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  • Book Overview & Buying Nest.js: A Progressive Node.js Framework
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Nest.js: A Progressive Node.js Framework

Nest.js: A Progressive Node.js Framework

By : Greg Magolan, Patrick Housley, Adrien de Peretti, Jay Bell, David Guijarro
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Nest.js: A Progressive Node.js Framework

Nest.js: A Progressive Node.js Framework

By: Greg Magolan, Patrick Housley, Adrien de Peretti, Jay Bell, David Guijarro

Overview of this book

Nest.js is a modern web framework built on a Node.js Express server. With the knowledge of how to use this framework, you can give your applications an organized codebase and a well-defined structure. The book begins by showing how to use Nest.js controllers, providers, modules, bootstrapping, and middleware in your applications. You’ll learn to use the authentication feature of Node.js to manage the restriction access in your application, and how to leverage the Dependency Injection pattern to speed up your application development. As you advance through the book, you'll also see how Nest.js uses TypeORM—an Object Relational Mapping (ORM) that works with several relational databases. You’ll use Nest.js microservices to extract part of your application’s business logic and execute it within a separate Nest.js context. Toward the end of the book, you’ll learn to write tests (both unit tests as well as end-to-end ones) and how to check the percentage of the code your tests cover. By the end of this book, you’ll have all the knowledge you need to build your own Nest.js applications.
Table of Contents (16 chapters)
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Testing

Testing your Nest server will be imperative so that once it is deployed their are no unforseen issure and it all runs smoothly. There are two different kinds of tests you will learn about in this book: Unit Tests and E2E Tests (End-to-end Tests). Unit Testing is the art of testing small snippets or blocks of code, and this could be as granular as testing individual functions or writing a test for a Controller, Interceptor, or any other Injectable. There are many popular unit testing frameworks out there, and Jasmine and Jest are two popular ones. Nest provides special packages, @nestjs/testing specifically, for writing unit tests in *.spec.ts and *.test.ts classes.

E2E Testing is the other form of testing that is commonly used and is different from unit testing only in that it tests entire functionality rather than individual functions or components, which is where the name end-to-end testing came from. Eventually applications will become so large that it is hard to test absolutely every piece of code and endpoint. In this case you can use E2E tests to test the application from beginning to the end to make sure everything works along the way. For E2E testing a Nest application can use the Jest library again to mock up components. Along with Jest you can use the supertest library to simulate HTTP requests.

Testing is a very important part of writing applications and should not be ignored. This is a chapter that will be relevant no matter what language or framework you end up working with. Most large scale development companies have entire teams dedicated to writing tests for the code that is pushed to production applications, and these are called QA developers.

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