Book Image

RSpec Essentials

By : Mani Tadayon
Book Image

RSpec Essentials

By: Mani Tadayon

Overview of this book

This book will teach you how to use RSpec to write high-value tests for real-world code. We start with the key concepts of the unit and testability, followed by hands-on exploration of key features. From the beginning, we learn how to integrate tests into the overall development process to help create high-quality code, avoiding the dangers of testing for its own sake. We build up sample applications and their corresponding tests step by step, from simple beginnings to more sophisticated versions that include databases and external web services. We devote three chapters to web applications with rich JavaScript user interfaces, building one from the ground up using behavior-driven development (BDD) and test-driven development (TDD). The code examples are detailed enough to be realistic while simple enough to be easily understood. Testing concepts, development methodologies, and engineering tradeoffs are discussed in detail as they arise. This approach is designed to foster the reader’s ability to make well-informed decisions on their own.
Table of Contents (17 chapters)
RSpec Essentials
About the Author
About the Reviewers

Configuration and testability

In our test and application code throughout this book, we've seen many examples of configurations set by environment variables. Here are some examples to refresh our memory:

  • In Chapter 3, Taking Control of State with Doubles and Hooks and Chapter 5, Simulating External Services, Redis was configured using ENV['WQ_REDIS_URL']

  • In Chapter 5, Simulating External Services, network connectivity in specs was set with ENV['ALLOW_NET_CONNECT']

  • In Chapter 6, Driving a Web Browser with Capybara and Chapter 7, Building an App from the Outside In with Behavior-Driven Development, the browser used to run e2e tests with Capybara was set with ENV['BROWSER']

  • In Chapter 8, Tackling the Challenges of End-to-end Testing, the Sinatra environments and authentication secret were set using ENV['SINATRA_ENV'] and ENV['JWT_SECRET']

Using environment variables in this way gave us powerful options when running our app and its tests while maintaining a clean separation between code, tests...