Rakefile

require 'bundler'
Bundler::GemHelper.install_tasks

require 'rspec/core/rake_task'
RSpec::Core::RakeTask.new(:spec)

task :default => :spec

begin
  require 'yard'
  YARD::Rake::YardocTask.new
rescue LoadError
  task :yard do
    abort 'YARD is not available. In order to run yard, you must: gem install yard'
  end
end