test: add test for maintoggled standalone

refer: #2234

autoload/vimtex/test.vim

@@ -92,12 +92,17 @@ function! vimtex#test#keys(keys, context, expect) abort " {{{1
 endfunction
 
 " }}}1
-function! vimtex#test#main(file, expected) abort " {{{1
+function! vimtex#test#main(file, expected, ...) abort " {{{1
   execute 'silent edit' fnameescape(a:file)
 
+  " ToggleMain if extra arg supplied
+  if a:0 > 0
+    VimtexToggleMain
+  endif
+
   let l:expected = empty(a:expected) ? '' : fnamemodify(a:expected, ':p')
   call assert_true(exists('b:vimtex'))
-  call assert_equal(l:expected, b:vimtex.tex)
+  call assert_equal(fnamemodify(l:expected, ':.'), fnamemodify(b:vimtex.tex, ':.'))
 
   bwipeout!
 endfunction

test/test-get-main/test-standalone/a/a.tex

@@ -0,0 +1,6 @@
+\documentclass{standalone}
+\usepackage{standalone}
+\begin{document}
+A
+\input{a/b/b}
+\end{document}

test/test-get-main/test-standalone/a/b/b.tex

@@ -0,0 +1,4 @@
+\documentclass{standalone}
+\begin{document}
+B
+\end{document}

test/test-get-main/test-standalone/main.tex

@@ -0,0 +1,9 @@
+\documentclass{article}
+\usepackage[utf8]{inputenc}
+\usepackage{standalone}
+
+\begin{document}
+
+\input{a/a}
+
+\end{document}

test/test-get-main/test.vim

@@ -56,4 +56,8 @@ call vimtex#test#main('test-bib-alternate/references.bib', '')
 execute 'silent edit' fnameescape('test-bib-alternate/main.tex')
 call vimtex#test#main('test-bib-alternate/references.bib', 'test-bib-alternate/main.tex')
 
+" Test standalone
+call vimtex#test#main('test-standalone/a/a.tex', 'test-standalone/main.tex')
+call vimtex#test#main('test-standalone/a/a.tex', 'test-standalone/a/a.tex', 1)
+
 call vimtex#test#finished()