Refactor Gemfile (Offense).

Gemfile

 source 'https://rubygems.org'
 
-gem 'rake', '>= 10.4.2', :require => false
-gem 'activerecord', '>= 4.2.5', :require => false
+gem 'rake', '>= 10.4.2', require: false
+gem 'activerecord', '>= 4.2.5', require: false
 
 group :development do
-  gem 'mg', :require => false
+  gem 'mg', require: false
   gem 'bump'
   platforms :mri do
-    gem 'yard', :require => false
+    gem 'yard', require: false
   end
 end
 
 group :development, :test do
-  gem 'rspec', :require => false
-  gem 'guard-rspec', :require => false
-  gem 'terminal-notifier-guard', :require => false
+  gem 'rspec', require: false
+  gem 'guard-rspec', require: false
+  gem 'terminal-notifier-guard', require: false
+  gem 'simplecov', require: false
 
   platforms :mri do
-    gem 'pry', :require => false
-    gem 'pry-coolline', :require => false
+    gem 'pry', require: false
+    gem 'pry-coolline', require: false
   end
 end
 
 group :test do
-  gem 'wrong', :require => false
-  gem 'files', :require => false
+  gem 'wrong', require: false
+  gem 'files', require: false
 end

spec/spec_helper.rb

+require 'simplecov'
+SimpleCov.start
+
 require 'rubygems'
 require 'bundler'
 Bundler.setup