Fix weird test timeouts on Python 3.12

Any test involving snmpsim on Python 3.12 suddenly started becoming
flaky and time out, with no changes to the netsnmp-cffi codebase.
Increasing the SNMP timeouts for these tests seems to help.

Author: lunkwill42

tests/conftest.py

@@ -17,7 +17,7 @@ async def _verify_localhost_snmp_response(port: int):
     from netsnmpy import session
 
     try:
-        sess = session.SNMPSession(host="localhost", port=port, version=2)
+        sess = session.SNMPSession(host="localhost", port=port, version=2, timeout=5)
         sess.open()
         sysobjectid0 = OID(".1.3.6.1.2.1.1.2.0")
         return await sess.aget(sysobjectid0)
@@ -42,6 +42,7 @@ async def snmpsim(snmpsimd_path, snmp_fixture_directory, snmp_test_port):
     @retry(Exception, tries=3, delay=0.5, backoff=2)
     async def _wait_for_snmpsimd():
         if await _verify_localhost_snmp_response(snmp_test_port):
+            print("snmpsimd is responding to queries")
             return True
         else:
             raise TimeoutError("Still waiting for snmpsimd to listen for queries")

tests/test_session.py

@@ -102,7 +102,11 @@ def test_when_snmp_version_is_invalid_it_should_raise_valueerror():
 def simple_localhost_session(snmpsim, snmp_test_port):
     netsnmp.load_mibs()
     sess = session.SNMPSession(
-        host="localhost", port=snmp_test_port, version=2, community="public"
+        host="localhost",
+        port=snmp_test_port,
+        version=2,
+        community="public",
+        timeout=5,
     )
     sess.open()
     yield sess