PHP模拟最终类

2vuwiymt  于 2023-01-29  发布在  PHP
关注(0)|答案(9)|浏览(120)

我尝试模拟一个php final class,但由于它被声明为final,我一直收到这个错误:
PHPUnit_Framework_Exception: Class "Doctrine\ORM\Query" is declared "final" and cannot be mocked.
是否有办法在不引入任何新框架的情况下,仅针对我的单元测试来解决这个final行为?

kqhtkvqz

kqhtkvqz1#

既然您提到您不想使用任何其他框架,那么您只剩下一个选择:uopz
uopz是runkit和scary-stuff类型的一个黑魔法扩展,旨在帮助QA基础设施。
uopz_flags是一个可以修改函数、方法和类的标志的函数。

<?php
final class Test {}

/** ZEND_ACC_CLASS is defined as 0, just looks nicer ... **/

uopz_flags(Test::class, null, ZEND_ACC_CLASS);

$reflector = new ReflectionClass(Test::class);

var_dump($reflector->isFinal());
?>

将屈服

bool(false)
aiqt4smr

aiqt4smr2#

对于正在寻找这一特定学说查询模拟答案的人。
您不能模拟Doctrine\ORM\Query,因为它的“final”声明,但是如果您查看Query类代码,那么您将看到它是对AbstractQuery类的扩展,模拟它应该没有任何问题。

/** @var \PHPUnit_Framework_MockObject_MockObject|AbstractQuery $queryMock */
$queryMock = $this
    ->getMockBuilder('Doctrine\ORM\AbstractQuery')
    ->disableOriginalConstructor()
    ->setMethods(['getResult'])
    ->getMockForAbstractClass();
pinkon5k

pinkon5k3#

有一个小型库Bypass Finals正是用于此目的,详细描述见blog post
您只需在加载类之前启用此实用程序:

DG\BypassFinals::enable();
wvt8vs2t

wvt8vs2t4#

我建议您看一看mockery testing framework,它有页面中描述的这种情况的解决方案:Dealing with Final Classes/Methods
您可以通过将您希望模拟的示例化对象传递到\Mockery::mock()来创建代理模拟,即Mockery随后将生成一个真实对象的代理,并选择性地拦截方法调用,以便设置和满足预期。
作为示例,这允许执行类似以下操作:

class MockFinalClassTest extends \PHPUnit_Framework_TestCase {

    public function testMock()
    {
        $em = \Mockery::mock("Doctrine\ORM\EntityManager");

        $query = new Doctrine\ORM\Query($em);
        $proxy = \Mockery::mock($query);
        $this->assertNotNull($proxy);

        $proxy->setMaxResults(4);
        $this->assertEquals(4, $query->getMaxResults());
    }

我不知道你需要做什么,但我希望这能帮上忙

juzqafwq

juzqafwq5#

当您想要模拟最后一个类时,现在正是使用Dependency inversion principle的最佳时机:
我们应该依靠抽象,而不是具体。
对于嘲笑它的意思是:创建一个抽象(接口或抽象类)并将其分配给最终类,然后模拟该抽象。

k75qkfdt

k75qkfdt6#

PHPUnit的2019年答案

我看到你用的是PHPUnit,你可以用bypass finals from this answer
设置只比bootstrap.php多一点。阅读How to Mock Final Classes in PHPUnit中的“为什么”。
下面是“怎么样”↓

2步

您需要使用Hook和旁路调用:

<?php declare(strict_types=1);

use DG\BypassFinals;
use PHPUnit\Runner\BeforeTestHook;

final class BypassFinalHook implements BeforeTestHook
{
    public function executeBeforeTest(string $test): void
    {
        BypassFinals::enable();
    }
}

更新phpunit.xml

<phpunit bootstrap="vendor/autoload.php">
    <extensions>
        <extension class="Hook\BypassFinalHook"/>
    </extensions>
</phpunit>

然后你可以模拟任何最终类

cbeh67ev

cbeh67ev7#

我在Doctrine\ORM\Query上偶然发现了同样的问题,我需要对下面的代码进行单元测试:

public function someFunction()
{
    // EntityManager was injected in the class 
    $query = $this->entityManager
        ->createQuery('SELECT t FROM Test t')
        ->setMaxResults(1);

    $result = $query->getOneOrNullResult();

    ...

}

createQuery返回Doctrine\ORM\Query对象。我不能用Doctrine\ORM\AbstractQuery来模拟,因为它没有setMaxResults方法,而且我不想引入任何其他框架。为了克服final对类的限制,我在PHP 7中使用了anonymous classes,它非常容易创建。在我的测试用例类中,我有:

private function getMockDoctrineQuery($result)
{
    $query = new class($result) extends AbstractQuery {

        private $result;

        /**
         * Overriding original constructor.
         */
        public function __construct($result)
        {
            $this->result = $result;
        }

        /**
         * Overriding setMaxResults
         */
        public function setMaxResults($maxResults)
        {
            return $this;
        }

        /**
         * Overriding getOneOrNullResult
         */
        public function getOneOrNullResult($hydrationMode = null)
        {
            return $this->result;
        }

        /**
         * Defining blank abstract method to fulfill AbstractQuery 
         */ 
        public function getSQL(){}

        /**
         * Defining blank abstract method to fulfill AbstractQuery
         */ 
        protected function _doExecute(){}
    };

    return $query;
}

在我的测试中:

public function testSomeFunction()
{
    // Mocking doctrine Query object
    $result = new \stdClass;
    $mockQuery = $this->getMockQuery($result);

    // Mocking EntityManager
    $entityManager = $this->getMockBuilder(EntityManagerInterface::class)->getMock();
    $entityManager->method('createQuery')->willReturn($mockQuery);

    ...

}
jaxagkaj

jaxagkaj8#

搞笑方式:)
PHP7.1、PHP5.7单元

<?php
use Doctrine\ORM\Query;

//...

$originalQuery      = new Query($em);
$allOriginalMethods = get_class_methods($originalQuery);

// some "unmockable" methods will be skipped
$skipMethods = [
    '__construct',
    'staticProxyConstructor',
    '__get',
    '__set',
    '__isset',
    '__unset',
    '__clone',
    '__sleep',
    '__wakeup',
    'setProxyInitializer',
    'getProxyInitializer',
    'initializeProxy',
    'isProxyInitialized',
    'getWrappedValueHolderValue',
    'create',
];

// list of all methods of Query object
$originalMethods = [];
foreach ($allOriginalMethods as $method) {
    if (!in_array($method, $skipMethods)) {
        $originalMethods[] = $method;
    }
}

// Very dummy mock
$queryMock = $this
    ->getMockBuilder(\stdClass::class)
    ->setMethods($originalMethods)
    ->getMock()
;

foreach ($originalMethods as $method) {

    // skip "unmockable"
    if (in_array($method, $skipMethods)) {
        continue;
    }

    // mock methods you need to be mocked
    if ('getResult' == $method) {
        $queryMock->expects($this->any())
            ->method($method)
            ->will($this->returnCallback(
                function (...$args) {
                    return [];
                }
            )
        );
        continue;
    }

    // make proxy call to rest of the methods
    $queryMock->expects($this->any())
        ->method($method)
        ->will($this->returnCallback(
            function (...$args) use ($originalQuery, $method, $queryMock) {
                $ret = call_user_func_array([$originalQuery, $method], $args);

                // mocking "return $this;" from inside $originalQuery
                if (is_object($ret) && get_class($ret) == get_class($originalQuery)) {
                    if (spl_object_hash($originalQuery) == spl_object_hash($ret)) {
                        return $queryMock;
                    }

                    throw new \Exception(
                        sprintf(
                            'Object [%s] of class [%s] returned clone of itself from method [%s]. Not supported.',
                            spl_object_hash($originalQuery),
                            get_class($originalQuery),
                            $method
                        )
                    );
                }

                return $ret;
            }
        ))
    ;
}

return $queryMock;
zkure5ic

zkure5ic9#

我已经实现了@Vadym方法并更新了它。现在我成功地使用它进行了测试!

protected function getFinalMock($originalObject)
{
    if (gettype($originalObject) !== 'object') {
        throw new \Exception('Argument must be an object');
    }

    $allOriginalMethods = get_class_methods($originalObject);

    // some "unmockable" methods will be skipped
    $skipMethods = [
        '__construct',
        'staticProxyConstructor',
        '__get',
        '__set',
        '__isset',
        '__unset',
        '__clone',
        '__sleep',
        '__wakeup',
        'setProxyInitializer',
        'getProxyInitializer',
        'initializeProxy',
        'isProxyInitialized',
        'getWrappedValueHolderValue',
        'create',
    ];

    // list of all methods of Query object
    $originalMethods = [];
    foreach ($allOriginalMethods as $method) {
        if (!in_array($method, $skipMethods)) {
            $originalMethods[] = $method;
        }
    }

    $reflection = new \ReflectionClass($originalObject);
    $parentClass = $reflection->getParentClass()->name;

    // Very dummy mock
    $mock = $this
        ->getMockBuilder($parentClass)
        ->disableOriginalConstructor()
        ->setMethods($originalMethods)
        ->getMock();

    foreach ($originalMethods as $method) {

        // skip "unmockable"
        if (in_array($method, $skipMethods)) {
            continue;
        }

        // make proxy call to rest of the methods
        $mock
            ->expects($this->any())
            ->method($method)
            ->will($this->returnCallback(
                function (...$args) use ($originalObject, $method, $mock) {
                    $ret = call_user_func_array([$originalObject, $method], $args);

                    // mocking "return $this;" from inside $originalQuery
                    if (is_object($ret) && get_class($ret) == get_class($originalObject)) {
                        if (spl_object_hash($originalObject) == spl_object_hash($ret)) {
                            return $mock;
                        }

                        throw new \Exception(
                            sprintf(
                                'Object [%s] of class [%s] returned clone of itself from method [%s]. Not supported.',
                                spl_object_hash($originalObject),
                                get_class($originalObject),
                                $method
                            )
                        );
                    }

                    return $ret;
                }
            ));
    }

    return $mock;
}

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