2.5.x
Scala
According to:
http://stackoverflow.com/questions/19306787/writing-a-unit-test-for-play-websockets
http://stackoverflow.com/questions/43129203/how-to-test-a-scala-play-framework-websocket
Testing Web Socket is kind of popular, and documentation and samples will be useful.
It would be nice if the WebSocketClient.java mentioned above was embedded in the Play test framework in some form, rather than having to copy it from the samples.
There should also be documentation explaining it's usage.
Most helpful comment
This is in the websocket examples: