Unit Testing in Node.js with Jest - e2e Testing & more

Install the essential tools for this course, including Visual Studio Code, Postman, and MongoDB community server. Learn to use built-in terminals on Windows and Mac to get started.

Access the project source code from the course page resources zip and the GitHub repository, with per-section branches covering unit testing basics and test driven development for the jobs API.

Explore jest, a beginner-friendly JavaScript testing framework maintained by meta, used for unit testing in Node.js. The lecture explains what jest is, its docs, and concepts like api and globals.

Set up a node project and install jest and types/jest, then write your first unit tests in a __tests__ folder, covering addition, null and defined checks, arrays, and throwing errors.

Learn mocking in unit testing by creating fake implementations and avoiding real databases or third-party calls, using Jest to mock modules and rules like mockResolvedValue and mockImplementation.

Explore the difference between mockImplementation and mockImplementationOnce in Jest, showing how the first call uses a custom implementation while subsequent calls fall back to default during tests.

Use jest spyOn to mock a single crypto.randomBytes method, instead of mocking the entire module, and configure a mock resolved value to return specific bytes.

Group related tests with describe blocks in jest to organize modules such as auth and product, and define individual tests with it or test.

Learn how beforeAll, afterAll, beforeEach, and afterEach run in Jest to manage setup and teardown in unit and e2e tests.

Explore the initial jobs api setup, including cloning the repository, running the server, and testing endpoints, authentication, and CRUD operations for jobs with unit tests.

Master unit testing an express controller by mocking request and response in a node.js jest setup, covering mock bodies, status, and json responses.

Learn to mock hash, user creation, and jwt token in node.js unit tests with jest, isolating the register user function by mocking bcryptjs, mongoose, and helpers.

Learn to unit test the register user workflow in a Node.js Jest setup by mocking requests and responses, validating password hashing, token generation, and user creation with a 201 response.

Explore how to restore mocks with jest.restoreAllMocks after tests, returning all mocked functions to their original values for spies created with jest.spyOn, typically in afterEach.

In this unit test, validate that missing name, email, or password triggers a 400 validation error with message 'please enter all values', using mocked dependencies to test register user flow.

Write a unit test that mocks a duplicate email error (code 11000) and asserts a 400 response with a duplicate email message.

Write unit tests for login validation by simulating missing email or password and asserting a 400 error, using mocks for request and response in Node.js with Jest.

Unit testing in node.js with jest demonstrates handling login errors by mocking user lookup, selecting the password field, and simulating invalid email or password to trigger the error.

Unit testing user login in Node.js with Jest, validating email and password, returning a JWT token, and covering success and error scenarios through mock requests.

Create and configure mocks for the jobs controller tests in a Node.js Jest suite, including mock request, response, and data, then plan the first unit test for fetching jobs.

Explore testing the get all jobs controller with pagination and keyword search in Node.js using Jest, mocking Mongoose methods like find, limit, and skip, and asserting responses.

Learn how to unit test the create job function in a Node.js app using Jest, including mocking dependencies, setting request bodies and user data, and asserting a 201 response.

Learn unit testing in node.js with jest by validating the create job flow, triggering a missing fields error, and asserting a 400 response and error message.

Test the unit for getting a job by id in node.js. Handle not found with 404, return the job when found, and spy on findById with mocks.

Test the get job controller by triggering a cast error on an invalid ID, asserting a 400 response and the message please enter correct ID.

Explore unit testing of a job update in node.js with jest, validating existence and ownership, handling unauthorized errors, and updating the job title via a mocked find-by-id and update flow.

Test the unauthorized error path in the update job controller by mocking request and response and simulating a mismatched user, asserting a 403 error and proper message.

Test the delete job function in the loss controller to ensure it throws an error when the job is not found and returns the deleted job when found.

Explore how auth middleware validates JWT tokens in Node.js, extracting user id from the token and enforcing bearer authorization on protected routes, with unit testing in Jest.

Test the authentication middleware in node.js by simulating a request with a missing authorization header using auth.spec.js, JWT, and the user model, ensuring it returns an error response.

Learn to test missing jwt errors by sending requests with no token or a bearer header without a token, and verify missing jwt and authentication failed responses.

Master unit testing of authentication middleware in Node.js with Jest by mocking jwt verify, decoding the user id, and asserting next is called after validating the authorization header.

Test the user model using Jest, validating required name, email, and password fields with a minimum eight-character password, and verify user creation yields an _id field.

Explore how to test required field validations in a Node.js user model with Jest, including mocking Mongoose validation errors for name, email, and password, and asserting error objects.

Explore unit testing for password validation in node.js, enforcing a minimum eight characters, testing the length error, and validating the error message with a regular expression.

This lecture walks through unit testing node.js utilities with jest, focusing on testing get JWT token by mocking the JWT sign function to return a token and asserting the result.

Unit test sendEmail with nodemailer shows configuring smtp with mail trap, creating transport, and sending mail via a route, then testing with Postman and mocking createTransport and sendMail in Jest.

Examine testing a dedicated AWS S3 service class that uploads images to a bucket, including mock files, Postman verification, and preparing unit tests for the class.

Learn to unit test a Node.js S3 upload by mocking the AWS SDK, stubbing S3 upload and its promise, and validating the upload flow before moving to e2e tests.

Write end-to-end tests for your API by sending requests to the database, validating responses, and installing the necessary packages for e2e testing with an in-memory database.

Set up end-to-end testing for Node.js APIs using supertest and an in-memory MongoDB with mongodb-memory-server, creating a db handler to connect and close the database for isolated tests.

Connect to the Memories database before all tests and close the connection after all tests in a Node.js Jest e2e testing workflow, and verify the connection with a 'connected' log.

Test the register endpoint in a node.js app using jest for end-to-end testing to validate input, handle errors, and verify a token is returned on success, including duplicate email handling.

Learn to write e2e login tests in a Node.js app with Jest, covering missing fields, invalid credentials, and a valid login that returns a token with status 200.

Test how to validate 404 routes in a Node.js app using unit and e2e testing with Jest, confirming not found responses for invalid paths.