(with-current-buffer \"*Notmuch errors*\"
(test-output \"ERROR\")))"
test_expect_equal "$(cat OUTPUT ERROR)" "\
-Error invoking notmuch. $PWD/notmuch_fail show --format=json --exclude=false ' * ' exited with status 1.
+Error invoking notmuch. $PWD/notmuch_fail show --format=json --format-version=1 --exclude=false ' * ' exited with status 1.
Error:
This is an error
Output: