public void Year_InvalidArgument_ExceptionThrown()
{
// act& assert
var argumentException = HelperExtensions.Throws <ArgumentException>(() => new Year(_fixture.Create <string>()));
}
public void Year_NullArgument_ExceptionThrown()
{
// act & assert
var argumentException = HelperExtensions.Throws <ArgumentException>(() => new Year(null));
}