cp initial-config bad-config
printf '[query]\nq3=from:\xff\n' >>bad-config
test_expect_code 1 "notmuch --config=./bad-config config list"
cp initial-config bad-config
printf '[query]\nq3=from:\xff\n' >>bad-config
test_expect_code 1 "notmuch --config=./bad-config config list"