commit https://github.com/vim/vim/commit/a803c7f94070f94b831fdfd1984f288c8b825b5d Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jan 15 15:31:39 2016 +0100 patch 7.4.1092 Problem: It is not simple to test for an exception and give a proper error message. Solution: Add assert_exception().

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