如何使用 laravel 和 phpunit 测试文件上传

I'm trying to run this functional test on my laravel controller. I would like to test image processing, but to do so I want to fake image uploading. How do I do this? I found a few examples online but none seem to work for me. Here's what I have:

public function testResizeMethod()
{
    $this->prepareCleanDB();

    $this->_createAccessableCompany();

    $local_file = __DIR__ . '/test-files/large-avatar.jpg';

    $uploadedFile = new Symfony\Component\HttpFoundation\File\UploadedFile(
        $local_file,
        'large-avatar.jpg',
        'image/jpeg',
        null,
        null,
        true
    );


    $values =  array(
        'company_id' => $this->company->id
    );

    $response = $this->action(
        'POST',
        'FileStorageController@store',
        $values,
        ['file' => $uploadedFile]
    );

    $readable_response = $this->getReadableResponseObject($response);
}

但控制器没有通过这项判断:

elseif (!Input::hasFile('file'))
{
    return Response::error('No file uploaded');
}

So somehow the file isn't passed correctly. How do I go about this?