Before: Save g:ale_tex_latexindent_executable Save g:ale_tex_latexindent_options " Use an invalid global executable, so we don't match it. let g:ale_tex_latexindent_executable = 'xxxinvalid' let g:ale_tex_latexindent_options = '' call ale#test#SetDirectory('/testplugin/test/fixers') After: Restore call ale#test#RestoreDirectory() Execute(The latexindent callback should return the correct default values): call ale#test#SetFilename('../test-files/tex/testfile.tex') AssertEqual \ { \ 'command': ale#Escape('xxxinvalid') \ . ' -l' \ }, \ ale#fixers#latexindent#Fix(bufnr('')) Execute(The latexindent callback should include custom gofmt options): let g:ale_tex_latexindent_options = "-l '~/.indentconfig.yaml'" call ale#test#SetFilename('../test-files/tex/testfile.tex') AssertEqual \ { \ 'command': ale#Escape('xxxinvalid') \ . ' -l' \ . ' ' . g:ale_tex_latexindent_options \ }, \ ale#fixers#latexindent#Fix(bufnr(''))