Setting up the simplecov test Coverage gem in rails 4.
# (Note run be rake spec after bundling to get coverage file to show)
# gemfile
gem 'simplecov', :require => false, :group => :test
#.gitignore
coverage
# /spec/spec_helper.rb
require 'simplecov'
SimpleCov.start 'rails' do
add_filter '/test/'
add_filter '/config/'
add_group 'Controllers', 'app/controllers'
add_group 'Models', 'app/models'
add_group 'Helpers', 'app/helpers'
add_group 'Libraries', 'lib'
end