t4204-patch-id.sh: use the $( ... ) construct for command substitution

diff --git a/t/t4204-patch-id.sh b/t/t4204-patch-id.sh
index d2c930de87f721a0e876351e511295ae0b094108..7940f6f0b952b5accd3f1263f08e131a018de140 100755 (executable)
--- a/t/t4204-patch-id.sh
+++ b/t/t4204-patch-id.sh
@@ -45,8 +45,8 @@ test_expect_success 'patch-id supports git-format-patch output' '
        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`
+       set $(git format-patch -1 --stdout | git patch-id) &&
+       test "$2" = $(git rev-parse HEAD)
 '
 
 test_expect_success 'whitespace is irrelevant in footer' '