public function testFormKeyUsing()
{
$formKey = 'form-key';
$this->_formKeyMock->expects($this->once())->method('getFormKey')->will($this->returnValue($formKey));
$this->_form->setUseContainer(true);
$this->_form->setMethod('post');
$this->assertContains($formKey, $this->_form->toHtml());
}