RSpec Essentials. Develop testable, modular, and maintainable Ruby software for the real world using RSpec Tychy

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. Spis treści: 1. Exploring testability from unit tests to behavior-driven development2. Specifying behavior with examples and matchers3. Manipulating state with doubles and hooks4. Optimizing development with setup and support code5. Simulating external services with VCR6. Driving web UIs with Capybara7. Building a real app with BDD from the outside in8. Tackling the challenges of end-to-end testing9. Verifying environments in development and production10. BDD for the rest of us