使用Promise时的Php单元测试

我使用AWS SDK的Promise将许多文件保存到S3 bucket中。我无法为此构建单元测试

我的职能

function save($item, array $layers)
{
    $promises = [];
    foreach ($layers as $key => $layer) {
        $filename = $this->getS3Filename($item, $key);
        $promise = $this->s3Client->uploadAsync(
        );
        $promise = $promise->then(
            function () {
            },
            function ($reason) use ($item) {
                $this->logger->error("The promise to store file on S3 was rejected with {$reason} for item {$item->getId()}");
            }
        );
        $promises[] = $promise;
    }
    all($promises)->wait();
}

我得到以下错误：

GuzzleHttp\Promise\RejectionException:承诺已被拒绝 原因：调用等待回调无法解析承诺 /Users/sela/PhpstormProjects/ziggy/vendor/guzzlehttp/promises/src/functions.php:112 /Users/sela/PhpstormProjects/ziggy/vendor/guzzlehttp/promises/src/Promise.php:75

运行my

phpunit时

以下是我的单元测试代码：

protected function setUp()
{
    $this->logger = $this->createMock(LoggerInterface::class);

    parent::setUp();
}

public function testSaveBatch()
{
    $this->logger
        ->expects($this->once())
        ->method('error');
    $this->s3Client = $this->getMockBuilder(S3ClientInterface::class)
        ->setMethods(['uploadAsync'])
        ->disableOriginalConstructor()
        ->getMockForAbstractClass();
    $promise = $this->createMock(PromiseInterface::class);
    $promise
        ->expects($this->once())
        ->method('then')
        ->will($this->returnCallback([$this, 'promiseCallback']));

    $this->s3Client
        ->expects($this->once())
        ->method('uploadAsync')
        ->willReturn(
            $promise
        );

    $object = new Object(
    );
    $layers = ['123' => ''];
    $object->save($item, $layers);
}

/**
 * @return null|MockObject
 */
public function promiseCallback()
{
    $promise = $this->createMock(PromiseInterface::class);

    $fulfilledPromise = $this->createMock(FulfilledPromise::class);
    $fulfilledPromise
        ->expects($this->once())
        ->method('resolve')
        ->will($this->returnCallback($promise))
    ;

    return $fulfilledPromise;

}