It's one of the flaky tests that we have had for a very long time.
There's work in progress fixing it as part of
https://github.com/mono/mono/pull/5345 and https://bugzilla.xamarin.com/show_bug.cgi?id=43172
but I think we should disable it in the meantime for clean CI.
#if FEATURE_NO_BSD_SOCKETS
[ExpectedException (typeof (PlatformNotSupportedException))]
#endif
+ [Ignore ("https://bugzilla.xamarin.com/show_bug.cgi?id=43172")]
public void SendAsyncFile ()
{
Socket serverSocket = new Socket (AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);