diff --git a/tests/conftest.py b/tests/conftest.py
index 4016ff0..46bccca 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1 +1,15 @@
-# Env var setup that must run before app.config is imported.
+from collections.abc import AsyncIterator
+
+import httpx
+import pytest
+from app.config import Settings
+from app.main import create_app
+from app.store import MonitorStore
+
+
+@pytest.fixture
+async def client() -> AsyncIterator[httpx.AsyncClient]:
+    app = create_app(settings=Settings(), store=MonitorStore())
+    transport = httpx.ASGITransport(app=app)
+    async with httpx.AsyncClient(transport=transport, base_url="http://test") as value:
+        yield value