for _, r := range raw {
		c := &cluster.Cluster{}
		if err := r.Resource.UnmarshalTo(c); err != nil {
			f.t.Fatal(err)
		}
		res = append(res, c)
	}
	return res
}

func (f *ConfigGenTest) DeltaClusters(
	p *model.Proxy,
	configUpdated sets.Set[model.ConfigKey],
	watched *model.WatchedResource,
) ([]*cluster.Cluster, []string, bool) {
	raw, removed, _, delta := f.ConfigGen.BuildDeltaClusters(p,

			if tc.prevConfigs != nil {
				proxy.PrevSidecarScope = &model.SidecarScope{}
				proxy.PrevSidecarScope.SetDestinationRulesForTesting(tc.prevConfigs)
			}
			clusters, removed, delta := cg.DeltaClusters(proxy, tc.configUpdated,
				&model.WatchedResource{ResourceNames: tc.watchedResourceNames})
			if delta != tc.usedDelta {
				t.Errorf("un expected delta, want %v got %v", tc.usedDelta, delta)
			}