commit https://github.com/vim/vim/commit/43345546ae63710441f066648b8485fb545b3801 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Nov 29 17:35:35 2015 +0100 patch 7.4.944 Problem: Writing tests for Vim script is hard. Solution: Add assertEqual(), assertFalse() and assertTrue() functions. Add the v:errors variable. Add the runtest script. Add a first new style test script.

" Test that the methods used for testing work.

func Test_assertFalse()
  call assertFalse(0)
endfunc

func Test_assertTrue()
  call assertTrue(1)
  call assertTrue(123)
endfunc

func Test_assertEqual()
  let s = 'foo'
  call assertEqual('foo', s)
  let n = 4
  call assertEqual(4, n)
  let l = [1, 2, 3]
  call assertEqual([1, 2, 3], l)
endfunc