_x05='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
_x40="$_x05$_x05$_x05$_x05$_x05$_x05$_x05$_x05"
+# Zero SHA-1
+_z40=0000000000000000000000000000000000000000
+
# Each test should start with something like this, after copyright notices:
#
# test_description='Description of this test...