Added two test cases.

Development.md

@@ -3,6 +3,7 @@
 ## Change Poetry Venv Python Version
 
 ```bash
+pyenv local 3.12
 poetry env use 3.12
 poetry env info --path
 ```

tests/hlapi/asyncio/manager/cmdgen/test_usm_none_none.py

@@ -0,0 +1,22 @@
+import pytest
+from pysnmp.hlapi.asyncio import *
+
+@pytest.mark.asyncio
+async def test_usm_no_auth_no_priv():
+    snmpEngine = SnmpEngine()
+    authData = UsmUserData(
+        "usr-none-none"
+    )
+    errorIndication, errorStatus, errorIndex, varBinds = await getCmd(
+        snmpEngine,
+        authData,
+        UdpTransportTarget(("demo.pysnmp.com", 161)),
+        ContextData(),
+        ObjectType(ObjectIdentity("SNMPv2-MIB", "sysDescr", 0)),
+    )
+
+    assert errorIndication is None
+    assert errorStatus == 0
+    assert len(varBinds) == 1
+    assert varBinds[0][0].prettyPrint() == "SNMPv2-MIB::sysDescr.0"
+    isinstance(varBinds[0][1], OctetString)

tests/hlapi/asyncio/manager/cmdgen/test_usm_none_none_wrong_user.py

@@ -0,0 +1,20 @@
+import pytest
+from pysnmp.hlapi.asyncio import *
+from pysnmp.proto.errind import DecryptionError
+
+@pytest.mark.asyncio
+async def test_usm_no_auth_no_priv_wrong_user():
+    snmpEngine = SnmpEngine()
+    authData = UsmUserData(
+        "usr-none-none-not-exist"
+    )
+    errorIndication, errorStatus, errorIndex, varBinds = await getCmd(
+        snmpEngine,
+        authData,
+        UdpTransportTarget(("demo.pysnmp.com", 161), retries=0),
+        ContextData(),
+        ObjectType(ObjectIdentity("SNMPv2-MIB", "sysDescr", 0)),
+    )
+
+    assert isinstance(errorIndication, DecryptionError)
+    # assert str(errorIndication) == 'Ciphering services not available or ciphertext is broken'