Instances: instances,
				Configs:   cfgs,
			})
			clusters := cg.Clusters(cg.SetupProxy(nil))
			xdstest.ValidateClusters(t, clusters)
			if c.filter != nil {
				clusters = xdstest.FilterClusters(clusters, c.filter)
			}
			g.Expect(len(clusters)).ShouldNot(Equal(0))

			for _, cluster := range clusters {
				g.Expect(cluster.CircuitBreakers).NotTo(BeNil())