使用Symfony的flashBag会话进行单元测试

运行单元测试对常规会话处理程序工作正常：

$app->register(new SilexProviderSessionServiceProvider(),array(
    'session.storage.options' => array(
        'cookie_lifetime' => 1209600,// 2 weeks
    ),));

并在我的单元测试中设置此标志：

$this->app['session.test'] = true;

如果我没有设置session.test标志,我的单元测试会抛出已发送的标头错误并且全部失败.有了它,我的测试运行良好.

问题是我试图使用flashBag功能(会话信息只持续到第一个请求然后被删除)：

$foo = $app['session']->getFlashBag()->all();

flashBag似乎不尊重session.test标志,并尝试发送标头,导致我的所有单元测试失败：

24)
YumiliciousUnitTestsValidatorPersonAccountTest::setConstraintsPassesWithMinimumAttributes
RuntimeException: Failed to start the session because headers have
already been sent.

/webroot/yumilicious/vendor/symfony/http-foundation/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php:142
/webroot/yumilicious/vendor/symfony/http-foundation/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php:262
/webroot/yumilicious/vendor/symfony/http-foundation/Symfony/Component/HttpFoundation/Session/Session.php:240
/webroot/yumilicious/vendor/symfony/http-foundation/Symfony/Component/HttpFoundation/Session/Session.php:250
/webroot/yumilicious/src/app.php:38
/webroot/yumilicious/tests/Yumilicious/UnitTests/Base.php:13
/webroot/yumilicious/vendor/silex/silex/src/Silex/WebTestCase.php:34
/webroot/yumilicious/vendor/EHER/PHPUnit/src/phpunit/phpunit.php:46
/webroot/yumilicious/vendor/EHER/PHPUnit/bin/phpunit:5

我把它缩小到这段代码：https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php#L259

具体来说,第262行.注释掉单行允许我的测试正常工作并且全部通过绿色.

我已经搜索了很多以使其工作,但我没有运气.我认为这是因为flashBag的内容是新的(https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpFoundation/Session/Session.php#L305)并且旧方法已被弃用.

让我的单元测试工作的任何建议都很棒.