Book Image

End-to-End Web Testing with Cypress

By : Waweru Mwaura
1 (1)
Book Image

End-to-End Web Testing with Cypress

1 (1)
By: Waweru Mwaura

Overview of this book

Cypress is a modern test automation framework for web-based frontend apps. Learning Cypress will help you overcome the shortcomings of conventional testing solutions such as dependency graph problems, the steep learning curve in setting up end-to-end testing packages, and difficulties in writing explicit time waits for your tests. In End-to-End Web Testing with Cypress, you’ll learn how to use different Cypress tools, including time travel, snapshots, errors, and console output, to write fail-safe and non-flaky tests. You’ll discover techniques for performing test-driven development (TDD) with Cypress and write cross-browser tests for your web applications. As you advance, you’ll implement tests for a sample application and work with a variety of tools and features within the Cypress ecosystem. Finally, this Cypress book will help you grasp advanced testing concepts such as visual testing and networking. By the end of this book, you’ll have the skills you need to be able to set up Cypress for any web app and understand how to use it to its full potential.
Table of Contents (17 chapters)
1
Section 1: Cypress as an End-to-End Testing Solution for Frontend Applications
7
Section 2: Automated Tests with the TDD Approach
12
Section 3: Automated Testing for Your Web Application

Cypress assertions

As we learned in the previous section, when writing our first test, assertions exist to describe the desired state of the application. Assertions in Cypress behave like guards to the tests in that they validate that the desired state and the present state are the same. Cypress assertions are unique as they are retried when Cypress commands are running until a timeout is reached or until an element is found.

Cypress assertions originate from the chai, chai-jquery and sinon-chai modules, which come bundled with the Cypress installation. Cypress also allows you to write custom assertions using the Chai plugins. However, in this section, we will focus on the default assertions that come bundled with Cypress, and not on the custom assertions that can be extended as plugins.

We can write Cypress assertions in two ways: either by explicitly defining subjects or by implicitly defining subjects. Cypress recommends implicitly defining subjects in assertions as they are...