rake for run all rspec test with rcov.

rspec.rake

require 'rubygems'
require 'rspec/core/rake_task'
require "rspec"

namespace :test do
  desc "Run all specs." 
  Rspec::Core::RakeTask.new(:spec) do |t| 
    t.pattern = 'spec/**/*_spec.rb'
    t.verbose = false 
  end 
  Rspec::Core::RakeTask.new(:coverage) do |t| 
    t.rcov = true  
    t.verbose = true 
    t.rcov_opts =  %[-Ilib -Ispec --exclude "gems/*,features"]
    t.rcov_opts << %[--text-report --sort coverage --html --aggregate coverage.data]
  end 
end 

I create a file in lib/tasks called rspec.rake, and when I want to run all rspec test with coverage I run the command: rake test:coverage