This test performs a clone from outside any repository. Consequently,
the hash algorithm used defaults to SHA-1. When the test is running with
SHA-256, this results in an object ID that is not usable by the rest of
the test. In order to ensure that we provide a usable value, switch into
the source repository before hashing.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>