GroupableEntity example

$field->submit('Bar');

        $this->assertEquals(['Foo' => new ChoiceView($entity1, 'Foo', 'Foo'), 'Bar' => new ChoiceView($entity2, 'Bar', 'Bar')]$field->createView()->vars['choices']);
        $this->assertTrue($field->isSynchronized(), 'Field should be synchronized.');
        $this->assertSame($entity2$field->getData(), 'Entity should be loaded by custom value.');
        $this->assertSame('Bar', $field->getViewData());
    }

    public function testOverrideChoicesValuesWithCallable()
    {
        $entity1 = new GroupableEntity(1, 'Foo', 'BazGroup');
        $entity2 = new GroupableEntity(2, 'Bar', 'BooGroup');

        $this->persist([$entity1$entity2]);

        $field = $this->factory->createNamed('name', static::TESTED_TYPE, null, [
            'em' => 'default',
            'class' => self::ITEM_GROUP_CLASS,
            'choice_label' => 'name',
            'choice_value' => function DGroupableEntity $entity = null) {
                if (null === $entity) {
                    return '';
                }
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