xdebug/blog/vendor/hamcrest/hamcrest-php/tests/Hamcrest/FeatureMatcherTest.php

<?php
namespace Hamcrest;

class Thingy
{
    private $_result;
    public function __construct($result)
    {
        $this->_result = $result;
    }
    public function getResult()
    {
        return $this->_result;
    }
}

/* Test-specific subclass only */
class ResultMatcher extends \Hamcrest\FeatureMatcher
{
    public function __construct()
    {
        parent::__construct(self::TYPE_ANY, null, equalTo('bar'), 'Thingy with result', 'result');
    }
    public function featureValueOf($actual)
    {
        if ($actual instanceof \Hamcrest\Thingy) {
            return $actual->getResult();
        }
    }
}

class FeatureMatcherTest extends \Hamcrest\AbstractMatcherTest
{

    private $_resultMatcher;

    public function setUp()
    {
        $this->_resultMatcher = $this->_resultMatcher();
    }

    protected function createMatcher()
    {
        return $this->_resultMatcher();
    }

    public function testMatchesPartOfAnObject()
    {
        $this->assertMatches($this->_resultMatcher, new \Hamcrest\Thingy('bar'), 'feature');
        $this->assertDescription('Thingy with result "bar"', $this->_resultMatcher);
    }

    public function testMismatchesPartOfAnObject()
    {
        $this->assertMismatchDescription(
            'result was "foo"',
            $this->_resultMatcher,
            new \Hamcrest\Thingy('foo')
        );
    }

    public function testDoesNotGenerateNoticesForNull()
    {
        $this->assertMismatchDescription('result was null', $this->_resultMatcher, null);
    }

    // -- Creation Methods

    private function _resultMatcher()
    {
        return new \Hamcrest\ResultMatcher();
    }
}