test: add tests for compiler.get_file

test/test-getfile/Makefile

@@ -0,0 +1,14 @@
+MYVIM ?= nvim --clean --headless
+
+INMAKE := 1
+export INMAKE
+
+TESTS := $(wildcard test*.vim)
+TESTS := $(TESTS:.vim=)
+
+.PHONY: default $(TESTS)
+
+default: $(TESTS)
+
+$(TESTS):
+	@$(MYVIM) -u $@.vim

test/test-getfile/test_auxdir.vim

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+set nocompatible
+let &rtp = '../..,' . &rtp
+filetype plugin on
+
+nnoremap q :qall!<cr>
+
+function! Test(file, expected) abort
+  silent edit test_auxdir/test.tex
+  let l:file = vimtex#paths#shorten_relative(
+        \ b:vimtex.compiler.get_file(a:file))
+  call assert_equal(a:expected, l:file)
+  bwipeout
+endfunction
+
+call Test('pdf', 'test.pdf')
+
+let g:vimtex_compiler_latexmk = {'out_dir': 'out'}
+call Test('pdf', 'out/test.pdf')
+call Test('aux', 'out/test.aux')
+call Test('fls', 'out/test.fls')
+call Test('log', 'out/test.log')
+call Test('blg', 'out/test.blg')
+
+let g:vimtex_compiler_latexmk = {'aux_dir': 'aux'}
+call Test('pdf', 'test.pdf')
+call Test('fls', 'test.fls')
+call Test('aux', 'aux/test.aux')
+call Test('log', 'aux/test.log')
+call Test('blg', 'aux/test.blg')
+
+let g:vimtex_compiler_latexmk = {
+      \ 'out_dir': 'out',
+      \ 'aux_dir': 'aux'
+      \}
+call Test('pdf', 'out/test.pdf')
+call Test('fls', 'out/test.fls')
+call Test('aux', 'aux/test.aux')
+call Test('log', 'aux/test.log')
+call Test('blg', 'aux/test.blg')
+
+call vimtex#log#set_silent()
+let $VIMTEX_OUTPUT_DIRECTORY = 'out'
+call Test('aux', 'out/test.aux')
+call Test('log', 'out/test.log')
+
+call vimtex#test#finished()

test/test-getfile/test_auxdir/test.tex

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+\documentclass{minimal}
+\begin{document}
+
+Dummy file
+
+\end{document}