Neos\FluidAdaptor\ViewHelpers\Form\TextareaViewHelper::initializeArguments PHP Method

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerTagAttribute('rows', 'int', 'The number of rows of a text area');
        $this->registerTagAttribute('cols', 'int', 'The number of columns of a text area');
        $this->registerTagAttribute('disabled', 'string', 'Specifies that the input element should be disabled when the page loads');
        $this->registerTagAttribute('placeholder', 'string', 'The placeholder of the textarea');
        $this->registerTagAttribute('autofocus', 'string', 'Specifies that a text area should automatically get focus when the page loads');
        $this->registerArgument('errorClass', 'string', 'CSS class to set if there are errors for this view helper', false, 'f3-form-error');
        $this->registerArgument('required', 'boolean', 'If the field should be marked as required or not', false, false);
        $this->registerUniversalTagAttributes();
    }

 public function setUp()
 {
     parent::setUp();
     $this->viewHelper = $this->getAccessibleMock(\Neos\FluidAdaptor\ViewHelpers\Form\TextareaViewHelper::class, array('setErrorClassAttribute', 'registerFieldNameForFormTokenGeneration'));
     $this->arguments['name'] = '';
     $this->injectDependenciesIntoViewHelper($this->viewHelper);
     $this->viewHelper->initializeArguments();
 }