public void Created_new_instance_when_call_update_method_and_key_not_found()
        {
            var key = Guid.NewGuid();

            var newValue = _guidKeyClassWriter.UpdateEnforcingNew(key, tv => { tv.Value += 1; });

            var defaultValue = default(int);

            (defaultValue + 1).Should().Be(newValue.Value);
        }