Fix specs

app/controllers/spree/admin/variants_controller.rb

@@ -72,8 +72,25 @@ module Spree
         render json: @variants, each_serializer: ::Api::Admin::VariantSerializer
       end
 
+      def destroy
+        @url_filters = ::ProductFilters.new.extract(request.query_parameters)
+
+        @variant = Spree::Variant.find(params[:id])
+        flash[:success] = delete_variant
+
+        redirect_to spree.admin_product_variants_url(params[:product_id], @url_filters)
+      end
+
       protected
 
+      def delete_variant
+        if VariantDeleter.new.delete(@variant)
+          Spree.t('notice_messages.variant_deleted')
+        else
+          Spree.t('notice_messages.variant_not_deleted')
+        end
+      end
+
       def create_before
         @object.save
       end