fix: add src to pythonpath for pytest

requirements-dev.txt

@@ -0,0 +1,3 @@
+httpx==0.28.1
+pytest==8.2.0
+pytest-asyncio==0.23.6

tests/test_health.py

@@ -0,0 +1,13 @@
+import pytest
+from httpx import AsyncClient, ASGITransport
+
+from src.services.app.main import app
+
+
+@pytest.mark.asyncio
+async def test_healthz():
+    transport = ASGITransport(app=app, raise_app_exceptions=True)
+    async with AsyncClient(transport=transport, base_url="http://test") as ac:
+        resp = await ac.get("/healthz")
+    assert resp.status_code == 200
+    assert resp.json() == {"status": "pong"}