Add a test for duplicate File[] resources for the plugin parent dir

Fixes #155

manifests/plugin.pp

@@ -28,7 +28,6 @@
   }
 
   if (!defined(File[$plugin_dir])) {
-
     if (!defined(File[$plugin_parent_dir])) {
       file { $plugin_parent_dir:
         ensure  => directory,

spec/defines/jenkins_plugin_spec.rb

@@ -3,11 +3,26 @@
 describe 'jenkins::plugin' do
   let(:title) { 'myplug' }
 
-  it { should contain_file('/var/lib/jenkins') }
-  it { should contain_file('/var/lib/jenkins/plugins') }
+  shared_examples 'manages plugins dirs' do
+    it { should contain_file('/var/lib/jenkins') }
+    it { should contain_file('/var/lib/jenkins/plugins') }
+  end
+
+  include_examples 'manages plugins dirs'
   it { should contain_group('jenkins') }
   it { should contain_user('jenkins').with('home' => '/var/lib/jenkins') }
 
+  context 'with my plugin parent directory already defined' do
+    let(:pre_condition) do
+      [
+        "file { '/var/lib/jenkins' : ensure => directory, }",
+      ]
+    end
+
+    include_examples 'manages plugins dirs'
+  end
+
+
   describe 'without version' do
     it { should contain_exec('download-myplug').with(
       :command      => 'rm -rf myplug myplug.* && wget --no-check-certificate http://updates.jenkins-ci.org/latest/myplug.hpi',