[PATCH 050/144] t4204-patch-id.sh: use the $( ... ) construct for command substitution

The Git CodingGuidelines prefer the $( ... ) construct for command
substitution instead of using the back-quotes, or grave accents (`..`).

The backquoted form is the historical method for command substitution,
and is supported by POSIX. However,all but the simplest uses become
complicated quickly. In particular,embedded command substitutions
and/or the use of double quotes require careful escaping with the backslash
character. Because of this the POSIX shell adopted the $(…) feature from
the Korn shell.

Signed-off-by: Elia Pinto <redacted>
---
 t/t4204-patch-id.sh |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/t/t4204-patch-id.sh b/t/t4204-patch-id.sh
index d2c930d..7940f6f 100755
--- 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' '

-- 
1.7.10.4