lithium\tests\cases\storage\CacheTest::testKeyWithClosure PHP Method

    public function testKeyWithClosure()
    {
        $value = 5;
        $key = function () use($value) {
            return "closure key {$value}";
        };
        $result = Cache::key($key);
        $expected = 'closure key 5';
        $this->assertIdentical($expected, $result);
        $reference = 'mutable';
        $key = function () use(&$reference) {
            $reference .= ' key';
            return $reference;
        };
        $result = Cache::key($key);
        $expected = 'mutable key';
        $this->assertIdentical($expected, $result);
        $this->assertIdentical('mutable key', $reference);
    }