testnet : how to simulate several order fills for a limit order ?

We’re making automated test for our trading algorithm. We want to ensure the bridge we’re making to the HTTP/WS api works. For this, we want to simulate placing a limit order, then being filled partially 3 times until the order is fully filled to see how our implementation behaves. Is there any way to tell to testnet to simulate several fills ? If not, our test would have hazardous results (depending on market) that we don’t want…
Thank you

You could try placing a big order and then place opposite orders for self trading and then see the several filling behaviour.