add test env and alert()

main.py

@@ -101,6 +101,9 @@ async def root():
 @app.get("/index2")
 async def index2():
     return FileResponse('index2.html')
+@app.get("/index3")
+async def index2():
+    return FileResponse('index3.html')
 @app.get("/script_msg.js")
 async def index2():
     return FileResponse('script_msg.js')