tests: use 'test_must_be_empty' instead of 'test ! -s'

diff --git a/t/t9820-git-p4-editor-handling.sh b/t/t9820-git-p4-editor-handling.sh
index 6dc6df032ec0c15b39dccd24ade52580fc115add..3c22f74bd436b7c6d94d5c29d5b2e3e3510d58e6 100755 (executable)
--- a/t/t9820-git-p4-editor-handling.sh
+++ b/t/t9820-git-p4-editor-handling.sh
@@ -26,7 +26,7 @@ test_expect_success 'EDITOR with options' '
                cd "$git" &&
                echo change >file1 &&
                git commit -m "change" file1 &&
-               P4EDITOR=": >\"$git/touched\" && test-chmtime +5" git p4 submit &&
+               P4EDITOR=": >\"$git/touched\" && test-tool chmtime +5" git p4 submit &&
                test_path_is_file "$git/touched"
        )
 '