Added a new test case.

tests/hlapi/v3arch/asyncio/agent/ntforg/test_v3-trap.py

@@ -25,6 +25,25 @@ async def test_send_v3_trap_notification():
         assert message_count == [1]
 
 
+@pytest.mark.asyncio
+async def test_send_v3_trap_notification_none():
+    async with ManagerContextManager() as (_, message_count):
+        # snmptrap -v3 -l noAuthNoPriv -u usr-none-none -e 8000000001020305 localhost:MANAGER_PORT 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s "my system"
+        snmpEngine = SnmpEngine(OctetString(hexValue="8000000001020305"))
+        errorIndication, errorStatus, errorIndex, varBinds = await sendNotification(
+            snmpEngine,
+            UsmUserData("usr-none-none", None, None),
+            await UdpTransportTarget.create(("localhost", MANAGER_PORT)),
+            ContextData(),
+            "trap",
+            NotificationType(ObjectIdentity("IF-MIB", "linkDown")),
+        )
+
+        snmpEngine.closeDispatcher()
+        await asyncio.sleep(1)
+        assert message_count == [1]
+
+
 @pytest.mark.asyncio
 async def test_send_v3_trap_notification_invalid_user():
     async with ManagerContextManager() as (_, message_count):

tests/manager_context.py

@@ -58,6 +58,16 @@ async def start_manager(
         securityEngineId=v2c.OctetString(hexValue="8000000001020304"),
     )
 
+    # user: usr-none-none, auth: NONE, priv: NONE
+    # this USM entry is used for TRAP receiving purposes
+    config.addV3User(
+        snmpEngine,
+        "usr-none-none",
+        config.USM_AUTH_NONE,
+        config.USM_PRIV_NONE,
+        securityEngineId=v2c.OctetString(hexValue="8000000001020305"),
+    )
+
     # Callback function for receiving notifications
     # noinspection PyUnusedLocal,PyUnusedLocal,PyUnusedLocal
     def cbFun(