Add test for port breakout db config

Author: burnCalories

tests/test_config_mgmt.py

@@ -4,24 +4,32 @@
 
 sonic_cfggen = load_module_from_source('sonic_cfggen', '/usr/local/bin/sonic-cfggen')
 
-def test_output_to_db_and_mod_config(mocker):
-    mock_db_data = {
+def test_write_configdb_port_breakout(mocker):
+
+    mock_port_db = {
         'PORT': {
-            'Ethernet0': {'admin_status': 'up'},
-            'Ethernet4': {'admin_status': 'down'}
+            'Ethernet80': {'admin_status': 'up'},
+            'Ethernet82': {'admin_status': 'down'}
         }
     }
 
-    mocker.patch('sonic_cfggen.FormatConverter.output_to_db', return_value=mock_db_data)
+    mocker.patch('sonic_cfggen.FormatConverter.to_deserialized', return_value={})
+
+    mock_output_to_db = mocker.patch('sonic_cfggen.FormatConverter.output_to_db', return_value=mock_port_db)
 
-    mock_mod_config = mocker.patch.object(ConfigMgmt, 'mod_config')
+    mocker.patch('sonic_cfggen.deep_update')
+
+    mock_mod_config = mocker.Mock()
 
     cm = ConfigMgmt()
     cm.configdb = mocker.Mock()
+    cm.configdb.mod_config = mock_mod_config
+
+    cm.writeConfigDB(jDiff={})
 
-    data = {} 
-    cm._ConfigMgmt__process_db_diff(data, {})  
+    mock_output_to_db.assert_called_once()
 
-    sonic_cfggen.FormatConverter.output_to_db.assert_called_once()
+    assert mock_mod_config.call_count == 2
 
-    assert mock_mod_config.call_count == 2
+    mock_mod_config.assert_any_call({'PORT': {'Ethernet80': {'admin_status': 'up'}}})
+    mock_mod_config.assert_any_call({'PORT': {'Ethernet82': {'admin_status': 'down'}}})