Book Image

Rapid Application Development with AWS Amplify

By : Adrian Leung
Book Image

Rapid Application Development with AWS Amplify

By: Adrian Leung

Overview of this book

AWS Amplify is a modern toolkit that includes a command line interface (CLI); libraries for JS, iOS, and Android programming; UI component libraries for frameworks like React, Angular, and Vue.js for web development, and React Native and Flutter for mobile development. You'll begin by learning how to build AWS Amplify solutions with React and React Native with TypeScript from scratch, along with integrating it with existing solutions. This book will show you the fastest way to build a production-ready minimum viable product (MVP) within days instead of years. You'll also discover how to increase development speed without compromising on quality by adopting behavior-driven development (BDD) and Cypress for end-to-end test automation, as well as the Amplify build pipeline (DevOps or CI/CD pipeline) to ensure optimal quality throughout continuous test automation and continuous delivery. As you advance, you'll work with React to determine how to build progressive web apps (PWAs) with Amplify and React Native for cross-platform mobile apps. In addition to this, you'll find out how to set up a custom domain name for your new website and set up the AWS Amplify Admin UI for managing the content of your app effectively. By the end of this AWS book, you'll be able to build a full-stack AWS Amplify solution all by yourself.
Table of Contents (14 chapters)
Section 1: Getting Ready
Section 2: Building a Photo Sharing App
Section 3: Production Readiness

Writing test cases as step definitions with TypeScript

In this section, we will show you how to create step definitions to fulfil the feature file that we created in the previous section. A step definition is the actual implementation of the executable Specification by Examples. This means that we have the User Story in plain English so that both the business and technical teams will understand it. Then, we fulfil it with the code of the actual app and ensure that each step of the test case will pass each user scenario. The recommended procedure for BDD would be as follows:

  1. Come up with a User Story with Specification by Examples (SBE) first.
  2. The development team will pick up the executable specification and run it. The console will tell you that there is a failed test case that we need to implement for the step definitions.
  3. Write some code for the actual app that can pass the test case.
  4. Write the step definitions and rerun the tests.
  5. Refactor the code of the...