add acceptance test to verify default values

spec/acceptance/init_spec.rb

@@ -0,0 +1,32 @@
+require 'spec_helper_acceptance'
+
+describe 'zabbix::server class' do
+  context 'default parameters' do
+    # Using puppet_apply as a helper
+    it 'works idempotently with no errors' do
+      pp = <<-EOS
+        include nginx
+      EOS
+
+      # Run it twice and test for idempotency
+      apply_manifest(pp, catch_failures: true)
+      apply_manifest(pp, catch_changes: true)
+    end
+
+    # do some basic checks
+    case fact('os.family')
+    when 'Archlinux'
+      pkg = 'nginx-mainline'
+    else
+      pkg = 'nginx'
+    end
+    describe package(pkg) do
+      it { is_expected.to be_installed }
+    end
+
+    describe service('nginx') do
+      it { is_expected.to be_running }
+      it { is_expected.to be_enabled }
+    end
+  end
+end