-output=$(notmuch insert $gen_msg_filename 2>&1)
-test_expect_equal "$output" "Error: tag '' in new.tags: empty tag forbidden"
+notmuch insert < $gen_msg_filename
+output=$(notmuch show --format=json id:$gen_msg_id)
+test_json_nodes <<<"$output" \
+ 'new_tags:[0][0][0]["tags"] = ["bar", "foo"]'