t7510: invoke git as part of &&-chain

diff --git a/t/t7510-signed-commit.sh b/t/t7510-signed-commit.sh
index 86d3f93fa22e45ba9dda24c49ec02df14e22ebc3..58f528b98faef1e1823d9ba423ff309c572b8f91 100755 (executable)
--- a/t/t7510-signed-commit.sh
+++ b/t/t7510-signed-commit.sh
@@ -49,9 +49,13 @@ test_expect_success GPG 'create signed commits' '
        git tag eighth-signed-alt &&
 
        # commit.gpgsign is still on but this must not be signed
-       git tag ninth-unsigned $(echo 9 | git commit-tree HEAD^{tree}) &&
+       echo 9 | git commit-tree HEAD^{tree} >oid &&
+       test_line_count = 1 oid &&
+       git tag ninth-unsigned $(cat oid) &&
        # explicit -S of course must sign.
-       git tag tenth-signed $(echo 9 | git commit-tree -S HEAD^{tree})
+       echo 10 | git commit-tree -S HEAD^{tree} >oid &&
+       test_line_count = 1 oid &&
+       git tag tenth-signed $(cat oid)
 '
 
 test_expect_success GPG 'verify and show signatures' '