public function testObjectCustomise()
{
$viewableData = new ViewableDataTest_Castable();
$newViewableData = $viewableData->customise(new ViewableDataTest_RequiresCasting());
$this->assertEquals('test', $viewableData->XML_val('test'));
$this->assertEquals('casted', $viewableData->XML_val('alwaysCasted'));
$this->assertEquals('overwritten', $newViewableData->XML_val('test'));
$this->assertEquals('casted', $newViewableData->XML_val('alwaysCasted'));
}
