diff --git a/manifests/backend/nfs.pp b/manifests/backend/nfs.pp
index 6716a4c8..32808e97 100644
--- a/manifests/backend/nfs.pp
+++ b/manifests/backend/nfs.pp
@@ -2,6 +2,9 @@
 #
 # === Parameters
 #
+# [*nfs_servers*]
+#   (Required) List of available NFS shares.
+#
 # [*volume_backend_name*]
 #   (optional) Allows for the volume_backend_name to be separate of $name.
 #   Defaults to: $name
@@ -12,10 +15,6 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
-# [*nfs_servers*]
-#   (Required) Description
-#   Defaults to '[]'
-#
 # [*nfs_mount_attempts*]
 #   (optional) The number of attempts to mount nfs shares before raising an
 #   error. At least one attempt will be made to mount an nfs share, regardless
@@ -90,9 +89,9 @@
 #     { 'nfs_backend/param1' => { 'value' => value1 } }
 #
 define cinder::backend::nfs (
+  Array[String[1], 1] $nfs_servers,
   $volume_backend_name                    = $name,
   $backend_availability_zone              = $facts['os_service_default'],
-  Array[String] $nfs_servers              = [],
   $nfs_mount_attempts                     = $facts['os_service_default'],
   $nfs_mount_options                      = $facts['os_service_default'],
   $nfs_sparsed_volumes                    = $facts['os_service_default'],
diff --git a/spec/defines/cinder_backend_nfs_spec.rb b/spec/defines/cinder_backend_nfs_spec.rb
index 14cf6bd8..84446c67 100644
--- a/spec/defines/cinder_backend_nfs_spec.rb
+++ b/spec/defines/cinder_backend_nfs_spec.rb
@@ -5,24 +5,54 @@ describe 'cinder::backend::nfs' do
 
   let :params do
     {
-      :backend_availability_zone   => 'my_zone',
-      :nfs_servers                 => ['10.10.10.10:/shares', '10.10.10.10:/shares2'],
-      :nfs_mount_attempts          => '4',
-      :nfs_mount_options           => 'vers=3',
-      :nfs_shares_config           => '/etc/cinder/other_shares.conf',
-      :nfs_sparsed_volumes         => true,
-      :nfs_mount_point_base        => '/cinder_mount_point',
-      :nfs_used_ratio              => '0.7',
-      :nfs_oversub_ratio           => '0.9',
-      :nas_secure_file_operations  => 'auto',
-      :nas_secure_file_permissions => 'false',
-      :nfs_snapshot_support        => 'true',
-      :nfs_qcow2_volumes           => 'true',
+      :nfs_servers => ['10.10.10.10:/shares', '10.10.10.10:/shares2'],
     }
   end
 
   shared_examples 'cinder::backend::nfs' do
-    context 'nfs volume driver' do
+    context 'with defaults' do
+      it {
+        is_expected.to contain_cinder_config('hippo/volume_backend_name').with_value('hippo')
+        is_expected.to contain_cinder_config('hippo/backend_availability_zone').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/volume_driver').with_value('cinder.volume.drivers.nfs.NfsDriver')
+        is_expected.to contain_cinder_config('hippo/nfs_shares_config').with_value('/etc/cinder/shares.conf')
+        is_expected.to contain_cinder_config('hippo/nfs_mount_attempts').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/nfs_mount_options').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/nfs_sparsed_volumes').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/nfs_mount_point_base').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/nfs_used_ratio').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/nfs_oversub_ratio').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/nas_secure_file_operations').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/nas_secure_file_permissions').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/nfs_snapshot_support').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/nfs_qcow2_volumes').with_value('<SERVICE DEFAULT>')
+      }
+
+      it { is_expected.to contain_file('/etc/cinder/shares.conf').with(
+        :content => "10.10.10.10:/shares\n10.10.10.10:/shares2",
+        :require => 'Anchor[cinder::install::end]',
+        :notify  => 'Anchor[cinder::service::begin]'
+      )}
+    end
+
+    context 'with parameters' do
+      before :each do
+        params.merge!({
+          :backend_availability_zone   => 'my_zone',
+          :nfs_mount_attempts          => '4',
+          :nfs_mount_options           => 'vers=3',
+          :nfs_shares_config           => '/etc/cinder/other_shares.conf',
+          :nfs_sparsed_volumes         => true,
+          :nfs_mount_point_base        => '/cinder_mount_point',
+          :nfs_used_ratio              => '0.7',
+          :nfs_oversub_ratio           => '0.9',
+          :nas_secure_file_operations  => 'auto',
+          :nas_secure_file_permissions => 'false',
+          :nfs_snapshot_support        => 'true',
+          :nfs_qcow2_volumes           => 'true',
+        })
+      end
+
       it {
         is_expected.to contain_cinder_config('hippo/volume_backend_name').with_value('hippo')
         is_expected.to contain_cinder_config('hippo/backend_availability_zone').with_value('my_zone')