async def METHOD_NAME(c, s, a, b):
    assert s.workers[a.address].services == {"dashboard": a.http_server.port}
    assert s.workers[b.address].services == {"dashboard": b.http_server.port}
    future = c.submit(sleep, 1)
    await asyncio.sleep(0.1)
    http_client = AsyncHTTPClient()
    response = await http_client.fetch(f"http://localhost:{a.http_server.port}/system")
    assert "bokeh" in response.body.decode().lower()