How to test margin api

From documentaion (https://binance-docs.github.io/apidocs/spot/en/#spot-testnet) I know that testnet.binance.vision can be used to test SPOT API only.
Developing application that uses MARGIN API. How to test MARGIN API?
Do you have test accounts on binance.com? If so, how can I use them?

Hello, unfortunately we don’t have test environment for margin (*/sapi/ endpoints) yet.

Please add “test sandbox” for Margin API

Hello! Does Binance have any plans to launch testnet for margin trading?