git diff-files -b -p --exit-code
'
+test_expect_success 'diff-files --diff-filter --quiet' '
+ git reset --hard &&
+ rm a/d &&
+ echo x >>b/e &&
+ test_must_fail git diff-files --diff-filter=M --quiet
+'
+
+test_expect_success 'diff-tree --diff-filter --quiet' '
+ git commit -a -m "worktree state" &&
+ test_must_fail git diff-tree --diff-filter=M --quiet HEAD^ HEAD
+'
+
test_done