test_begin_subtest "error adding user header before initializing DB"
notmuch config set index.header.List List-Id 2>&1 | notmuch_dir_sanitize > OUTPUT
cat <<EOF > EXPECTED
-Error opening database at MAIL_DIR/.notmuch: No such file or directory
+Error: Cannot open database at MAIL_DIR/.notmuch: No such file or directory.
EOF
test_expect_equal_file EXPECTED OUTPUT