Traverse example

$metadata = new ClassMetadata(Entity::class);

        $loader->loadClassMetadata($metadata);

        $expected = new ClassMetadata(Entity::class);
        $expected->setGroupSequence(['Foo', 'Entity']);
        $expected->addConstraint(new ConstraintA());
        $expected->addConstraint(new ConstraintB());
        $expected->addConstraint(new Callback('validateMe'));
        $expected->addConstraint(new Callback('validateMeStatic'));
        $expected->addConstraint(new Callback(['Symfony\Component\Validator\Tests\Fixtures\CallbackClass', 'callback']));
        $expected->addConstraint(new Traverse(false));
        $expected->addPropertyConstraint('firstName', new NotNull());
        $expected->addPropertyConstraint('firstName', new Range(['min' => 3]));
        $expected->addPropertyConstraint('firstName', new Choice(['A', 'B']));
        $expected->addPropertyConstraint('firstName', new All([new NotNull(), new Range(['min' => 3])]));
        $expected->addPropertyConstraint('firstName', new All(['constraints' => [new NotNull(), new Range(['min' => 3])]]));
        $expected->addPropertyConstraint('firstName', new Collection(['fields' => [
            'foo' => [new NotNull(), new Range(['min' => 3])],
            'bar' => [new Range(['min' => 5])],
        ]]));
        $expected->addPropertyConstraint('firstName', new Choice([
            'message' => 'Must be one of %choices%',
            

$this->legacyErrorMessages = $legacyErrorMessages;

        $metadata = $validator->getMetadataFor(\Symfony\Component\Form\Form::class);

        // Register the form constraints in the validator programmatically.         // This functionality is required when using the Form component without         // the DIC, where the XML file is loaded automatically. Thus the following         // code must be kept synchronized with validation.xml
        /* @var $metadata ClassMetadata */
        $metadata->addConstraint(new Form());
        $metadata->addConstraint(new Traverse(false));

        $this->validator = $validator;
        $this->formRenderer = $formRenderer;
        $this->translator = $translator;
    }

    public function loadTypeGuesser(): ?FormTypeGuesserInterface
    {
        return new ValidatorTypeGuesser($this->validator);
    }

    

public function testTraversalEnabledOnClass()
    {
        $entity = new Entity();
        $traversable = new \ArrayIterator(['key' => $entity]);

        $callback = function D$value, ExecutionContextInterface $context) {
            $context->addViolation('Message');
        };

        $traversableMetadata = new ClassMetadata('ArrayIterator');
        $traversableMetadata->addConstraint(new Traverse(true));

        $this->metadataFactory->addMetadata($traversableMetadata);
        $this->metadata->addConstraint(new Callback([
            'callback' => $callback,
            'groups' => 'Group',
        ]));

        $violations = $this->validate($traversable, new Valid(), 'Group');

        /* @var ConstraintViolationInterface[] $violations */
        $this->assertCount(1, $violations);
    }