test: Setup coverage

.gitignore

@@ -6,6 +6,7 @@
 /Gemfile.lock
 
 /_misc/
+/coverage/
 /spec/dummy/db/*.sqlite3*
 /spec/dummy/log/
 /spec/dummy/storage/

Gemfile

@@ -34,6 +34,7 @@ gem 'cuprite'
 gem 'rspec_junit_formatter'
 gem 'rspec-rails'
 gem 'rspec-retry'
+gem 'simplecov', require: false
 
 # Linters
 gem 'fasterer'

spec/rails_helper.rb

@@ -4,6 +4,9 @@ require_relative 'spec_helper'
 
 ENV['RAILS_ENV'] = 'test'
 
+require 'simplecov'
+SimpleCov.start 'rails'
+
 require File.expand_path('dummy/config/environment.rb', __dir__)
 
 abort('The Rails environment is running in production mode!') if Rails.env.production?