test: 💍 RSpec を導入した (#6)

.rspec

@@ -0,0 +1 @@
+--require spec_helper --format documentation

Gemfile

@@ -10,5 +10,6 @@ gem 'sqlite3'
 
 group :development, :test do
   gem 'debug', platforms: %i[mri mingw x64_mingw]
+  gem 'rspec-rails', require: false
   gem 'rubocop-rails', require: false
 end

Gemfile.lock

@@ -75,6 +75,7 @@ GEM
     debug (1.5.0)
       irb (>= 1.3.6)
       reline (>= 0.2.7)
+    diff-lcs (1.5.0)
     digest (3.1.0)
     erubi (1.10.0)
     globalid (1.0.0)
@@ -152,6 +153,23 @@ GEM
     reline (0.3.1)
       io-console (~> 0.5)
     rexml (3.2.5)
+    rspec-core (3.11.0)
+      rspec-support (~> 3.11.0)
+    rspec-expectations (3.11.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.11.0)
+    rspec-mocks (3.11.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.11.0)
+    rspec-rails (5.1.2)
+      actionpack (>= 5.2)
+      activesupport (>= 5.2)
+      railties (>= 5.2)
+      rspec-core (~> 3.10)
+      rspec-expectations (~> 3.10)
+      rspec-mocks (~> 3.10)
+      rspec-support (~> 3.10)
+    rspec-support (3.11.0)
     rubocop (1.30.1)
       parallel (~> 1.10)
       parser (>= 3.1.0.0)
@@ -188,6 +206,7 @@ DEPENDENCIES
   debug
   puma
   rails
+  rspec-rails
   rubocop-rails
   sqlite3
 

spec/misc/foo_spec.rb

@@ -0,0 +1,7 @@
+require 'rails_helper'
+
+RSpec.describe do
+  it 'Bar' do
+    expect(1 + 1).to eq 2
+  end
+end

spec/rails_helper.rb

@@ -0,0 +1,20 @@
+require 'spec_helper'
+ENV['RAILS_ENV'] ||= 'test'
+require_relative '../config/environment'
+
+abort("The Rails environment is running in production mode!") if Rails.env.production?
+require 'rspec/rails'
+
+begin
+  ActiveRecord::Migration.maintain_test_schema!
+rescue ActiveRecord::PendingMigrationError => e
+  puts e.to_s.strip
+  exit 1
+end
+
+RSpec.configure do |config|
+  config.fixture_path = "#{::Rails.root}/spec/fixtures"
+  config.use_transactional_fixtures = true
+  config.infer_spec_type_from_file_location!
+  config.filter_rails_from_backtrace!
+end

spec/spec_helper.rb

@@ -0,0 +1,11 @@
+RSpec.configure do |config|
+  config.expect_with :rspec do |expectations|
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  config.mock_with :rspec do |mocks|
+    mocks.verify_partial_doubles = true
+  end
+
+  config.shared_context_metadata_behavior = :apply_to_host_groups
+end