How do you test NATS client interoperability?

Question

Java

Good afternoon everyone.
There is such a cool pub-sub server from Google NATS .
There are many client implementations for different languages, for Java there is jnats .
We write services that communicate with each other via NATS .
Someone uses NATS? How do you test NATS client communication?
Googling about this just says that there is embedded gnatsd for Go , but I didn’t find any tools for Java.