Php 如何在测试中正确使用Symfony验证器？

我有一个服务班：

class OutletTableWriter
{
    private $validator;

    private $entityManager;

    public function __construct(ValidatorInterface $validator, EntityManagerInterface $em)
    {
        $this->validator    = $validator;
        $this->em           = $em;

    }
// inserts outlet to db
    public function insertOutlet($outletName, $buildingName = null, $propertyNumber, $streetName, $area, $town, $contactNumber, $postcode)
    {
        $outlet = new Outlet();
        $outlet->setOutletName($outletName);
        $outlet->setBuildingName($buildingName);
        $outlet->setPropertyNumber($propertyNumber);
        $outlet->setStreetName($streetName);
        $outlet->setArea($area);
        $outlet->setTown($town);
        $outlet->setContactNumber($contactNumber);
        $outlet->setPostCode($postcode);
        $outlet->setIsActive(0);

        // $validator = $this->get('validator'); // validate constraints
        $errors = $this->validator->validate($outlet);
        if (count($errors) > 0) {
            $response = new Response('', 422, array('content-type' => 'text/html'));

            $errorsString = (string) $errors;
            $response->setContent($errorsString);
            return $response;
        }

        $this->em->persist($outlet);
        $this->em->flush(); // save

        return new Response('Outlet #'.$outlet->getId().' has been successfully saved.', 201);
    }

这正如预期的那样有效。但是，我在测试这个类的功能时遇到了问题。我有以下测试方法：

public function testUnsuccessfulInsertOutlet()
    {
        $mockValidator  = $this->getMockBuilder(ValidatorInterface::class)
            ->disableOriginalConstructor()
            ->getMock();

        $mockEm         = $this->getMockBuilder(EntityManagerInterface::class)
            ->disableOriginalConstructor()->getMock();


        $outletTableWriter  = new OutletTableWriter($mockValidator, $mockEm);
        $response           = $outletTableWriter->insertOutlet(
            '', '', '', '', '', '', 'EXX 1XX'
        );

        $this->assertEquals(422, $response->getStatusCode());
    }

验证器应该失败，因为似乎没有进行验证（返回201响应）。我觉得这与我模仿validator类的方式有关（它甚至需要被模仿吗？-我尝试只传入类本身的一个对象，这导致了以下异常：

错误：无法实例化接口Symfony\Component\validator\validator\validator接口

我使用的是Symfony 3.4.6

---

感谢您的建议。

我认为您必须告诉验证器在调用“validate”方法时应该做什么

    $errors = ['some_error'];
    $validatorMock = $this->createMock(ValidatorInterface::class);
    $validatorMock->expects($this->once())->method('validate')->with($outlet)->willReturn($errors);

---

根据该用户的经验，我让验证器在测试类中工作：

因此，在我的测试中，我做了以下更改（在实例化验证器时）：

use Symfony\Component\Validator\Validation;

$this->validator    = Validation::createValidatorBuilder()->enableAnnotationMapping()->getValidator();