diff --git a/frontend_tests/node_tests/unread.js b/frontend_tests/node_tests/unread.js
index 33ca974aee..6adb8f139c 100644
--- a/frontend_tests/node_tests/unread.js
+++ b/frontend_tests/node_tests/unread.js
@@ -510,31 +510,49 @@ test("mentions", () => {
         unread: true,
     };
 
+    const muted_direct_mention_message = {
+        id: 17,
+        type: "stream",
+        stream_id: muted_stream_id,
+        topic: "lunch",
+        mentioned: true,
+        mentioned_me_directly: true,
+        unread: true,
+    };
+
     unread.process_loaded_messages([
         already_read_message,
         mention_me_message,
         mention_all_message,
         muted_mention_all_message,
+        muted_direct_mention_message,
     ]);
 
     counts = unread.get_counts();
-    assert.equal(counts.mentioned_message_count, 2);
+    assert.equal(counts.mentioned_message_count, 3);
     assert.deepEqual(unread.get_msg_ids_for_mentions(), [
         mention_me_message.id,
         mention_all_message.id,
+        muted_direct_mention_message.id,
     ]);
     assert.deepEqual(unread.get_all_msg_ids(), [
         mention_me_message.id,
         mention_all_message.id,
         muted_mention_all_message.id,
     ]);
-    test_notifiable_count(counts.home_unread_messages, 2);
+    test_notifiable_count(counts.home_unread_messages, 3);
 
     unread.mark_as_read(mention_me_message.id);
     unread.mark_as_read(mention_all_message.id);
+    unread.mark_as_read(muted_direct_mention_message.id);
     counts = unread.get_counts();
     assert.equal(counts.mentioned_message_count, 0);
     test_notifiable_count(counts.home_unread_messages, 0);
+
+    // redundantly read a message to make sure nothing explodes
+    unread.mark_as_read(muted_direct_mention_message.id);
+    counts = unread.get_counts();
+    assert.equal(counts.mentioned_message_count, 0);
 });
 
 test("mention updates", () => {