Expand user directory for basepath in extra_models_paths.yaml (#4857)

* Expand user path.

* Add test.

* Add unit test for expanding base path.

* Simplify unit test.

* Remove comment.

* Remove comment.

* Checkpoints.

* Refactor.

tests-unit/utils/extra_config_test.py

@@ -0,0 +1,69 @@
+import pytest
+import yaml
+import os
+from unittest.mock import Mock, patch, mock_open
+
+from utils.extra_config import load_extra_path_config
+import folder_paths
+
+@pytest.fixture
+def mock_yaml_content():
+    return {
+        'test_config': {
+            'base_path': '~/App/',
+            'checkpoints': 'subfolder1',
+        }
+    }
+
+@pytest.fixture
+def mock_expanded_home():
+    return '/home/user'
+
+@pytest.fixture
+def mock_add_model_folder_path():
+    return Mock()
+
+@pytest.fixture
+def mock_expanduser(mock_expanded_home):
+    def _expanduser(path):
+        if path.startswith('~/'):
+            return os.path.join(mock_expanded_home, path[2:])
+        return path
+    return _expanduser
+
+@pytest.fixture
+def mock_yaml_safe_load(mock_yaml_content):
+    return Mock(return_value=mock_yaml_content)
+
+@patch('builtins.open', new_callable=mock_open, read_data="dummy file content")
+def test_load_extra_model_paths_expands_userpath(
+    mock_file,
+    monkeypatch,
+    mock_add_model_folder_path, 
+    mock_expanduser, 
+    mock_yaml_safe_load,
+    mock_expanded_home
+):
+    # Attach mocks used by load_extra_path_config
+    monkeypatch.setattr(folder_paths, 'add_model_folder_path', mock_add_model_folder_path)
+    monkeypatch.setattr(os.path, 'expanduser', mock_expanduser)
+    monkeypatch.setattr(yaml, 'safe_load', mock_yaml_safe_load)
+
+    dummy_yaml_file_name = 'dummy_path.yaml'
+    load_extra_path_config(dummy_yaml_file_name)
+
+    expected_calls = [
+        ('checkpoints', os.path.join(mock_expanded_home, 'App', 'subfolder1')),
+    ]
+
+    assert mock_add_model_folder_path.call_count == len(expected_calls)
+    
+    # Check if add_model_folder_path was called with the correct arguments
+    for actual_call, expected_call in zip(mock_add_model_folder_path.call_args_list, expected_calls):
+        assert actual_call.args == expected_call
+
+    # Check if yaml.safe_load was called
+    mock_yaml_safe_load.assert_called_once()
+
+    # Check if open was called with the correct file path
+    mock_file.assert_called_once_with(dummy_yaml_file_name, 'r')