patch 8.0.0120
Problem: Channel test is still flaky on OS X.
Solution: Set the drop argument to "never".
diff --git a/src/testdir/test_channel.vim b/src/testdir/test_channel.vim
index 31c2e50..7baac1d 100644
--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -26,7 +26,10 @@
endfunc
func Ch_communicate(port)
+ " Avoid dropping messages, since we don't use a callback here.
+ let s:chopt.drop = 'never'
let handle = ch_open('localhost:' . a:port, s:chopt)
+ unlet s:chopt.drop
if ch_status(handle) == "fail"
call assert_false(1, "Can't open channel")
return