public function setUp()
{
$this->mockFlashMessageContainer = $this->createMock(\Neos\Flow\Mvc\FlashMessageContainer::class);
$mockControllerContext = $this->getMockBuilder(\Neos\Flow\Mvc\Controller\ControllerContext::class)->disableOriginalConstructor()->getMock();
$mockControllerContext->expects($this->any())->method('getFlashMessageContainer')->will($this->returnValue($this->mockFlashMessageContainer));
$this->mockTagBuilder = $this->createMock(TagBuilder::class);
$this->viewHelper = $this->getAccessibleMock(\Neos\FluidAdaptor\ViewHelpers\FlashMessagesViewHelper::class, array('dummy'));
$this->viewHelper->_set('controllerContext', $mockControllerContext);
$this->viewHelper->_set('tag', $this->mockTagBuilder);
$this->viewHelper->initialize();
}