[tests] Mock get_switch_attribute() SAI API

During its initialization, PortsOrch queries switch capabilities to verify
if Path Tracing is supported or not.

Currently, PortsOrch UTs fail because the TAM object type required by Path Tracing
tests is not in the list of object types supported by the switch.

This commit mocks get_switch_attribute() SAI API in PortsOrch UT to return TAM object type
as part of the object types supported by the switch.

Signed-off-by: Carmine Scarpitta <cscarpit@cisco.com>

tests/mock_tests/portsorch_ut.cpp

@@ -107,6 +107,41 @@ namespace portsorch_test
         return pold_sai_port_api->set_port_attribute(port_id, attr);
     }
 
+    vector<sai_object_type_t> supported_sai_objects = {
+        SAI_OBJECT_TYPE_PORT,
+        SAI_OBJECT_TYPE_LAG,
+        SAI_OBJECT_TYPE_TAM,
+        SAI_OBJECT_TYPE_TAM_INT,
+        SAI_OBJECT_TYPE_TAM_COLLECTOR,
+        SAI_OBJECT_TYPE_TAM_REPORT,
+        SAI_OBJECT_TYPE_TAM_TRANSPORT,
+        SAI_OBJECT_TYPE_TAM_TELEMETRY,
+        SAI_OBJECT_TYPE_TAM_EVENT_THRESHOLD
+    };
+
+    sai_status_t _ut_stub_sai_get_switch_attribute(
+        _In_ sai_object_id_t switch_id,
+        _In_ uint32_t attr_count,
+        _Inout_ sai_attribute_t *attr_list)
+    {
+        sai_status_t status;
+        if (attr_count == 1 && attr_list[0].id == SAI_SWITCH_ATTR_SUPPORTED_OBJECT_TYPE_LIST)
+        {
+            uint32_t i;
+            for (i = 0; i < attr_list[0].value.s32list.count && i < supported_sai_objects.size(); i++)
+            {
+                attr_list[0].value.s32list.list[i] = supported_sai_objects[i];
+            }
+            attr_list[0].value.s32list.count = i;
+            status = SAI_STATUS_SUCCESS;
+        }
+        else
+        {
+            status = pold_sai_switch_api->get_switch_attribute(switch_id, attr_count, attr_list);
+        }
+        return status;
+    }
+
     uint32_t *_sai_syncd_notifications_count;
     int32_t *_sai_syncd_notification_event;
     uint32_t _sai_switch_dlr_packet_action_count;
@@ -147,6 +182,7 @@ namespace portsorch_test
         ut_sai_switch_api = *sai_switch_api;
         pold_sai_switch_api = sai_switch_api;
         ut_sai_switch_api.set_switch_attribute = _ut_stub_sai_set_switch_attribute;
+        ut_sai_switch_api.get_switch_attribute = _ut_stub_sai_get_switch_attribute;
         sai_switch_api = &ut_sai_switch_api;
     }
 
@@ -322,7 +358,9 @@ namespace portsorch_test
 
             ASSERT_EQ(gPortsOrch, nullptr);
 
+            _hook_sai_switch_api();
             gPortsOrch = new PortsOrch(m_app_db.get(), m_state_db.get(), ports_tables, m_chassis_app_db.get());
+            _unhook_sai_switch_api();
 
             vector<string> flex_counter_tables = {
                 CFG_FLEX_COUNTER_TABLE_NAME