t.Run("LookupIP", func(t *testing.T) {
		ips, err := r.LookupIP(ctx, "ip", fakeDomain)
		if err != nil {
			t.Fatal(err)
		}
		if got, want := sortedIPStrings(ips), []string{"0:200::e00", "1.2.3.4", "1::f", "5.6.7.8"}; !reflect.DeepEqual(got, want) {
			t.Errorf("LookupIP wrong.\n got: %q\nwant: %q\n", got, want)
		}
	})

	t.Run("LookupSRV", func(t *testing.T) {