Execute (Setup):
  call system('touch fig_1.tex')
  call system('touch fig_2.tex')
  call system('touch fig_1.pdf')
  call system('touch fig_2.pdf')
  call system('touch fig_3.pdf')

Given tex (Completion: \includestandalone):
  \includestandalone{

Do (Complete):
  A\<c-x>\<c-o>\<c-n>}

Expect tex (Verify):
  \includestandalone{fig_2}

Given tex (Completion: \includepdf):
  \includepdf{

Do (Complete):
  A\<c-x>\<c-o>\<c-p>\<c-p>}

Expect tex (Verify):
  \includepdf{fig_3.pdf}

Given:
Execute (Cleanup):
  call system('rm -f fig*tex')
  call system('rm -f fig*pdf')