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publicでないメソッドをクラス外から実行する

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PHPはReflectionMethodを使うと、publicでないメソッドをクラス外から実行できるようになります。
protectedやprivateメソッドのテストコードを書きたいときに使えます。

次のsampleMethodのユニットテストを書く例です。

SampleClass.php
namespace SampleNamespace;

class SampleClass {
    private function sampleMethod() {
        return true;
    }
}

ReflectionMethodのコンストラクタ引数で対象クラスとメソッドを指定。
setAccessible(true)でアクセス可能になり、invokeで実行できます。

SampleClassTest.php
require_once('SampleClass.php');

class SampleClassTest extends PHPUnit_Framework_TestCase {

    public function test_sample() {
        $sample = new \SampleNamespace\SampleClass();
        $reflection_method = new ReflectionMethod('SampleNamespace\SampleClass', 'sampleMethod');
        $reflection_method->setAccessible(true);
        $this->assertTrue($reflection_method->invoke($sample));
    }
}

setAccessibleメソッドのドキュメントが参考になりました。
http://jp.php.net/manual/ja/reflectionmethod.setaccessible.php

pakiln
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