if val != nil && val.Resource.TypeUrl != fmt.Sprint(n.Load()) {
				t.Fatalf("got bad write: %v", val.Resource.TypeUrl)
			}
			time.Sleep(time.Millisecond * time.Duration(rand.Intn(20)))
		}
	}
}

func TestXdsCache(t *testing.T) {
	makeEp := func(subset string, dr *model.ConsolidatedDestRule) *endpoints.EndpointBuilder {
		svc := &model.Service{Hostname: "foo.com"}
		b := endpoints.NewCDSEndpointBuilder(
			proxy, nil,