Book Image

Deno Web Development

By : Alexandre Portela dos Santos
Book Image

Deno Web Development

By: Alexandre Portela dos Santos

Overview of this book

Deno is a JavaScript and TypeScript runtime with secure defaults and a great developer experience. With Deno Web Development, you'll learn all about Deno's primitives, its principles, and how you can use them to build real-world applications. The book is divided into three main sections: an introduction to Deno, building an API from scratch, and testing and deploying a Deno application. The book starts by getting you up to speed with Deno's runtime and the reason why it was developed. You'll explore some of the concepts introduced by Node, why many of them transitioned into Deno, and why new features were introduced. After understanding Deno and why it was created, you will start to experiment with Deno, exploring the toolchain and writing simple scripts and CLI applications. As you progress to the second section, you will create a simple web application and then add more features to it. This application will evolve from a simple 'hello world' API to a web application connected to the database, with users, authentication, and a JavaScript client. In the third section, the book will take you through topics such as dependency management, configuration and testing, finishing with an application deployed in a cloud environment. By the end of this web development book, you will become comfortable with using Deno to create, maintain, and deploy secure and reliable web applications.
Table of Contents (15 chapters)
1
Section 1: Getting Familiar with Deno
5
Section 2: Building an Application
10
Section 3: Testing and Deploying

Testing the application together with the API client

When you provide an API client to your users, you have the responsibility of making sure it works flawlessly with your application. One of the ways to guarantee this is by having a complete test suite, one that not only tests the client on its own but also tests its integration with the API. Here we'll take care of the latter.

We'll use one feature of the API client and create a test that makes sure it's working. Once again, you'll notice some similarities between these and the tests we wrote at the end of the previous section. We'll replicate the logic from the previous tests, but this time we'll use the client. Let's get started:

  1. Inside the same src/index.test.ts file, create a new test for the login functionality:
    Deno.test("it returns user and token when user logs in
      with the client", async () => {})

    For this test, we know that we'll need to get access...