t.Fatalf("expected 128 used IPs, got %d", x)
	}

	for _, ip := range allocated {
		if !r.Has(ip) {
			t.Fatalf("expected IP to be allocated, but it was not")
		}
	}
}

func TestClusterIPMetrics(t *testing.T) {
	clearMetrics()
	// create IPv4 allocator
	cidrIPv4 := "10.0.0.0/24"
	_, clusterCIDRv4, _ := netutils.ParseCIDRSloppy(cidrIPv4)
	a, err := NewInMemory(clusterCIDRv4)
	if err != nil {