I broke up with neovim....vim is my best friend now

dot_vim/plugged/vimtex/test/test-state/test_builddir.vim

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+set nocompatible
+let &rtp = '../..,' . &rtp
+filetype plugin on
+
+nnoremap q :qall!<cr>
+
+call vimtex#log#set_silent()
+
+function! TestBuildDir(expected) abort
+  silent edit test.tex
+  let l:build_dir = vimtex#paths#shorten_relative(
+        \ fnamemodify(b:vimtex.get_aux_file('dummy', 1), ':h'))
+  call assert_equal(a:expected, l:build_dir)
+  bwipeout
+endfunction
+
+call TestBuildDir('')
+
+let g:vimtex_compiler_latexmk = {'build_dir': 'out'}
+call TestBuildDir('out')
+
+let $VIMTEX_OUTPUT_DIRECTORY = 'out'
+call TestBuildDir('out')
+call assert_true(empty(vimtex#log#get()))
+
+let $VIMTEX_OUTPUT_DIRECTORY = 'build'
+call TestBuildDir('build')
+let s:warning = get(map(vimtex#log#get(), {_, x -> x.msg[0]}), 0, 'NONE')
+call assert_equal(
+      \ 'Setting VIMTEX_OUTPUT_DIRECTORY overrides build_dir!',
+      \ s:warning)
+
+let $VIMTEX_OUTPUT_DIRECTORY = ''
+call TestBuildDir('out')
+
+call vimtex#test#finished()