docs: add comments

kenjis · kenjis · commit 1be868653559 · 2023-10-27T06:13:40.000+09:00
diff --git a/app/Config/Boot/testing.php b/app/Config/Boot/testing.php
@@ -1,5 +1,11 @@
 <?php
 
+/*
+ * The environment testing is reserved for PHPUnit testing. It has special
+ * conditions built into the framework at various places to assist with that.
+ * You can’t use it for your development.
+ */
+
 /*
  |--------------------------------------------------------------------------
  | ERROR DISPLAY
