public function testCanUnsetDataForKey()
{
$formId = $this->getFormIdMock();
$form = new Form($formId);
$form->set('test-key', 'test-value');
$this->assertEquals('test-value', $form->get('test-key'));
$form->unset('test-key');
$this->assertNull($form->get('test-key'));
}