t6000: abstract away SHA-1-specific constants

Adjust the test so that it computes variables for object IDs instead of
using hard-coded hashes.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t6000-rev-list-misc.sh

@@ -104,13 +104,16 @@ test_expect_success 'rev-list can show index objects' '
 	#   - we do not show the root tree; since we updated the index, it
 	#     does not have a valid cache tree
 	#
-	cat >expect <<-\EOF &&
-	8e4020bb5a8d8c873b25de15933e75cc0fc275df one
-	d9d3a7417b9605cfd88ee6306b28dadc29e6ab08 only-in-index
-	9200b628cf9dc883a85a7abc8d6e6730baee589c two
-	EOF
 	echo only-in-index >only-in-index &&
 	test_when_finished "git reset --hard" &&
+	rev1=$(git rev-parse HEAD:one) &&
+	rev2=$(git rev-parse HEAD:two) &&
+	revi=$(git hash-object only-in-index) &&
+	cat >expect <<-EOF &&
+	$rev1 one
+	$revi only-in-index
+	$rev2 two
+	EOF
 	git add only-in-index &&
 	git rev-list --objects --indexed-objects >actual &&
 	test_cmp expect actual