/**
  * @test
  */
 public function registerTagAttributeRegistersArgumentWithNullIfNoDefaultValueIsSet()
 {
     $this->viewHelper = $this->getAccessibleMock('TYPO3\\CMS\\Fluid\\Core\\ViewHelper\\AbstractTagBasedViewHelper', array('registerArgument'), array(), '', FALSE);
     $this->viewHelper->expects($this->once())->method('registerArgument')->with('foo', 'string', 'Description', FALSE, NULL);
     $this->viewHelper->_call('registerTagAttribute', 'foo', 'string', 'Description', FALSE);
 }