patch 8.0.0237: when 'wildoptions' is "tagfile" completion may not work commit https://github.com/vim/vim/commit/ba47b51ff88d91c9bb5aa522183e23a656865697 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jan 24 21:18:19 2017 +0100 patch 8.0.0237: when 'wildoptions' is "tagfile" completion may not work Problem: When setting wildoptions=tagfile the completion context is not set correctly. (desjardins) Solution: Check for EXPAND_TAGS_LISTFILES. (Christian Brabandt, closes #1399)

function! Test_WriteFile()
  let f = tempname()
  call writefile(["over","written"], f, "b")
  call writefile(["hello","world"], f, "b")
  call writefile(["!", "good"], f, "a")
  call writefile(["morning"], f, "ab")
  call writefile(["", "vimmers"], f, "ab")
  let l = readfile(f)
  call assert_equal("hello", l[0])
  call assert_equal("world!", l[1])
  call assert_equal("good", l[2])
  call assert_equal("morning", l[3])
  call assert_equal("vimmers", l[4])
  call delete(f)
endfunction