Add mocking support.

lib/fog/hp/requests/compute/get_image_details.rb

@@ -22,6 +22,22 @@ module Fog
         end
 
       end
+
+      class Mock
+
+        def get_image_details(image_id)
+          response = Excon::Response.new
+          if image = list_images_detail.body['images'].detect {|_| _['id'] == image_id}
+            response.status = [200, 203][rand(1)]
+            response.body = { 'image' => image }
+            response
+          else
+            raise Fog::Compute::HP::NotFound
+          end
+        end
+
+      end
+
     end
   end
 end