Fundamental do not understand mocks?

Question

PHPUnit

Guys, hello everyone. A question about unit tests, since I dealt with integration tests quite well)
There is a service method that puts a certain number of jobs in a queue. This method takes an interface as an argument.

Method

public function createThumbnails(PartnerSettingRepositoryInterface $partnerSettingRepository)
    {
        $seconds = 2;

        foreach ($this->emailTemplateRepository->getTemplates() as $template) {
            $job = new CreateCustomTemplatesThumbnail($template, $this, $partnerSettingRepository);
            $job->delay(now()->addSeconds($seconds));
            $job->onQueue(config('queue.connects.files'));

            dispatch($job);

            $seconds += 2;
        }
    }

I am writing a test which should check this method.

function it_should_push_create_thumbnails_queue()
    {
        Queue::fake();

        $tmp = factory(EmailTemplate::class)->make();

        $emailTemplateRepository = $this->getMockBuilder(EmailTemplateRepository::class)
            ->disableOriginalConstructor()
            ->onlyMethods(['getTemplates'])
            ->getMock();

        $emailTemplateRepository->expects($this->once())->method('getTemplates')
            ->withAnyParameters()
            ->willReturn(collect($tmp));

        $emailTemplateRepository->getTemplates();

        //До вот этого момента все работает, все что ниже - ломается.

        $service = $this->createMock(EmailThumbnailService::class);
        $service->expects($this->once())->willReturnSelf();

        $partnerSettingRepositoryInterface = $this->getMockBuilder(PartnerSettingRepositoryInterface::class);
        $partnerSettingRepositoryInterface->onlyMethods([])->getMock();
        $service->createThumbnails($partnerSettingRepositoryInterface);

        Queue::assertPushedOn(
            config('queue.connects.files'),
            CreateCustomTemplatesThumbnail::class
        );
    }

I get
TypeError: Argument 1 passed to Mock_EmailThumbnailService_6dcb9b1d::createThumbnails() must implement interface App\Repositories\Settings\PartnerSettingRepositoryInterface, instance of PHPUnit\Framework\MockObject\MockBuilder given, called in /var/project/tests/Unit/Services/Newsletter /EmailThumbnailServiceTest.php on line 138

I'm asking for help, even advice. I'm still having trouble with tests, especially mocks. But I really want to understand how it works. Can you provide a link to a relevant article?

Answer 1

The problem should go away if you create mocks in setUp, and already configure them in the tests themselves.