php - 无法进行单元测试 : $_SESSION empties before each test is ran

Question

我无法对我的代码进行单元测试。

$_SESSION 每次运行下一个测试时都会清除。当我运行 testStartProductSession() 时，我的对象将一些数据添加到 $_SESSION 变量。但是当我运行下一个测试方法( testSessionIdIsKept() )时 $_SESSION 再次为空。

看起来 $_SESSION 在单元测试时变成局部变量。

我不知道还能做什么。请检查以下输出:

// session_start() on bootrap.php;

class MC_Session_ProductTest extends PHPUnit_Framework_TestCase
{

    /**
     * @return MC_Session_Product
     */
    public function getObject()
    {
        // make getInstance() return new instance instead of singleton instance
        MC_Session_Product::$isUnityTest = true;
        $object = MC_Session_Product::getInstance();
        $object->getWsClient()->setServerListUrl(SERVER_LIST_URL);
        return $object;
    }

    /**
     * All tests pass
     * @depends testSetParam
     */
    public function testStartProductSession()
    {
        $developerId = PARAM_DEVELOPER_ID;
        $productCode = PARAM_PRODUCT_CODE;
        $productVersion = PARAM_PRODUCT_VERSION;
        $platform = PARAM_PLATAFORM;
        $deviceType = PARAM_DEVICE_TYPE;
        $locale = PARAM_LOCALE;

        try {
            $object = $this->getObject();
            $object->startSession($developerId, $productCode, $productVersion,
                                  $platform, $deviceType, $locale);
            $this->assertTrue($object->sessionStarted());
        } catch (Exception $e) {
            $this->fail('Fail to start session: ' . $object->getLastUrl());
        }

        echo "\$_SESSION in testStartProductSession(): ", print_r($_SESSION, 1);
        return $object;
    }

    /**
     * Test fails because $_SESSION is empty again
     * @depends testStartProductSession
     */
    public function testSessionIdIsKept(MC_Session_Product $lastObject)
    {
        echo "\$_SESSION in testSessionIdIsKept(): ", print_r($_SESSION, 1);
        $object = $this->getObject();
        // fails
        $this->assertTrue($lastObject->sessionStarted());
        $this->assertTrue($object->sessionStarted());
        $this->assertEquals($lastObject->getSessionId(), $object->getSessionId());
        return $object;
    }
}

/* ###### Output


$_SESSION in testStartProductSession():
Array
(
    [__MC] => Array
        (
            [MC_Session_Product] => Array
                (
                    [keyOne] => 'valueOne'
                    [sessionId] => 'someId'
                )

        )

)
$_SESSION in testSessionIdIsKept():
Array
(
)

*/

Answer 1

与其让 $_SESSION 成为单元测试的依赖项，不如对每个函数需要的 session 部分进行参数化。然后您可以轻松地模拟单元测试中的参数。以您当前尝试的方式执行此操作太困难，并且会使您的代码更难测试。这将需要更改您当前的代码，但它会改进您的代码并使事情更易于测试。