Tim Condon

@Lukasa cool, last thing I'll do is duplicate the tests and use the async upgrader then we should be good to go

@Lukasa I'm struggling to get the tests to pass. Even a simple `testRequiresVersion13` is triggering an error on server shutdown instead of when writing the buffer to the server. I'm...

@Lukasa any idea what's causing the run loop to not fire?

@Lukasa is this something you're planning on adding?

@Lukasa is the `NIOAsyncTestingChannel` supposed to be a drop-in replacement for `EmbeddedChannel`? In the new tests I'm running ```swift try client.writeString(upgradeRequest).wait() ``` and it's never returning

@Lukasa nothing to see here - that pointed me in the right direction!

Ooh it could well do

@FredericJacobs sure, give me a few days to see if it offers everything we need for JWTKit

Further discussions here https://forums.swift.org/t/native-implementations-and-boringssl-backed-apple-platform-deployments/33404/8?u=0xtim

Even though the exit code is different, this is probably related to [SR-12424](https://bugs.swift.org/browse/SR-12424). Can confirm the tests work fine from the command line in 5.3.