+test_begin_subtest "Ensure that emacs doesn't drop error messages"
+output=$(test_emacs '(notmuch-search "--this-option-does-not-exist") (notmuch-test-wait) (message (buffer-string))' 2>&1)
+test_expect_equal "$output" "Error: Unexpected output from notmuch search:
+Unrecognized option: --this-option-does-not-exist
+End of search results. (process returned 1)"
+