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Edit File: IsInstanceOfTest.php

<?php
namespace Hamcrest\Core;

class IsInstanceOfTest extends \Hamcrest\AbstractMatcherTest
{

private $_baseClassInstance;
    private $_subClassInstance;

protected function setUp()
    {
        $this->_baseClassInstance = new \Hamcrest\Core\SampleBaseClass('good');
        $this->_subClassInstance = new \Hamcrest\Core\SampleSubClass('good');
    }

protected function createMatcher()
    {
        return \Hamcrest\Core\IsInstanceOf::anInstanceOf('stdClass');
    }

public function testEvaluatesToTrueIfArgumentIsInstanceOfASpecificClass()
    {
        assertThat($this->_baseClassInstance, anInstanceOf('Hamcrest\Core\SampleBaseClass'));
        assertThat($this->_subClassInstance, anInstanceOf('Hamcrest\Core\SampleSubClass'));
        assertThat(null, not(anInstanceOf('Hamcrest\Core\SampleBaseClass')));
        assertThat(new \stdClass(), not(anInstanceOf('Hamcrest\Core\SampleBaseClass')));
    }

public function testEvaluatesToFalseIfArgumentIsNotAnObject()
    {
        assertThat(null, not(anInstanceOf('Hamcrest\Core\SampleBaseClass')));
        assertThat(false, not(anInstanceOf('Hamcrest\Core\SampleBaseClass')));
        assertThat(5, not(anInstanceOf('Hamcrest\Core\SampleBaseClass')));
        assertThat('foo', not(anInstanceOf('Hamcrest\Core\SampleBaseClass')));
        assertThat(array(1, 2, 3), not(anInstanceOf('Hamcrest\Core\SampleBaseClass')));
    }

public function testHasAReadableDescription()
    {
        $this->assertDescription('an instance of stdClass', anInstanceOf('stdClass'));
    }

public function testDecribesActualClassInMismatchMessage()
    {
        $this->assertMismatchDescription(
            '[Hamcrest\Core\SampleBaseClass] <good>',
            anInstanceOf('Hamcrest\Core\SampleSubClass'),
            $this->_baseClassInstance
        );
    }
}

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