Composer php phpunit错误：类'；预言家'；找不到

我正在用以下代码编写一些预言中的PHPUnit测试：

public function testItBuildsAndPersistsEnclosure()
{
   $em = $this->prophesize(EntityManagerInterface::class);
}

这将产生以下输出：

PHPUnit 6.5.14由塞巴斯蒂安·伯格曼和贡献者撰写

测试项目测试套件E.
2/2（100%）

时间：105毫秒，内存：6.00MB

有1个错误：

(一) Tests\AppBundle\Service\EnclosureBuilderServiceProphecTest:：TestBuildAndPersistsenClosure 错误：未找到类“Prophecy\Prophet”

一般来说，我对PHPUnit和测试有点陌生，但据我所知，PHPUnit应该具有使用预言的能力，这使得上面的错误非常令人惊讶

我尝试安装，但该过程失败，如下所示：

composer require phpspec/prophecy

Using version ^1.10 for phpspec/prophecy
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: don't install phpunit/phpunit 9.0.1
    - Conclusion: remove doctrine/instantiator 1.1.0
    - Installation request for phpunit/phpunit ^9.0 -> satisfiable by phpunit/phpunit[9.0.0, 9.0.1].
    - Conclusion: don't install doctrine/instantiator 1.1.0
    - phpunit/phpunit 9.0.0 requires doctrine/instantiator ^1.2.0 -> satisfiable by doctrine/instantiator[1.2.0, 1.3.0].
    - Can only install one of: doctrine/instantiator[1.2.0, 1.1.0].
    - Can only install one of: doctrine/instantiator[1.3.0, 1.1.0].
    - Installation request for doctrine/instantiator (locked at 1.1.0) -> satisfiable by doctrine/instantiator[1.1.0].


Installation failed, reverting ./composer.json to its original content.

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当控制台输出列出v6.5.14时，为什么要在v9.0中安装PHPUnit over Composer？你确定给定的测试行（没有实例化Prophet）会触发该错误吗？@NicoHaase:是的，我非常确定Prophet是导致该错误的原因。我可以问你为什么不升级你的条令/实例化器吗？