Receive error 404 when call testnet api

I do exactly the same steps in this tutorial to use testnet api with postman

I filled api key and secret key from generated keys in testnet
But when i call api in Wallet such as
sapi/v1/capital/config/getall
wapi/v3/systemStatus.html

I receive error 404 not found.

I don’t know what i missing when execute these requests with postman, please help me. Thank you a lot.

No sapi/wapi in testnet; only api endpoints available

Thank for your reply, i thought binance will give a balance in many different assets for trading in testnet, right? if yes, how can i know balance and what assets in my demo account, any api to query account?

api/v3/account