diff --git a/tests/conftest.py b/tests/conftest.py
index b3b4727..4016ff0 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,25 +1 @@
-from collections.abc import AsyncIterator
-
-import httpx
-import pytest
-from httpx import ASGITransport, AsyncClient
-
-from monitor_service.api import create_app
-from monitor_service.checker import CheckOutcome
-from monitor_service.config import Settings
-from monitor_service.models import CurrentStatus, MonitorState, utc_now
-
-
-class StubChecker:
-    async def check(self, monitor_id: object, url: str) -> CheckOutcome:
-        return CheckOutcome(url.split("?", 1)[0], CurrentStatus(
-            state=MonitorState.up, checked_at=utc_now(), latency_ms=1.25, http_status=204
-        ))
-
-
-@pytest.fixture
-async def client() -> AsyncIterator[AsyncClient]:
-    app = create_app(Settings(), checker=StubChecker())  # type: ignore[arg-type]
-    async with app.router.lifespan_context(app):
-        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as api:
-            yield api
+# Env var setup that must run before app.config is imported.