Symfony\Component\Validator\ConstraintViolationList::__toString PHP Method

    public function __toString()
    {
        $string = '';

        foreach ($this->violations as $violation) {
            $string .= $violation . "\n";
        }

        return $string;
    }

 function it_throws_exception_on_validation_failure(MethodInterface $method, ValidatorInterface $validator, ConstraintViolationList $violations)
 {
     $attributes = ['field' => 'value'];
     $constraints = ['constraints'];
     $method->getValidationConstraints()->shouldBeCalled()->willReturn($constraints);
     $method->getAttributes()->shouldBeCalled()->willReturn($attributes);
     $violations->count()->willReturn(1);
     $violations->__toString()->willReturn('');
     $validator->validate($attributes, $constraints)->willReturn($violations);
     $this->shouldThrow('Cardinity\\Exception\\InvalidAttributeValue')->duringValidate($method);
 }