commit https://github.com/vim/vim/commit/8b877ac38e96424a08a8b8eb713ef4b3cf0064be Author: Bram Moolenaar <Bram@vim.org> Date: Mon Mar 28 19:16:20 2016 +0200 patch 7.4.1669 Problem: When writing buffer lines to a pipe Vim may block. Solution: Avoid blocking, write more lines later.

" Tests for autocommands

func Test_vim_did_enter()
  call assert_false(v:vim_did_enter)

  " This script will never reach the main loop, can't check if v:vim_did_enter
  " becomes one.
endfunc