commit https://github.com/vim/vim/commit/e74e8e7d758e9312165a931f176185f07a64231a Author: Bram Moolenaar <Bram@vim.org> Date: Tue Feb 16 22:01:30 2016 +0100 patch 7.4.1342 Problem: On Mac OS/X the waittime must be > 0 for connect to work. Solution: Use select() in a different way. (partly by Kazunobu Kuriyama) Always use a waittime of 1 or more.

--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -28,7 +28,7 @@ else
   finish
 endif
 
-let s:chopt = has('osx') ? {'waittime' : 1} : {}
+let s:chopt = {}
 
 " Run "testfunc" after sarting the server and stop the server afterwards.
 func s:run_server(testfunc)