MockBuilder 在接口中看不到方法答案

【问题标题】：MockBuilder doesn't see method in InterfaceMockBuilder 在接口中看不到方法
【发布时间】：2021-10-27 04:59:55
【问题描述】：

我正在尝试模拟 Throwable 接口，但 MockBuilder 没有看到 getPrevious() 方法。

    $throwableMock = $this->getMockBuilder(\Throwable::class)
        ->disableOriginalConstructor()
        ->getMock();

    $throwableMock->method('getPrevious')
        ->willReturn($domainExceptionMock);

我收到此错误：

Trying to configure method "getPrevious" which cannot be configured because it does not exist, has not been specified, is final, or is static

如果我将 addMethods 添加到模拟生成器，如下所示：

$throwableMock = $this->getMockBuilder(\Throwable::class)
        ->addMethods(['getPrevious'])
        ->disableOriginalConstructor()
        ->getMock();

我收到以下错误：

Trying to set mock method "getPrevious" with addMethods(), but it exists in class "Throwable". Use onlyMethods() for methods that exist in the class

我做错了什么？

【问题讨论】：

标签： php mocking phpunit

【解决方案1】：

我不确定您要对模拟异常做什么，但您可能会发现构建一个真实对象然后抛出它更容易：

class SanityTest extends TestCase
{
    public function testThrowingMock(): void
    {
        $domainExceptionMock = new \RuntimeException('hello');
        $exception = new \Exception('msg', 0, $domainExceptionMock);

        $tst = $this->createMock(Hello::class);  // class Hello {public function hello() {} }
        $tst->method('hello')
            ->willThrowException($exception);

        try {
            $tst->hello();
        } catch (\Exception $e) {
            $this->assertInstanceOf(\RuntimeException::class, $e->getPrevious());
        }
    }
}

模拟一切可能比设置和使用，和/或事后检查真实对象更困难。

【讨论】：

【解决方案2】：

Throwable::getPrevious() 要么是最终的要么是静态的，所以你不能模拟它。

如果您使用 final 方法创建一个类并尝试模拟它，您将收到相同的错误消息。

class Foo {
  final public function say()
  {

  }
}

$throwableMock = $this->getMockBuilder(Foo::class)
                              ->getMock();

$throwableMock->method('say')
              ->willReturn('xxx');

// Trying to configure method "say" which cannot be configured because it does not exist, has not been specified, is final, or is static

所以你应该模拟具体的Exception 类。

【讨论】：