diff --git a/message/tests/messagelib_test.php b/message/tests/messagelib_test.php
index 231149aec8c..e2c2dcdd2f1 100644
--- a/message/tests/messagelib_test.php
+++ b/message/tests/messagelib_test.php
@@ -270,6 +270,18 @@ class core_message_messagelib_testcase extends advanced_testcase {
         $this->assertEquals(0, message_count_unread_messages($userto, $userfrom1));
     }
 
+    /**
+     * Test message_count_unread_messages with sent messages.
+     */
+    public function test_message_count_unread_messages_with_sent_messages() {
+        $userfrom = $this->getDataGenerator()->create_user();
+        $userto = $this->getDataGenerator()->create_user();
+
+        $this->send_fake_message($userfrom, $userto);
+
+        $this->assertEquals(0, message_count_unread_messages($userfrom));
+    }
+
     /**
      * Test message_add_contact.
      */