Add initial spec test

.fixtures.yml

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+fixtures:
+  symlinks:
+    "horizon": "#{source_dir}"

.gemfile

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+source :rubygems
+
+puppetversion = ENV.key?('PUPPET_VERSION') ? "= #{ENV['PUPPET_VERSION']}" : ['>= 2.7']
+gem 'puppet', puppetversion
+gem 'puppetlabs_spec_helper', '>= 0.1.0'

Rakefile

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+require 'puppetlabs_spec_helper/rake_tasks'

spec/classes/horizon_init_spec.rb

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+require 'spec_helper'
+
+describe 'horizon' do
+  let :params do
+    {
+      'cache_server_ip' => '10.0.0.1'
+    }
+  end
+
+  describe 'when running on redhat' do
+    let :facts do
+      {
+        'osfamily' => 'RedHat'
+      }
+    end
+
+    it {
+      should contain_service('httpd').with_name('httpd')
+    }
+  end
+
+  describe 'when running on debian' do
+    let :facts do
+      {
+        'osfamily' => 'Debian'
+      }
+    end
+
+    it {
+      should contain_service('httpd').with_name('apache2')
+    }
+  end
+end

spec/spec_helper.rb

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+require 'puppetlabs_spec_helper/module_spec_helper'