add tests for grafana:plugin

spec/defines/plugin_spec.rb

@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+describe 'grafana::plugin', type: :define do
+  on_supported_os.each do |os, facts|
+    context "on #{os} " do
+
+      let :facts do
+        facts
+      end
+
+      let :title do
+        'grafana-simple-json-datasource'
+      end
+
+      context 'with all defaults' do
+        it { is_expected.to compile.with_all_deps }
+        it { is_expected.to contain_exec("install #{title}") }
+      end
+    end
+  end
+end