[I wanted to know this] Introducing RSpec with Docker + Rails-How to write a top page display confirmation test

background

• Consider introducing RSpec for Rails portfolio creation
• From the introduction to how to write a test to check the display of the top page

1. Install Gem

Add rspec for Rails and factory_bot gem to Gemfile

Gemfile

group :development, :test do
  gem "rspec-rails"
  gem "factory_bot_rails"
end

Rebuild with Docker

docker-compose build

2. Introduction of rspec

Introduce rspec to Rails app with the following command

$ bundle exec rails generate rspec:install
      create  .rspec
      create  spec
      create  spec/spec_helper.rb
      create  spec/rails_helper.rb

3. Definition of rspec generation file

• The configuration file is config/application.rb
• If false is added, unnecessary test files will not be created.

config/application.rb

config.generators do |g|
  g.test_framework :rspec, 
        #Write unnecessary test files with false as shown below
        view_specs: false, 
        helper_specs: false, 
        controller_specs: false, 
        routing_specs: false
end

4. Test View

Create rspec for View test

rails g rspec:view Homes

However, with this alone, only the folder /spec/views/homes/ will be created.

File creation for testing

Create index.html.erb_spec.rb under /spec/views/homes/ and write the following

ruby:/spec/views/homes/index.html.erb_spec.rb

require 'rails_helper'

RSpec.describe "homes/index", type: :view do
  it 'should display top page' do
    visit "/"
    expect(page).to have_content 'Strained'
  end
end

The following supplement

• visit "/": transition to root
• expect (page) .to have_content'string': Make sure there is a "string" on the current display page

Test run

$ rspec

homes/index
  should display top page

Finished in 24.64 seconds (files took 7.02 seconds to load)
1 example, 0 failures

0 failures, so the test succeeded

When RSpec gets angry with "No Method Error: undefined method` visit'for ~ "

• Error that visit cannot be used
• Add to the following file.
• The detailed reason is described below, so please refer to it.
  • https://qiita.com/terufumi1122/items/aefd6c965e9e946efc3b

spec/spec_helper.rb

...Abbreviation

require 'capybara/rspec'

RSpec.configure do |config|
  config.include Capybara::DSL #Postscript

...Abbreviation

reference

• https://qiita.com/Ushinji/items/522ed01c9c14b680222c
• https://qiita.com/terufumi1122/items/aefd6c965e9e946efc3b