SIENTIAPDE-994

Refactor tests for Postgres activities and improve error handling

- Updated test_postgres.py to enhance the testing of load_custom_query method, including cases for None data and date conversion.
- Refactored repeat_last_prediction tests to use mocks for SQLAlchemy session execution.
- Added tests for export_data_to_postgres method, covering both success and error scenarios.
- Improved the initialization tests for Activities class to ensure proper instantiation of dependencies.
- Enhanced test coverage for OPC repository connection validation.
- Updated tests for prediction workflows to streamline input handling and improve clarity.
- Introduced tests for connectors configuration to validate environment variable handling for MLFlow, OPC, and Postgres.
- Added tests for logger utility to ensure default settings are correctly applied.

tests/laborious/utils/test_logger.py

@@ -0,0 +1,37 @@
+import os
+from unittest.mock import patch
+import logging
+import pytest
+from laborious.utils.logger import get_logger
+
+
+@pytest.fixture
+def mock_env_vars():
+    with patch.dict(os.environ, {}, clear=True):
+        yield
+
+
+@pytest.mark.usefixtures("mock_env_vars")
+@patch('laborious.utils.logger.logging.Formatter')
+@patch('laborious.utils.logger.logging.StreamHandler')
+def test_get_logger_defaults(mock_stream_handler, mock_formatter):
+    """Test logger creation with default settings"""
+    # Mock the StreamHandler and Formatter
+
+    logger = get_logger('test_logger')
+
+    # Verify logger settings
+    assert logger.name == 'test_logger'
+    assert logger.level == logging.INFO
+
+    # Verify handler configuration
+    mock_stream_handler.return_value.setLevel.assert_called_once_with('INFO')
+    mock_stream_handler.return_value.setFormatter.assert_called_once()
+
+    # Verify formatter configuration
+    mock_formatter.assert_called_once_with(
+        '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
+    )
+
+    # Verify handler was added to logger
+    assert len(logger.handlers) == 1