added missing gem and configuration for code coverage

Gemfile

@@ -64,3 +64,4 @@ gem 'em-websocket'
 
 # code coverage
 gem 'simplecov'
+gem 'simplecov-rcov'

test/test_helper.rb

@@ -2,12 +2,14 @@ ENV["RAILS_ENV"] = "test"
 require File.expand_path('../../config/environment', __FILE__)
 require 'rails/test_help'
 require 'simplecov'
+require 'simplecov-rcov'
 
 class ActiveSupport::TestCase
   # Setup all fixtures in test/fixtures/*.(yml|csv) for all tests in alphabetical order.
   #
   # Note: You'll currently still have to declare fixtures explicitly in integration tests
   # -- they do not yet inherit this setting
+  SimpleCov.formatter = SimpleCov::Formatter::RcovFormatter
   SimpleCov.start
   fixtures :all