mgw := MergeGateways(instances, &Proxy{}, nil)
	hosts := mgw.GetAutoPassthrughGatewaySNIHosts()
	expectedHosts := sets.Set[string]{}
	expectedHosts.InsertAll("a.apps.svc.cluster.local", "b.apps.svc.cluster.local")
	if !hosts.Equals(expectedHosts) {
		t.Errorf("expected to get: [a.apps.svc.cluster.local,b.apps.svc.cluster.local], got: %s", hosts.String())
	}
}