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

Configuring RSpec to run a feature file

Let's have a look now at spec/feature_helper.rb, which will load all of the setup code, helpers, and custom matchers. This is what that file contains:

require_relative 'config/common'
require_relative 'config/capybara'
require_relative 'helpers/web_input_helpers'
require_relative 'helpers/custom_matchers'

It's just a little wrapper that pulls in four different files. We've kept everything nice and clean by using separate files for each concern. This will help keep our RSpec code maintainable and will make it easier to follow changes as our feature evolves over the course of this and the following chapter.

We have first a little file called spec/config/capybara.rb with some basic RSpec configuration:

RSpec.configure do |config|
  config.color = true

Let's look at the next file that we load, spec/config/capybara.rb:

require 'capybara/rspec'

Capybara.default_driver = :selenium
if ENV['APP_HOST'] == 'local'
  puts 'Booting a local server using config...