// create IPv6 allocator
	cidrIPv6 := "2001:db8::/112"
	_, clusterCIDRv6, _ := netutils.ParseCIDRSloppy(cidrIPv6)
	b, err := newTestAllocator(clusterCIDRv6)
	if err != nil {
		t.Fatalf("unexpected error creating CidrSet: %v", err)
	}
	b.EnableMetrics()

	// Check initial state
	em := testMetrics{
		free:      0,
		used:      0,
		allocated: 0,
		errors:    0,
	}
	expectMetrics(t, cidrIPv4, em)