}
	}
}

func testStaticAddr(t *testing.T, hostsPath string, ent staticHostEntry) {
	hosts := lookupStaticAddr(ent.in)
	for i := range ent.out {
		ent.out[i] = absDomainName(ent.out[i])
	}
	if !reflect.DeepEqual(hosts, ent.out) {
		t.Errorf("%s, lookupStaticAddr(%s) = %v; want %v", hostsPath, ent.in, hosts, ent.out)
	}
}

func TestHostCacheModification(t *testing.T) {

			ipsCp := make([]string, len(byName.addrs))
			copy(ipsCp, byName.addrs)
			return ipsCp, byName.canonicalName
		}
	}
	return nil, ""
}

// lookupStaticAddr looks up the hosts for the given address from /etc/hosts.
func lookupStaticAddr(addr string) []string {
	hosts.Lock()
	defer hosts.Unlock()
	readHosts()
	addr = parseLiteralIP(addr)
	if addr == "" {
		return nil
	}

func (r *Resolver) goLookupPTR(ctx context.Context, addr string, order hostLookupOrder, conf *dnsConfig) ([]string, error) {
	if order == hostLookupFiles || order == hostLookupFilesDNS {
		names := lookupStaticAddr(addr)
		if len(names) > 0 {
			return names, nil
		}

		if order == hostLookupFiles {
			return nil, newDNSError(errNoSuchHost, addr, "")
		}
	}

	arpa, err := reverseaddr(addr)