public void And_custom_conversion_function_is_specified_it_should_be_used()
{
var settings = new AppSettings(SimpleConfig.AbsolutePathToConfigFile);
var functionCalled = false;
settings.GetOptionalValue<int>(SimpleConfig.IntValue, 100, (setting, settingValue) => { functionCalled = true; return 0; });
Assert.IsTrue(functionCalled);
}