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')
  call system('touch fig_a.png')
  call system('touch fig_b.png')
  call system('touch fig_c.png')
  call system('touch preamble.tex')
  call system('touch chapter.tex')
  call system('touch section.tex')

Given tex (Completion: \includegraphics):
=================================================================================
  \includegraphics{
  \includegraphics[scale=0.5]{
  \includegraphics[100,100][300,300]{

Execute (Debug):
  Log system('ls')
  Log b:vimtex
  Log &omnifunc

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

Expect tex (Verify):
  \includegraphics{fig_b.png}
  \includegraphics[scale=0.5]{fig_c.png}
  \includegraphics[100,100][300,300]{fig_1.pdf}

Given tex (Completion: \include and \input):
=================================================================================
  \input {
  \includeonly{
  \include{

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

Expect tex (Verify):
  \input {preamble.tex}
  \includeonly{chapter.tex,section.tex}
  \include{section.tex}

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

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

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

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

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

Expect tex (Verify):
  \includestandalone{fig_1}

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