+test_expect_success 'patch-id supports git-format-patch output' '
+ get_patch_id master &&
+ git checkout same &&
+ git format-patch -1 --stdout | calc_patch_id same &&
+ test_cmp patch-id_master patch-id_same &&
+ set `git format-patch -1 --stdout | git patch-id` &&
+ test "$2" = `git rev-parse HEAD`
+'
+
+test_expect_success 'whitespace is irrelevant in footer' '
+ get_patch_id master &&
+ git checkout same &&
+ git format-patch -1 --stdout | sed "s/ \$//" | calc_patch_id same &&
+ test_cmp patch-id_master patch-id_same
+'
+
+test_expect_success 'patch-id supports git-format-patch MIME output' '
+ get_patch_id master &&
+ git checkout same &&
+ git format-patch -1 --attach --stdout | calc_patch_id same &&
+ test_cmp patch-id_master patch-id_same
+'
+