PropertyConstraint example

public function testAddConstraintDoesNotAcceptValid()
    {
        $this->expectException(ConstraintDefinitionException::class);

        $this->metadata->addConstraint(new Valid());
    }

    public function testAddConstraintRequiresClassConstraints()
    {
        $this->expectException(ConstraintDefinitionException::class);

        $this->metadata->addConstraint(new PropertyConstraint());
    }

    public function testAddCompositeConstraintRejectsNestedPropertyConstraints()
    {
        $this->expectException(ConstraintDefinitionException::class);
        $this->expectExceptionMessage('The constraint "Symfony\Component\Validator\Tests\Fixtures\PropertyConstraint" cannot be put on classes.');

        $this->metadata->addConstraint(new ClassCompositeConstraint([new PropertyConstraint()]));
    }

    public function testAddCompositeConstraintAcceptsNestedClassConstraints()
    {

public function testAddCompositeConstraintRejectsDeepNestedClassConstraints()
    {
        $this->expectException(ConstraintDefinitionException::class);
        $this->expectExceptionMessage('The constraint "Symfony\Component\Validator\Tests\Fixtures\ClassConstraint" cannot be put on properties or getters.');

        $this->metadata->addConstraint(new Collection(['field1' => new Required([new ClassConstraint()])]));
    }

    public function testAddCompositeConstraintAcceptsNestedPropertyConstraints()
    {
        $this->metadata->addConstraint($constraint = new PropertyCompositeConstraint([new PropertyConstraint()]));
        $this->assertSame($this->metadata->getConstraints(), [$constraint]);
    }

    public function testAddCompositeConstraintAcceptsDeepNestedPropertyConstraints()
    {
        $this->metadata->addConstraint($constraint = new Collection(['field1' => new Required([new PropertyConstraint()])]));
        $this->assertSame($this->metadata->getConstraints(), [$constraint]);
    }

    public function testSerialize()
    {