package dns import ( "net" "testing" ) func TestCache(t *testing.T) { net.DefaultResolver = NewNetResolver(PreferIPV4(true)) addrs, err := net.LookupHost("unistack.org") if err != nil { t.Fatal(err) } addrs, err = net.LookupHost("unistack.org") if err != nil { t.Fatal(err) } _ = addrs }