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_config.py

@@ -0,0 +1,73 @@
+"""Tests for configuration module."""
+
+from pathlib import Path
+
+import pytest
+
+from veritext.core.config import VeritextSettings, get_settings
+
+
+class TestVeritextSettings:
+    """Tests for VeritextSettings."""
+
+    def test_default_log_level(self) -> None:
+        """Test default log level is INFO."""
+        settings = VeritextSettings()
+        assert settings.log_level == "INFO"
+
+    def test_default_log_format(self) -> None:
+        """Test default log format is console."""
+        settings = VeritextSettings()
+        assert settings.log_format == "console"
+
+    def test_default_benchmark_path(self) -> None:
+        """Test default benchmark storage path."""
+        settings = VeritextSettings()
+        assert settings.benchmark_storage_path == Path("benchmarks")
+
+    def test_default_tokeniser_lowercase(self) -> None:
+        """Test default tokeniser lowercase setting."""
+        settings = VeritextSettings()
+        assert settings.tokeniser_lowercase is True
+
+    def test_default_tokeniser_remove_punctuation(self) -> None:
+        """Test default tokeniser remove punctuation setting."""
+        settings = VeritextSettings()
+        assert settings.tokeniser_remove_punctuation is True
+
+    def test_default_semantic_model(self) -> None:
+        """Test default semantic model name."""
+        settings = VeritextSettings()
+        assert settings.semantic_model == "all-MiniLM-L6-v2"
+
+    def test_default_semantic_cache_enabled(self) -> None:
+        """Test semantic cache is enabled by default."""
+        settings = VeritextSettings()
+        assert settings.semantic_cache_embeddings is True
+
+    def test_env_var_override(self, monkeypatch: pytest.MonkeyPatch) -> None:
+        """Test environment variable overrides default settings."""
+        monkeypatch.setenv("VERITEXT_LOG_LEVEL", "DEBUG")
+        settings = VeritextSettings()
+        assert settings.log_level == "DEBUG"
+
+    def test_env_var_override_log_format(self, monkeypatch: pytest.MonkeyPatch) -> None:
+        """Test environment variable overrides log format."""
+        monkeypatch.setenv("VERITEXT_LOG_FORMAT", "json")
+        settings = VeritextSettings()
+        assert settings.log_format == "json"
+
+
+class TestGetSettings:
+    """Tests for get_settings function."""
+
+    def test_get_settings_returns_instance(self) -> None:
+        """Test get_settings returns a VeritextSettings instance."""
+        settings = get_settings()
+        assert isinstance(settings, VeritextSettings)
+
+    def test_get_settings_returns_valid_defaults(self) -> None:
+        """Test get_settings returns instance with valid defaults."""
+        settings = get_settings()
+        assert settings.log_level in ("DEBUG", "INFO", "WARNING", "ERROR")
+        assert settings.log_format in ("console", "json")