[voxel|compute] minor fixes for voxel tests

tests/compute/requests/voxel/image_tests.rb

@@ -1,45 +1,51 @@
 Shindo.tests('Voxel::Compute | image requests', ['voxel']) do
 
-  @images_format = [{
-    'id'    => Integer,
-    'summary'  => String
-  }]
+  @images_format = {
+    'images' => [{
+      'id'      => Integer,
+      'summary' => String
+    }],
+    'stat' => String
+  }
 
   @image_format = {
-    'description'       => String,
-    'id'                => Integer,
-    'filesystem'        => {
-      'size'  => Integer,
-      'type'  => String,
-      'units' => String,
-    },
-    'operating_system'  => {
-      'admin_username'  => String,
-      'architecture'    => Integer,
-      'family'          => String,
-      'product_family'  => String,
-      'product_version' => String,
-      'version'         => String
-    },
-    'summary'           => String
+    'images' => [{
+      'description'       => String,
+      'id'                => Integer,
+      'filesystem'        => {
+        'size'  => Integer,
+        'type'  => String,
+        'units' => String,
+      },
+      'operating_system'  => {
+        'admin_username'  => String,
+        'architecture'    => Integer,
+        'family'          => String,
+        'product_family'  => String,
+        'product_version' => String,
+        'version'         => String
+      },
+      'summary'           => String
+    }],
+    'stat' => String
   }
 
   tests('success') do
     tests('#images_list').formats(@images_format) do
       pending if Fog.mocking?
-      Voxel[:compute].images_list
+      Voxel[:compute].images_list.body
     end
 
-    tests('#images_list(1)').formats([@image_format]) do
+    tests('#images_list(1)').formats(@image_format) do
       pending if Fog.mocking?
-      Voxel[:compute].images_list(1)
+      Voxel[:compute].images_list(1).body
     end
   end
 
   tests('failure') do
     tests('#images_list(0)').raises(Fog::Voxel::Compute::Error) do
       pending if Fog.mocking?
-      Voxel[:compute].images_list(0)
+      Voxel[:compute].images_list(0).body
     end
   end
 

tests/compute/requests/voxel/server_tests.rb

@@ -13,7 +13,7 @@ Shindo.tests('Voxel::Compute | server requests', ['voxel']) do
       'access_methods'    => [],
       'description'       => String,
       'drives'            => {
-        'position'  => Integer,
+        'position'  => Fog::Nullable::Integer,
         'size'      => Integer
       },
       'id'                => String,