protected function callUserFunction($function, $caller)
{
$drawItem = TRUE;
$headerContent = '';
$itemContent = '';
$row = Records::$contentRecordWithoutParentAndWithoutChildren;
$row['pi_flexform'] = Xml::SIMPLE_FLEXFORM_SOURCE_DEFAULT_SHEET_ONE_FIELD;
Core::registerConfigurationProvider('FluidTYPO3\\Flux\\Tests\\Fixtures\\Classes\\DummyConfigurationProvider');
$instance = $this->getMock($function, array('attachAssets'));
$instance->preProcess($caller, $drawItem, $headerContent, $itemContent, $row);
Core::unregisterConfigurationProvider('FluidTYPO3\\Flux\\Tests\\Fixtures\\Classes\\DummyConfigurationProvider');
}