test_expect_equal "$output" "(D) add_files, pass 3: queuing leftover directory ${MAIL_DIR}/two for deletion from database
No new mail. Removed 3 messages."
+test_begin_subtest "One character directory at top level"
+test_subtest_known_broken
+
+generate_message [dir]=A
+generate_message [dir]=A/B
+generate_message [dir]=A/B/C
+
+output=$(NOTMUCH_NEW --debug)
+test_expect_equal "$output" "Added 3 new messages to the database."
+
+# clean up after the broken test to not mess up other tests
+rm -rf "${MAIL_DIR}"/A
+NOTMUCH_NEW 2>&1 > /dev/null
+
test_begin_subtest "Support single-message mbox"
cat > "${MAIL_DIR}"/mbox_file1 <<EOF
From test_suite@notmuchmail.org Fri Jan 5 15:43:57 2001