Add tests for logging.py

tests/test_logging.py

@@ -0,0 +1,38 @@
+import logging
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from metrontagger.logging import init_logging
+from metrontagger.settings import MetronTaggerSettings
+
+LOG_FMT = "{asctime} - {name} - {levelname} - {message}"
+DATE_FMT = "%Y-%m-%d %H:%M:%S"
+
+
+def test_init_logging_happy_path(tmp_path):
+    # Arrange
+    config = MagicMock(spec=MetronTaggerSettings)
+    config.get_settings_folder.return_value = tmp_path
+
+    # Act
+    with patch("logging.FileHandler") as mock_file_handler:
+        init_logging(config)
+
+    # Assert
+    mock_file_handler.assert_called_once_with(str(tmp_path / "metron-tagger.log"))
+    assert logging.getLogger().level == logging.WARNING
+
+
+@pytest.mark.parametrize(
+    ("config", "expected_exception"),
+    [
+        (None, AttributeError),
+        (MagicMock(spec=object), AttributeError),
+    ],
+    ids=["none_config", "invalid_config"],
+)
+def test_init_logging_error_cases(config, expected_exception):
+    # Act
+    with pytest.raises(expected_exception):
+        init_logging(config)