[RUBY] Rails beginners tried to get started with RSpec

at first

Now that I've managed to complete the Rails tutorial, I'd like to introduce RSpec. First, I will introduce RSpec itself and the frameworks that accompany it.

What is RSpec in the first place?

RSpec is a testing framework for behavior-driven development in Ruby (wikipedia excerpt)

Behavior-driven development seems to be a development method in which the behavior is created first and the code is written later. In other words, you create something like a specification that describes the operation in advance, and implement the function according to it. It may be more like "writing a specification" than "writing a test".


capybara is a testing framework that has been included since Rails 5.1. By combining with RSpec, it will automatically perform the browser operation that people actually check manually.


FactoryBot is a gem that supports the creation of test data. There is a similar thing called Fixture that is included in the Rails standard for creating test data. Fixture can be described in YAML format with a structure similar to a database, but it is not good at complicated data control. On the other hand, Factory Bot makes it easier to control the state and relationships of data by using ActiveRecord callbacks. I interpreted Fixture as cutting out a scene from the database and FactoryBot as describing the movement of the data. If you make a mistake, please point it out.

Preparing RSpec description

First, add a gem called rspec-rails to the test of the Gemfile.


gem 'rspec-rails'
$ bunble

After the gem installation is complete, run the following command.

$ rails g rspec:install

This completes the installation of RSpec itself. It's easy.

Capybara settings

Next, we will configure the settings for Capybara to be used in RSpec.


require 'capybara/rspec'

RSpec.configure do |config|
  config.before(:each, type: :system) do
    config.include Capybara::DSL
    config.include FactoryBot::Syntax::Methods
    driven_by :selenium_chrome_headless

This time, I will use Headless Chrome as the browser with system spec, so I set selenium_chrome_headless.

Introducing FactoryBot

To install FactoryBot, describe it in the Gemfile as follows.


gem 'factory_bot_rails'
$ bundle

This completes the introduction of FactoryBot.

Next, I would like to touch on how to write RSpec, but it seems to be long, so I will do it next time.

The content is simple in the first post, but I hope you will read it again next time.

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