Question: simulate delay of connected

[SephVelut]

I would like to test that my client will not send data to the server until it opens. Is there a way to sequence attemptConnection -> open -> send on the Server? Then I can I have my client attempt to send data in-between attemptConnection and open and see if it gracefully handles a pending connection. Or less ideally, slip a delay somewhere?

Note, the event connection is not what I'm looking for. I'm trying to test behavior before a connection is established, not after.