fix tests

spec/models/ability_spec.rb

@@ -21,7 +21,7 @@ describe User do
       it{ should_not be_able_to(:manage, Product.new) }
 
       it{ should be_able_to(:create, Order.new(user: user)) }
-      it{ should be_able_to(:delete, Order.new(user: user, created_at: Rails.application.config.call_api_after.minutes.ago)) }
+      it{ should be_able_to(:delete, Order.new(user: user, created_at: (Rails.application.config.call_api_after - 1.minutes).ago)) }
       it{ should_not be_able_to(:delete, Order.new(user: user, created_at: 10.minutes.ago)) }
       it{ should_not be_able_to(:manage, Order.new) }