return input, nil, nil
		}, input)
	if err != nil {
		t.Fatalf("Update failed: %v", err)
	}
	if out.ResourceVersion == initial.ResourceVersion {
		t.Errorf("guaranteed update should have updated the serialized data, got %#v", out)
	}

	lastVersion := out.ResourceVersion

	// this update should not write to etcd because the input matches the stored data
	input = out
	out = &example.Pod{}