
15 Testing if response code is 201 and response is sent 02:37
16 Test if response is sending back JSON body 04:48
17 Creating our first integration test with Supertest and Jest 06:36
18 How to make our Express app ready for integration testing 01:50
19 Creating our Express Router 03:16
20 How to debug tests in Jest 02:09
21 Setting up Express JSON request body middleware 01:01
22 Fix for address already in use error 01:05
23 Making our controller function use async/await 03:01
24 Setting up our MongoDB database in the cloud! 02:04
25 Creating a MongoDB database user 01:25
26 Connect to MongoDB database with Mongoose 03:18
27 Modify our unit tests to use async/await 03:30
28 Creating a server.js for running our Express REST API manually 02:09
29 Manual Testing with Postman 03:06
30 Oops! We're missing error handling! 02:56
31 Unit tests for error handling 03:17
32 Making our error handling unit test PASS 00:55
33 Creating a integration test for error handling 01:42
34 Manual test for error handling 01:15
35 Making a test for errors returning JSON body 00:48
36 Create middleware to parse errors in JSON 02:31
37 Making all of our tests pass and final manual test! 02:03
38 Intro + first test exercise 01:27
39 Making first test for getTodos pass 01:37
40 Test if TodoModel.find is called 03:23
41 Test if response is being sent back correctly 04:34
42 Test for error handling 03:48
43 Integration test for GET /todos 03:59
44 Manual test with Postman 00:57
45 Intro + Getting first test done 02:43
46 Creating mock function TodoModel.findById and test for calls 03:15
47 Exercise! Make test for response and make test pass! 01:44
48 Solution to response testing with getById() 04:20
49 Error handling unit test 02:54
50 If TodoModel could not be found in database 02:31
51 Integration test for GET /todos/:todoId 03:58
52 404 Integration test + final manual tests 03:08
53 Intro to PUT method and first test 01:07
54 Test if TodoModel.findByIdAndUpdate is called 04:50
55 Test if PUT response is sent back 03:07
56 Test HTTP PUT error handling 02:18
57 HTTP PUT 404 test 02:10
58 HTTP PUT Integration test 03:59
59 Using Jest.mock instead of multiple Jest.fn + Intro to final challenge! 02:59
60 Unit tests for HTTP Delete method 08:15
61 Integration test for HTTP Delete Method + manual test + you are awesome!! 06:12

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