ResizeFormListener example

        return $this->getBuilder($name)->getForm();
    }

    public function testPreSetDataResizesForm()
    {
        $this->form->add($this->getForm('0'));
        $this->form->add($this->getForm('1'));

        $data = [1 => 'string', 2 => 'string'];
        $event = new FormEvent($this->form, $data);
        $listener = new ResizeFormListener(TextType::class, ['attr' => ['maxlength' => 10]], false, false);
        $listener->preSetData($event);

        $this->assertFalse($this->form->has('0'));
        $this->assertTrue($this->form->has('1'));
        $this->assertTrue($this->form->has('2'));
    }

    public function testPreSetDataRequiresArrayOrTraversable()
    {
        $this->expectException(UnexpectedTypeException::class);
        $data = 'no array or traversable';
        

'label' => $options['prototype_name'].'label__',
            ], $resizePrototypeOptions);

            if (null !== $options['prototype_data']) {
                $prototypeOptions['data'] = $options['prototype_data'];
            }

            $prototype = $builder->create($options['prototype_name'], $options['entry_type'], $prototypeOptions);
            $builder->setAttribute('prototype', $prototype->getForm());
        }

        $resizeListener = new ResizeFormListener(
            $options['entry_type'],
            $options['entry_options'],
            $options['allow_add'],
            $options['allow_delete'],
            $options['delete_empty'],
            $resizePrototypeOptions
        );

        $builder->addEventSubscriber($resizeListener);
    }