使用 PHP 匿名 Class 进行测试和模拟

Question

我正在尝试使用匿名 class 测试和模拟一段代码。这是代码：

<?php

namespace App\Service;

use Symfony\Contracts\HttpClient\HttpClientInterface;

class FetchPromoCodeService
{
    private $client;

    public function __construct(HttpClientInterface $client)
    {
        $this->client = $client;
    }

    public function getPromoCodeList(): array
    {
        $response = $this->client->request(
            'GET', 'https://xxxxxxxxx.mockapi.io/test/list'
        );

        return $response->toArray();
    }
}

这是我的测试Class:

<?php

namespace App\Tests\Service;

use App\Service\FetchPromoCodeService;
use PHPUnit\Framework\TestCase;
use Symfony\Component\HttpFoundation\JsonResponse;

class FetchPromoCodeServiceTest extends TestCase
{

    public function testGetPromoCodeList()
    {
        $fetchPromoCodeService = new class () extends FetchPromoCodeService {
            public $client;

            public function __construct($client)
            {
                $this->client = (new JsonResponse(['a' => 1, 'b' => 2]))->getContent();
                parent::__construct($client);
            }
        };

        $result = $fetchPromoCodeService->getPromoCodeList();

        $this->assertIsArray($result);
    }
}

我需要测试 getPromoCodeList() 方法，所以我想模拟 http 调用。测试的目的是确保我们将结果调用转换为 php 数组。

但我的问题是 FetchPromoCodeService 构造函数。当我执行命令时出现此错误。

ArgumentCountError: Too few arguments to function class@anonymous::__construct(), 0 passed in /var/www/html/tests/Service/FetchPromoCodeServiceTest.php on line 14 and exactly 1 expected

我知道它正在等待 HttpClientInterface 类型的参数，但我知道有一种方法可以覆盖它，因为我只想模拟 client 属性。我只是不记得我是怎么做到的。

如何在 php 和匿名 class 中做到这一点？

Answer 1

@subCore 如果我错了告诉我，但根据你说的，我是这样做的，而且似乎有效。

<?php

namespace App\Tests\Service;

use App\Service\FetchPromoCodeService;
use PHPUnit\Framework\TestCase;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Contracts\HttpClient\HttpClientInterface;

class FetchPromoCodeServiceTest extends TestCase
{
    public function testGetPromoCodeList()
    {
        $client = $this->createMock(HttpClientInterface::class);
        $fetchPromoCodeService = new class ($client) extends FetchPromoCodeService {
            public $client;
            public function __construct($client)
            {
                $codesMock = ['a' => 1, 'b' => 2];
                $this->client = (new JsonResponse($codesMock))->getContent(); // mock client object;
                parent::__construct($client);
            }
        };

        $result = $fetchPromoCodeService->getPromoCodeList();

        $this->assertIsArray($result);
    }
}

Answer 2

尽管您可以使用匿名 class 实现您想要的，但 Symfony HTTP 客户端附带的模拟客户端可能是更简单的解决方案：

<?php

namespace App\Tests\Service;

use App\Service\FetchPromoCodeService;
use PHPUnit\Framework\TestCase;
use Symfony\Component\HttpClient\MockHttpClient;
use Symfony\Component\HttpClient\Response\MockResponse;

final class FetchPromoCodeServiceTest extends TestCase
{
    public function testGetPromoCodeList()
    {
        $client = new MockHttpClient([new MockResponse(json_encode(['a' => 1, 'b' => 2]))]);

        $result = (new FetchPromoCodeService($client))->getPromoCodeList();

        self::assertIsArray($result);
    }
}

使用 PHP 匿名 Class 进行测试和模拟

Test and Mock by Using PHP Anonymous Class

php

phpunit

unit-testing

symfony

php-7