t6034: use modern test_* helpers
t6034: use modern test_* helpers

These say roughly the same thing as the hand-rolled
messages. We do lose the "merge did not complete" debug
message, but merge and write-tree are prefectly capable of
writing useful error messages when they fail.

Signed-off-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git