ClassCompositeConstraint example

        $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()
    {
        $this->metadata->addConstraint($constraint = new ClassCompositeConstraint([new ClassConstraint()]));
        $this->assertSame($this->metadata->getConstraints(), [$constraint]);
    }

    public function testAddPropertyConstraints()
    {
        $this->metadata->addPropertyConstraint('firstName', new ConstraintA());