commit https://github.com/vim/vim/commit/c4dcd60c76666bf113719f929709ad6120eb6528 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 26 22:56:46 2016 +0100 patch 7.4.1662 Problem: No test for an invalid Ex command on a channel. Solution: Test handling an invalid command gracefully. Avoid getting an error message, do write it to the channel log.

Test for ":options".

STARTTEST
:so small.vim
:let caught = 'ok'
:try
  :options
:catch 
  :let caught = v:throwpoint . "\n" . v:exception
:endtry
:buf 1
:$put =caught
:"
:" Test that changing 'path' keeps two commas.
:set path=foo,,bar
:set path-=bar
:set path+=bar
:$put =&path
:/^result/,$w! test.out
:qa!
ENDTEST

result