added missing test for the provider

spec/acceptance/key_value.rb

@@ -1,3 +1,46 @@
 # frozen_string_literal: true
 
 require 'spec_helper_acceptance'
+
+describe 'nomad class' do
+  context 'server with nomad_key_value declarations' do
+    # failing on purpose on missing directories
+    pp = <<-MANIFEST
+      class { 'nomad':
+        config_hash => {
+        datacenter => 'ptk',
+        data_dir   => "/var/lib/nomad",
+        extra_options => '-dev',
+        server     => {
+            enabled          => false,
+            bootstrap_expect => 1,
+          }
+        },
+        'acl' => {
+          'enabled' => false
+        },
+        'client' => {
+          'enabled' => false,
+        }
+      }
+      nomad_key_value { 'test/foo':
+        require => Class['nomad'],
+        value   => {
+          'key1' => 'value1',
+          'key2' => 'value2',
+        },
+      }
+      nomad_key_value { 'test/bar':
+        ensure  => absent;
+        require => Class['nomad'],
+        value   => {
+          'key1' => 'value10',
+        },
+      }
+    MANIFEST
+
+    # Run it twice and test for idempotency
+    apply_manifest(pp, expect_failures: true)
+    apply_manifest(pp, catch_changes: true)
+  end
+end