Rakefile for your puppet modules.

Gemfile

source :rubygems

gem 'rake'
gem 'rspec', '>2'
gem 'rspec-puppet'
gem 'puppetlabs_spec_helper'

## Optionally use puppet-lint for style checks.
#gem 'puppet-lint'

# For testing puppet 2.7 series.
gem 'puppet',  '~>2.7.0'
# gem 'puppet' # for testing the latest

Rakefile

require 'rake'
require 'rspec/core/rake_task'

desc "Run all RSpec code examples"
RSpec::Core::RakeTask.new(:rspec) do |t| 
  t.rspec_opts = File.read("spec/spec.opts").chomp || ""
end

SPEC_SUITES = (Dir.entries('spec') - ['.', '..','fixtures']).select {|e| File.directory? "spec/#{e}" }
namespace :rspec do
  SPEC_SUITES.each do |suite|
    desc "Run #{suite} RSpec code examples"
    RSpec::Core::RakeTask.new(suite) do |t| 
      t.pattern = "spec/#{suite}/**/*_spec.rb"
      t.rspec_opts = File.read("spec/spec.opts").chomp || ""
    end 
  end 
end
task :default => :rspec

## So you have puppet-lint? Allow me to use it for you.
begin
  if Gem::Specification::find_by_name('puppet-lint')
    require 'puppet-lint/tasks/puppet-lint'
    PuppetLint.configuration.ignore_paths = ["spec/**/*.pp", "vendor/**/*.pp"]
    PuppetLint.configuration.log_format = '%{path}:%{linenumber}:%{KIND}: %{message}'
    task :default => [:rspec, :lint]
  end 
rescue Gem::LoadError
end