test(core): add coverage for config and logging modules

Adds tests for VeritextSettings defaults, env var overrides, and the
get_logger/configure_logging functions.

tests/test_core/test_logging.py

@@ -0,0 +1,56 @@
+"""Tests for logging module."""
+
+from veritext.core.logging import configure_logging, get_logger
+
+
+class TestGetLogger:
+    """Tests for get_logger function."""
+
+    def test_get_logger_returns_logger(self) -> None:
+        """Test get_logger returns a logger instance."""
+        logger = get_logger()
+        assert logger is not None
+
+    def test_get_logger_default_name(self) -> None:
+        """Test get_logger uses 'veritext' as default name."""
+        logger = get_logger()
+        # The logger should be a bound logger from structlog
+        assert hasattr(logger, "info")
+        assert hasattr(logger, "debug")
+        assert hasattr(logger, "warning")
+        assert hasattr(logger, "error")
+
+    def test_get_logger_custom_name(self) -> None:
+        """Test get_logger respects custom name parameter."""
+        logger = get_logger("custom.module")
+        assert logger is not None
+        assert hasattr(logger, "info")
+
+
+class TestConfigureLogging:
+    """Tests for configure_logging function."""
+
+    def test_configure_logging_console_format(self) -> None:
+        """Test configure_logging with console format does not raise."""
+        configure_logging(level="INFO", log_format="console")
+        logger = get_logger()
+        assert logger is not None
+
+    def test_configure_logging_json_format(self) -> None:
+        """Test configure_logging with json format does not raise."""
+        configure_logging(level="DEBUG", log_format="json")
+        logger = get_logger()
+        assert logger is not None
+
+    def test_configure_logging_uses_defaults(self) -> None:
+        """Test configure_logging uses settings defaults when not provided."""
+        configure_logging()
+        logger = get_logger()
+        assert logger is not None
+
+    def test_configure_logging_different_levels(self) -> None:
+        """Test configure_logging accepts different log levels."""
+        for level in ("DEBUG", "INFO", "WARNING", "ERROR"):
+            configure_logging(level=level)
+            logger = get_logger()
+            assert logger is not None