Add SimpleCov for test coverage

Author: Fivell

Gemfile

@@ -11,5 +11,6 @@ group :test do
   gem 'cuprite'
   gem 'puma'
   gem 'rspec-rails', '~> 6.0'
+  gem 'simplecov', require: false
   gem 'sqlite3', '~> 2.0'
 end

spec/rails_helper.rb

@@ -2,6 +2,11 @@
 
 require 'bundler/setup'
 
+require 'simplecov'
+SimpleCov.start do
+  add_filter '/spec/'
+end
+
 ENV['RAILS_ENV'] = 'test'
 
 require_relative 'dummy/test_application'