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

tests/conftest.py

@@ -0,0 +1,37 @@
+from collections.abc import AsyncIterator
+
+import pytest
+import pytest_asyncio
+from asgi_lifespan import LifespanManager
+from fastapi import FastAPI
+from httpx import ASGITransport, AsyncClient
+
+from src.config import Settings
+from src.main import create_app
+
+
+@pytest.fixture
+def settings() -> Settings:
+    return Settings(
+        postgres={"host": "127.0.0.1", "port": 1},
+        minio={"endpoint": "127.0.0.1:1"},
+        ingestion={"timeout_seconds": 1.0},
+        qdrant={"url": "http://127.0.0.1:1"},
+        app={"readiness_check_timeout_seconds": 0.5},
+    )
+
+
+@pytest.fixture
+def app(settings: Settings) -> FastAPI:
+    return create_app(settings)
+
+
+@pytest_asyncio.fixture
+async def client(app: FastAPI) -> AsyncIterator[AsyncClient]:
+    async with (
+        LifespanManager(app) as manager,
+        AsyncClient(
+            transport=ASGITransport(app=manager.app), base_url="http://test"
+        ) as async_client,
+    ):
+        yield async_client