diff --git a/autoload/ale/test.vim b/autoload/ale/test.vim
index 346786c..5fe4bed 100644
--- a/autoload/ale/test.vim
+++ b/autoload/ale/test.vim
@@ -19,7 +19,7 @@ function! ale#test#SetDirectory(docker_path) abort
     " Try to switch directory, which will fail when running tests directly,
     " and not through the Docker image.
     silent! execute 'cd ' . fnameescape(a:docker_path)
-    let g:dir = getcwd()
+    let g:dir = getcwd() " no-custom-checks
 endfunction
 
 " When g:dir is defined, switch back to the directory we saved, and then
@@ -43,7 +43,7 @@ function! ale#test#SetFilename(path) abort
     let l:dir = get(g:, 'dir', '')
 
     if empty(l:dir)
-        let l:dir = getcwd()
+        let l:dir = getcwd() " no-custom-checks
     endif
 
     let l:full_path = ale#path#IsAbsolute(a:path)
diff --git a/test/script/custom-checks b/test/script/custom-checks
index 3624ffd..a1a734d 100755
--- a/test/script/custom-checks
+++ b/test/script/custom-checks
@@ -85,6 +85,7 @@ check_errors 'let g:ale_\w\+_\w\+_args =' 'Name your option g:ale_<filetype>_<li
 check_errors 'shellescape(' 'Use ale#Escape instead of shellescape'
 check_errors 'simplify(' 'Use ale#path#Simplify instead of simplify'
 check_errors "expand(['\"]%" "Use expand('#' . a:buffer . '...') instead. You might get a filename for the wrong buffer."
+check_errors 'getcwd()' "Do not use getcwd(), as it could run from the wrong buffer. Use expand('#' . a:buffer . ':p:h') instead."
 check_errors '==#' "Use 'is#' instead of '==#'. 0 ==# 'foobar' is true"
 check_errors '==?' "Use 'is?' instead of '==?'. 0 ==? 'foobar' is true"
 check_errors '!=#' "Use 'isnot#' instead of '!=#'. 0 !=# 'foobar' is false"