Building APIs doing TDD in Node and Typescript (and Jest)

Name: Building APIs doing TDD in Node and Typescript (and Jest)
Rating: 3.9 (21 reviews)

A practical example on how to build REST API doing TDD using Nodejs Typescript and jest (and mongodb)

Created byJosep Mir

Last updated 2/2022

English

English [Auto],

What you'll learn

Build REST API in Node and TypeScript
Test with Jest framework
Inside-out approach a.k.a. classicist a.k.a. Chicago school TDD
Test doubles, mocks, spies, stubs, fakes and dummies
Docker
Mongo MongoDB Mongoose
Node Express

Course content

2 sections • 13 lectures • 3h 59m total length

Introduction to the course1:49
Build an api from inside-out with Node, TypeScript, and test-driven development using a testing library, store data in MongoDB, and run integration tests; a crash course for developers with experience.

Problem Presentation5:09
Design a rest API in Node and TypeScript to store and retrieve one-time secrets via a URL. Enforce secrets must be longer than three characters and retrievable only once.
Project Initialization2:14
Initialize the project by creating a TypeScript source folder, adding a Typekit and desk configuration file, and running a test to verify installation turns green.
Test coverage1:05
Learn how to run test coverage using flags, view coverage reports, and prune unnecessary files like a copyright folder, while noting that production code is not tested in this course.
Domain Models10:37
Define the domain model by implementing a secret with length validation and a custom error for too-short secrets, guided by tests and the constructor.
Domain Use Cases24:38
Develop domain use cases for secret management in a node and typescript project. Define interfaces and a secret repository, and test storing, retrieving, and deleting secrets with mocks.
Token Generator Service12:43
Implement a token generator service in a Node and TypeScript API using TDD with Jest, validating tokens longer than ten characters and using Unique ID library with tests and mocks.
Secret Repository (Database)46:37
Implement the secret repository using mongoose, connect to a local MongoDB instance, define secret model and schema, and add tests for get, create, delete operations, including not found errors.
REST Controllers39:10
Build REST controllers in Node and TypeScript, guided by Jest test-driven development, focusing on validation errors, secret retrieval, and proper responses using Express.
Error handler19:13
Implement a robust error handler in a Node and TypeScript API using test-driven development, covering 500 internal server errors, 400 validation errors, and not-found scenarios with user-friendly messages.
Express Application & Integration tests48:20
Build an Express application with endpoints and controllers, then write integration and unit tests to verify secrets, roads, and the API version one. Embrace a Node and TypeScript TDD workflow.
E2E tests with docker21:01
learn how to run end-to-end tests with docker, spinning up a container, seeding the database with secrets, and validating errors and 400 responses in a node typescript workflow.
Recap7:16
recap of building apis with tdd in node and typescript, detailing unit, integration, and end-to-end tests, domain models, use cases, repositories, and a token generator.

Requirements

Familiar with Node and Typescript
Familiar writing tests
Familiar with mongodb

Description

In this course we are going to implement from scratch a REST API in Node using Typescript and testing with Jest, but using Test Driven Development (TDD). During this exercise, we will follow the Inside-out TDD approach also known as classicist or referred also sometimes as Chicago school TDD. We will start from deep inside our application and build our way out until we have meet all the business requirements, being at any time covered by our own tests.

The API we are going to build is a clone of the One Time Secret site. We will create an application that stores our secrets and provides us a URL to access them later, but with the condition that we can access that URL one time only. Whenever we attempt to retrieve the same secret again, hitting the same URL for a second time, we will receive an error. We will use a mongodb as a persistence layer.

At the beginning of this course, we will analyze the business requirements just mentioned before and we will see how we translate that into working and well crafted code. We will see how we design the application and how we implement it, using a TDD approach having all the time our production code under control. We will get some inspiration from DDD, Hexagonal arch and CQRS to design our solution.

Kudos to @Panos for the constructive feedback that helped to make this course better.

Who this course is for:

Developers with certain experience writing code
Developers with certain experience writing tests

Building APIs doing TDD in Node and Typescript (and Jest)

What you'll learn

Explore related topics

Course content

Introduction1 lecture • 2min

Building One Time Secret REST API12 lectures • 3hr 58min

Requirements

Description

Who this course is for: