PHPUnit“不存在模拟方法".使用$ mock-> expects($ this-> at(...))时 [英] PHPUnit "Mocked method does not exist." when using $mock->expects($this->at(...))

问题描述

PHPUnit模拟对象遇到了一个奇怪的问题.我有一个应该被调用两次的方法，所以我正在使用"at"匹配器.第一次调用该方法有效，但是由于某种原因，第二次调用该方法，我得到模拟方法不存在".我以前使用过匹配"匹配器，但从未遇到过.

I've run into a strange issue with PHPUnit mock objects. I have a method that should be called twice, so I'm using the "at" matcher. This works for the first time the method is called, but for some reason, the second time it's called, I get "Mocked method does not exist.". I've used the "at" matcher before and have never run into this.

我的代码如下:

class MyTest extends PHPUnit_Framework_TestCase
{
    ...

    public function testThis()
    {
        $mock = $this->getMock('MyClass', array('exists', 'another_method', '...'));
        $mock->expects($this->at(0))
             ->method('exists')
             ->with($this->equalTo('foo'))
             ->will($this->returnValue(true));

        $mock->expects($this->at(1))
             ->method('exists')
             ->with($this->equalTo('bar'))
             ->will($this->returnValue(false));
    }

    ...
}

运行测试时，我得到:

Expectation failed for method name is equal to <string:exists> when invoked at sequence index 1.
Mocked method does not exist.

如果我删除第二个匹配器，则不会收到错误消息.

If I remove the second matcher, I do not get the error.

以前有人遇到过吗?

谢谢！

推荐答案

问题最终在于我如何理解"at"匹配器的工作原理.另外，我的示例并非逐字逐句地反映在单元测试中.我以为"at"匹配器计数器基于每个查询工作，而它实际上基于每个对象实例工作.

The issue ended up being with how I understood the "at" matcher to work. Also, my example was not verbatim how it is in my unit test. I thought the "at" matcher counter worked on a per query basis, where it really works on a per object instance basis.

示例:

class MyClass {

    public function exists($foo) {
        return false;
    }

    public function find($foo) {
        return $foo;
    }
}

不正确:

class MyTest extends PHPUnit_Framework_TestCase
{

    public function testThis()
    {
        $mock = $this->getMock('MyClass');
        $mock->expects($this->at(0))
             ->method('exists')
             ->with($this->equalTo('foo'))
             ->will($this->returnValue(true));

        $mock->expects($this->at(0))
             ->method('find')
             ->with($this->equalTo('foo'))
             ->will($this->returnValue('foo'));

        $mock->expects($this->at(1))
             ->method('exists')
             ->with($this->equalTo('bar'))
             ->will($this->returnValue(false));

        $this->assertTrue($mock->exists("foo"));
        $this->assertEquals('foo', $mock->find('foo'));
        $this->assertFalse($mock->exists("bar"));
    }

}

正确:

class MyTest extends PHPUnit_Framework_TestCase
{

    public function testThis()
    {
        $mock = $this->getMock('MyClass');
        $mock->expects($this->at(0))
             ->method('exists')
             ->with($this->equalTo('foo'))
             ->will($this->returnValue(true));

        $mock->expects($this->at(1))
             ->method('find')
             ->with($this->equalTo('foo'))
             ->will($this->returnValue('foo'));

        $mock->expects($this->at(2))
             ->method('exists')
             ->with($this->equalTo('bar'))
             ->will($this->returnValue(false));

        $this->assertTrue($mock->exists("foo"));
        $this->assertEquals('foo', $mock->find('foo'));
        $this->assertFalse($mock->exists("bar"));
    }

}

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