Run RSpec for more than one Ruby version using single command

I was looking for a way to run 'rake spec' for all ruby versions.

So far I wrote this code in Rakefile but it doesn't work:

RUBIES = ['ruby-2.0.0', 'ruby-2.1.1', 'ruby-2.2.1']

RUBIES.each do |ruby_v|
  sh "rvm use #{ruby_v}"
  RSpec::Core::RakeTask.new(:spec)
end

Any ideas how may I accomplish this?

It would be great if I could pass down arguments specifying whether I want to run the tests for a single ruby version or for all.