test_begin_subtest "Show message: sexp, inline attachment filename"
subject='sexp-show-inline-attachment-filename'
id="sexp-show-inline-attachment-filename@notmuchmail.org"
-emacs_deliver_message \
+emacs_fcc_message \
"$subject" \
'This is a test message with inline attachment with a filename' \
"(mml-attach-file \"$TEST_DIRECTORY/README\" nil nil \"inline\")