reopen_tempfile(): truncate opened file

diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index 295d1475bde0151df65e0098e6e4a169193906ed..48379aa0ee874b0250e2348d47eded09713a0a79 100755 (executable)
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -310,7 +310,7 @@ test_expect_success 'exercise strftime with odd fields' '
        echo >expected &&
        git for-each-ref --format="%(authordate:format:)" refs/heads >actual &&
        test_cmp expected actual &&
-       long="long format -- $_z40$_z40$_z40$_z40$_z40$_z40$_z40" &&
+       long="long format -- $ZERO_OID$ZERO_OID$ZERO_OID$ZERO_OID$ZERO_OID$ZERO_OID$ZERO_OID" &&
        echo $long >expected &&
        git for-each-ref --format="%(authordate:format:$long)" refs/heads >actual &&
        test_cmp expected actual