s, err := negotiation.NegotiateInputSerializer(req, false, test.codecFactory)
			if err != nil {
				t.Fatal(err)
			}

			options := &metav1.DeleteOptions{}
			_, _, err = metainternalversionscheme.Codecs.DecoderToVersion(s.Serializer, defaultGVK.GroupVersion()).Decode(test.data, &defaultGVK, options)
			if test.expectErr != "" {
				if err == nil {
					t.Fatalf("expect %s but got nil", test.expectErr)
				}

	)

	// Ensure the storage receives the correct version.
	encoder = opts.StorageSerializer.EncoderForVersion(
		encoder,
		encodeVersioner,
	)
	decoder := opts.StorageSerializer.DecoderToVersion(
		recognizer.NewDecoder(decoders...),
		runtime.NewCoercingMultiGroupVersioner(
			opts.MemoryVersion,
			schema.GroupKind{Group: opts.MemoryVersion.Group},
			schema.GroupKind{Group: opts.StorageVersion.Group},

	return n.serializer
}

func (n *fakeNegotiater) EncoderForVersion(serializer runtime.Encoder, gv runtime.GroupVersioner) runtime.Encoder {
	return n.serializer
}

func (n *fakeNegotiater) DecoderToVersion(serializer runtime.Decoder, gv runtime.GroupVersioner) runtime.Decoder {
	return n.serializer
}

func TestConfigurableStorageFactory(t *testing.T) {
	ns := &fakeNegotiater{types: []string{"test/test"}}

	for i := range items {
		data, err := runtime.Encode(encoder, &items[i])
		if err != nil {
			b.Fatal(err)
		}
		encoded = append(encoded, data)
	}

	decoder := legacyscheme.Codecs.DecoderToVersion(s, api.SchemeGroupVersion)
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		if _, err := runtime.Decode(decoder, encoded[i%width]); err != nil {
			b.Fatal(err)
		}
	}
	b.StopTimer()
}