使用 phpunit 和 Mockery 模拟 Laravel 5.2 本地范围

Question

我正在使用 Laravel 5.2、phpunit 5.0.0 和 PHP 7.0.3，并尝试编写一个涉及 Eloquent 模型范围方法的数据库交互测试。

我有一个类似的东西：

class Picture extends Illuminate\Database\Eloquent\Model {
    ...
    public function scopeGetPictureNameById($oQuery, $pictureHId) {
         return $oQuery->select('name')->where('h_id', '=',   $pictureHId)->first()->name;
    }
}

class someHelperClass {
    public function someMethod($pictureId) {
        $pictureName = Picture::getPictureNameById($pictureId);
        return "name is " . $pictureName;
    }
}


class SomeTest extends TestCase {

    use DatabaseMigrations;

    protected $someHelper;

    public function setUp() {
        parent::setUp();
        $this->someHelper = new SomeHelper();
    }

    /**
     * @test
     */
    public function someMethodTest() {
        $expectedName = "test";
        $this->assertEquals("name is " . $expectedName, $this->someHelper->someMethod());
    }
}

我使用名称设置为“test”的图片记录为数据库播种。

我首先想到的是不必模拟范围调用，因为我只需要在数据库中。而且由于我在测试之外工作的（非简化）代码，我猜想范围调用在 phpunit 中不起作用。 （我得到一个“试图获取非对象的属性”异常）。

好的，所以我尝试用 Mockery 模拟调用：

class SomeTest extends TestCase {

    use DatabaseMigrations;

    protected $someHelper;

    public function setUp() {
        parent::setUp();
        $this->someHelper = new SomeHelper();
    }

    /**
     * @test
     */
    public function someMethodTest() {
        $expectedName = "test";

        $mockedPicture = Mockery::mock('overload:App\Models\Picture');
        $mockedPicture->shouldReceive('getPictureNameById')->andReturn('test');

        //also tried this: $mockedPicture->shouldReceive('scopeGetPictureNameById')->andReturn('test');


        $this->assertEquals("name is " . $expectedName, $this->someHelper->someMethod());
    }
}

我得到的只是“无法加载模拟 App\Models\Picture，类已经存在”。那么如何正确模拟像 Picture::getPictureNameById($pictureId) 这样的查询范围调用？

Answer 1

我会使用依赖注入而不是静态调用 Picture 类的方法。所以是这样的：

class someHelperClass {

    protected $picture;

    public function __construct(Picture $picture) {
        $this->picture = $picture;
    }

    public function someMethod($pictureId) {
        $pictureName = $this->picture->getPictureNameById($pictureId);
        return "name is " . $pictureName;
    }
}

然后在你的测试中：

public function someMethodTest() {
    $expectedName = "test";

    $mockedPicture = Mockery::mock('App\Models\Picture');
    $mockedPicture->shouldReceive('getPictureNameById')->andReturn('test');
    $someHelper = new SomeHelper($mockedPicture);

    $this->assertEquals("name is " . $expectedName, $someHelper->someMethod(1));
}