Adds basic spec testing, fixes empty string and other Puppet 4 requirements

.fixtures.yml

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+fixtures:
+    symlinks:
+      duo_unix: "#{source_dir}"
+    repositories:
+      stdlib:
+        repo: https://github.com/puppetlabs/puppetlabs-stdlib.git
+        ref: 4.3.2
+    forge_modules:

.gitignore

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+.*.sw?
+pkg
+spec/fixtures
+.rspec_system
+.vagrant
+.bundle
+vendor
+.idea
+.project
+.DS_Store
+

.travis.yml

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+---
+sudo: false
+language: ruby
+bundler_args: --without system_tests
+script:
+  - "bundle exec rake validate"
+  - "bundle exec rake lint"
+  - "bundle exec rake spec SPEC_OPTS='--format documentation'"
+matrix:
+  fast_finish: true
+  include:
+  - rvm: 1.9.3
+    env: PUPPET_GEM_VERSION="~> 3.0" STRICT_VARIABLES="yes" ORDERING="random"
+  - rvm: 2.0.0
+    env: PUPPET_GEM_VERSION="~> 3.0" STRICT_VARIABLES="yes" ORDERING="random"
+  - rvm: 2.1.6
+    env: PUPPET_GEM_VERSION="~> 4.0" STRICT_VARIABLES="yes" ORDERING="random"

CONTRIBUTING.md

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+This module has grown over time based on a range of contributions from
+people using it. If you follow these contributing guidelines your patch
+will likely make it into a release a little quicker.
+
+## Contributing
+
+1. Fork the repo.
+
+2. Run the tests. We only take pull requests with passing tests, and
+   it's great to know that you have a clean slate
+
+3. Add a test for your change. Only refactoring and documentation
+   changes require no new tests. If you are adding functionality
+   or fixing a bug, please add a test.
+
+4. Make the test pass.
+
+5. Push to your fork and submit a pull request.
+
+
+## Dependencies
+
+The testing and development tools have a bunch of dependencies,
+all managed by [bundler](http://bundler.io/) according to the
+[Puppet support matrix](http://docs.puppetlabs.com/guides/platforms.html#ruby-versions).
+
+By default the tests use a baseline version of Puppet.
+
+If you have Ruby 2.x or want a specific version of Puppet,
+you must set an environment variable such as:
+
+    export PUPPET_VERSION="~> 3.2.0"
+
+Install the dependencies like so...
+
+    bundle install
+
+## Syntax and style
+
+The test suite will run [Puppet Lint](http://puppet-lint.com/) and
+[Puppet Syntax](https://github.com/gds-operations/puppet-syntax) to
+check various syntax and style things. You can run these locally with:
+
+    bundle exec rake lint
+    bundle exec rake syntax
+
+## Running the unit tests
+
+The unit test suite covers most of the code, as mentioned above please
+add tests if you're adding new functionality. If you've not used
+[rspec-puppet](http://rspec-puppet.com/) before then feel free to ask
+about how best to test your new feature. Running the test suite is done
+with:
+
+    bundle exec rake spec
+
+Note also you can run the syntax, style and unit tests in one go with:
+
+    bundle exec rake test
+
+## Automatically run the Integration tests
+
+During development of your puppet module you might want to run your unit tests a couple of times. You can use the following command to automate running the unit tests on every change made in the manifests folder.
+
+  bundle exec guard
+
+## Integration tests
+
+The unit tests just check the code runs, not that it does exactly what
+we want on a real machine. For that we're using
+[beaker](https://github.com/puppetlabs/beaker).
+
+This fires up a new virtual machine (using vagrant) and runs a series of
+simple tests against it after applying the module. You can run this
+with:
+
+    bundle exec rake acceptance
+
+If you don't want to have to recreate the virtual machine every time you
+can use `BEAKER_DESTROY=no` and `BEAKER_PROVISION=no`. On the first run you will
+at least need `BEAKER_PROVISION` set to yes (the default). The Vagrantfile
+for the created virtual machines will be in `.vagrant/beaker_vagrant_files`.
+

Gemfile

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+source 'http://rubygems.org'
+
+group :test do
+  if puppetversion = ENV['PUPPET_GEM_VERSION']
+    gem 'puppet', puppetversion, :require => false
+  else
+    gem 'puppet', ENV['PUPPET_VERSION'] || '~> 3.8.0'
+  end
+
+  gem 'rake'
+  gem 'puppet-lint'
+  gem 'rspec-puppet', :git => 'https://github.com/rodjek/rspec-puppet.git'
+  gem 'puppet-syntax'
+  gem 'puppetlabs_spec_helper'
+  gem 'simplecov'
+  gem 'metadata-json-lint'
+  gem 'rspec-puppet-facts'
+
+  gem "puppet-lint-absolute_classname-check"
+  gem "puppet-lint-leading_zero-check"
+  gem "puppet-lint-trailing_comma-check"
+  gem "puppet-lint-version_comparison-check"
+  gem "puppet-lint-classes_and_types_beginning_with_digits-check"
+  gem "puppet-lint-unquoted_string-check"
+  gem 'puppet-lint-resource_reference_syntax'
+  gem 'rspec-puppet-facts'
+end
+
+group :development do
+  gem 'puppet-blacksmith'
+  gem 'guard-rake'
+  gem 'listen', '<= 3.0.6'
+end
+
+group :system_tests do
+  gem "beaker"
+  gem "beaker-rspec"
+  gem "beaker-puppet_install_helper", :require => false
+end