add_message [subject]='"Non-maildir message"' [dir]=notmaildir [filename]='non-maildir-message'
expected=$(notmuch search --output=files subject:"Non-maildir message")
add_message [subject]='"Non-maildir message"' [dir]=notmaildir [filename]='non-maildir-message'
expected=$(notmuch search --output=files subject:"Non-maildir message")