improve backup

test/controllers/admin/backups_controller_test.rb

@@ -23,8 +23,13 @@ module Admin
       login("test@example.com", "password")
     end
 
-    test "should show admin_backup" do
-      get admin_backup_url(@admin_backup)
+    test "should create admin_backup xlsx" do
+      get admin_backup_url(@admin_backup, format: :xlsx)
+      assert_response :success
+    end
+
+    test "should create admin_backup zip" do
+      get admin_backup_url(@admin_backup, format: :zip)
       assert_response :success
     end
   end