public function testValidationFailure()
 {
     $form = new Admin_Form_Collection();
     $this->assertFalse($form->isValid(array()));
     $errors = $form->getErrors('Name');
     $this->assertNotNull($errors);
     $this->assertContains('allElementsEmpty', $errors);
     $errors = $form->getErrors('Number');
     $this->assertNotNull($errors);
     $this->assertContains('allElementsEmpty', $errors);
 }