protected function setUp()
 {
     parent::setUp();
     $this->mockContentObject = $this->getMock(ContentObjectRenderer::class, array(), array(), '', false);
     $this->viewHelper = $this->getMock(\TYPO3\CMS\Fluid\ViewHelpers\Format\CropViewHelper::class, array('renderChildren'));
     $renderingContext = $this->getMock(\TYPO3\CMS\Fluid\Tests\Unit\Core\Rendering\RenderingContextFixture::class);
     $this->viewHelper->setRenderingContext($renderingContext);
     $this->viewHelper->expects($this->once())->method('renderChildren')->will($this->returnValue('Some Content'));
 }