test_expect_success 'checkout with grafts' '
test_when_finished rm .git/info/grafts &&
test_commit abc &&
- SHA1=`git rev-parse HEAD` &&
+ SHA1=$(git rev-parse HEAD) &&
test_commit def &&
test_commit xyz &&
- echo "`git rev-parse HEAD` $SHA1" >.git/info/grafts &&
+ echo "$(git rev-parse HEAD) $SHA1" >.git/info/grafts &&
cat >expected <<-\EOF &&
xyz
abc