Add unittest

tests/test_rfc2737.py

@@ -0,0 +1,26 @@
+import os
+import sys
+from unittest import TestCase
+from sonic_ax_impl.mibs.ietf.rfc2737 import PhysicalTableMIBUpdater
+
+
+if sys.version_info.major == 3:
+    from unittest import mock
+else:
+    import mock
+
+modules_path = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+sys.path.insert(0, os.path.join(modules_path, 'src'))
+
+
+class TestPhysicalSensorTableMIBUpdater(TestCase):
+
+    @mock.patch('sonic_ax_impl.mibs.ietf.rfc2737.PsuCacheUpdater.reinit_data', side_effect=Exception('mocked error'))
+    def test_PhysicalSensorTableMIBUpdater_transceiver_info_key_missing(self):
+        updater = PhysicalTableMIBUpdater()
+
+        with mock.patch('sonic_ax_impl.mibs.ietf.rfc2737.ThermalCacheUpdater.reinit_data') as mocked_reinit_data:
+            updater.reinit_data()
+
+            # check warning
+            mocked_reinit_data.assert_called()