public function testRender($registryArray = [], $extraId = null, $expectArray = [])
{
/* setup */
$this->_registry->init($registryArray);
$extraForm = new Admin\View\ExtraForm($this->_registry, $this->_language);
/* actual */
$actual = $extraForm->render($extraId);
/* compare */
$this->assertStringStartsWith($expectArray['start'], $actual);
$this->assertStringEndsWith($expectArray['end'], $actual);
}