Laravel-PHPUnit沒辦法Mock物件

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Laravel專案中寫測試，遇到怎樣都沒辦法Mock其他物件，原因可能是這個物件早就被實現了。

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class ComboCategoryServiceTest extends TestCase
{
    private $combo;
    private $service;

    public function setUp()
    {
        parent::setUp();
        $this->combo  = factory(ComboCategory::class)->create(['id' => 1]);
        $this->service = app()->make(\App\Services\ComboCategoryService::class);
    }

    public function testSearchByFrontForCombo()
    {
        $mockHotel = Mockery::mock(\App\Repositories\HotelRepository::class);
        $this->app->instance(\App\Repositories\HotelRepository::class, $mockHotel);
        $mockHotel->shouldReceive('findByDomainOrFail')
            ->andReturn((object)['id' => 2])
            ->once();

        //Mock其他物件之後，再make 一次
        // $this->service = app()->make(ComboCategoryService::class);

        $inputs = [
            'domain' => get_domain(),
            'combo_category' => $this->combo->id
        ];

        $result = $this->service->searchByFrontForCombo($inputs);
        $this->assertEquals($this->combo->id, $result->first()->id);
    }
}

這個function會呼叫findByDomainOrFail，但是在這裡執行的時候，其實他都沒有被Mock

這是因為早在setUp早就實現ComboCategoryService:class，此建構子又實現HotelRepository::class

在這之後怎麼Mock,instance都沒有用。

結論:要在呼叫之前就Mock,instance，或是再實現一次方法。

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$this->service = app()->make(ComboCategoryService::class);