commit https://github.com/vim/vim/commit/a260b87d9da17f605666630f18c1ed909c2b8bae Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jan 15 20:48:22 2016 +0100 patch 7.4.1096 Problem: Need several lines to verify a command produces an error. Solution: Add assert_fails(). (suggested by Nikolay Pavlov) Make the quickfix alloc test actually work.

Test A:
  - file name displayed: test://bar.txt
  - quickfix claims that the file name displayed is: test://bar.txt
Test B:
  - number of window open: 2
Test C:
  - 'buftype' of the location list window: quickfix
  - buffer displayed in the 2nd window: test://quux.txt