Add negative test

config/main.py

@@ -1394,11 +1394,7 @@ def config_file_yang_validation(filename):
     config = read_json_file(filename)
 
     # Check if the config is empty
-    if not config:
-        return False
-
-    # Check if the config is not a dictionary
-    if not isinstance(config, dict):
+    if not config or not isinstance(config, dict):
         return False
 
     # If the device is multi-ASIC, check if all required namespaces exist

tests/config_test.py

@@ -1169,6 +1169,20 @@ def is_file_side_effect(filename):
             assert result.exit_code == 0
             assert "config override-config-table /etc/sonic/golden_config_db.json" in result.output
 
+    @mock.patch('sonic_py_common.device_info.get_paths_to_platform_and_hwsku_dirs', mock.MagicMock(return_value=("dummy_path", None)))
+    def test_load_minigraph_with_invalid_golden_config(self, get_cmd_module):
+        def is_file_side_effect(filename):
+            return True if 'golden_config' in filename else False
+
+        with mock.patch("utilities_common.cli.run_command", mock.MagicMock(side_effect=mock_run_command_side_effect)) as mock_run_command, \
+                mock.patch('os.path.isfile', mock.MagicMock(side_effect=is_file_side_effect)), \
+                mock.patch('config.main.read_json_file', mock.MagicMock(return_value={})):
+            (config, show) = get_cmd_module
+            runner = CliRunner()
+            result = runner.invoke(config.config.commands["load_minigraph"], ["--override_config", "-y"])
+            assert result.exit_code != 0
+            assert "Invalid golden config file:" in result.output
+
     @mock.patch('sonic_py_common.device_info.get_paths_to_platform_and_hwsku_dirs',
                 mock.MagicMock(return_value=("dummy_path", None)))
     def test_load_minigraph_hard_dependency_check(self, get_cmd_module):