t7064: use update-ref -d to remove upstream branch

The previous code tested this by writing $ZERO_OID explicitly in the packed-refs
file. This is a type of corruption that doesn't reflect realistic use-cases. In
addition, even the ref-store test-tool refuses to write invalid OIDs.
(update-ref interprets $ZERO_OID is deleting the ref).

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t7064-wtstatus-pv2.sh b/t/t7064-wtstatus-pv2.sh
index 4613882caffc3f1fe91d65426fddee825fc09e46..eeb0534163db176442d38d19d0afb186cd985666 100755 (executable)
--- a/t/t7064-wtstatus-pv2.sh
+++ b/t/t7064-wtstatus-pv2.sh
@@ -373,10 +373,7 @@ test_expect_success 'verify upstream fields in branch header' '
 
                ## Test upstream-gone case. Fake this by pointing
                ## origin/initial-branch at a non-existing commit.
-               OLD=$(git rev-parse origin/initial-branch) &&
-               NEW=$ZERO_OID &&
-               mv .git/packed-refs .git/old-packed-refs &&
-               sed "s/$OLD/$NEW/g" <.git/old-packed-refs >.git/packed-refs &&
+               git update-ref -d refs/remotes/origin/initial-branch &&
 
                HUF=$(git rev-parse HEAD) &&