diff --git a/test/new b/test/new
index 587aa114..43d56e40 100755
--- a/test/new
+++ b/test/new
@@ -163,6 +163,19 @@ rm -rf "${MAIL_DIR}"/two
 output=$(NOTMUCH_NEW)
 test_expect_equal "$output" "No new mail. Removed 3 messages."
 
+test_begin_subtest "Support single-message mbox"
+cat > "${MAIL_DIR}"/mbox_file1 <<EOF
+From test_suite@notmuchmail.org Fri Jan  5 15:43:57 2001
+From: Notmuch Test Suite <test_suite@notmuchmail.org>
+To: Notmuch Test Suite <test_suite@notmuchmail.org>
+Subject: Test mbox message 1
+
+Body.
+EOF
+output=$(NOTMUCH_NEW 2>&1)
+test_expect_equal "$output" \
+"Added 1 new message to the database."
+
 # This test requires that notmuch new has been run at least once.
 test_begin_subtest "Skip and report non-mail files"
 generate_message