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

Serving static files using Rack middleware

Middleware is one of the most useful tools in Rack. With middleware, we can create an intermediate mini-application that receives an HTTP request before our main web app to do some work based on the request's headers, body, and HTTP method.

The term "do some work" is very vague. Indeed, we can do just about anything with Rack middleware. Here we are simply going to serve static files using the Rack::Static middleware that comes with Rack.

In our simple example, we started Rack from within our app file, using That's not usually how Rack apps are configured. Normally there is a separate file to manage the start of the Rack application. By convention, this file is always called, although it is a normal Ruby file. In our case, we will have the following code in

require 'bundler/setup'
require 'rack/builder'

require_relative 'dummy_app'

NoBackendTodoApp = do
  # Serve all requests to...