test: add unit test suite for config, health checks, and lifespan wiring

tests/unit/test_config.py

@@ -0,0 +1,27 @@
+from pathlib import Path
+
+import pytest
+
+from src.config import Settings
+
+pytestmark = pytest.mark.unit
+
+
+def test_settings_loads_defaults_without_env_file() -> None:
+    settings = Settings(_env_file=None)
+
+    assert settings.postgres.port == 5433
+    assert settings.minio.bucket == "chatbot-source-files"
+    assert settings.ingestion.max_concurrency == 4
+    assert settings.qdrant.url == "http://127.0.0.1:6343"
+
+
+def test_settings_parses_env_example() -> None:
+    env_example = Path(__file__).parent.parent.parent / ".env.example"
+
+    settings = Settings(_env_file=env_example)
+
+    assert settings.postgres.host == "127.0.0.1"
+    assert settings.minio.endpoint == "127.0.0.1:9100"
+    assert settings.ingestion.embed_batch_size == 128
+    assert settings.qdrant.api_key is None