Execute (Prepare completion tests):
  call mkdir('testdir')
  call system('touch testdir/fig_1.tex')
  call system('touch testdir/fig_2.tex')
  call system('touch testdir/fig_1.pdf')
  call system('touch testdir/fig_2.pdf')
  call system('touch testdir/fig_3.pdf')

Before:
  w! testdir/test.tex
  silent e! testdir/test.tex
  setf tex

After:
  w!
  bd! testdir/test.tex

Do (Completion: \includestandalone):
  i\includestandalone{\<c-x>\<c-o>\<c-n>}

Then (Assert):
  AssertEqual
    \ '\includestandalone{fig_2}',
    \ readfile('testdir/test.tex')[-1]

Do (Completion: \includepdf):
  i\includepdf{\<c-x>\<c-o>\<c-p>\<c-p>}

Then (Assert):
  AssertEqual
    \ '\includepdf{fig_3.pdf}',
    \ readfile('testdir/test.tex')[-1]

Before:
After:
Execute (Cleanup):
  call system('rm -rf testdir')