Opis\Colibri\Test\CommonTest::testClosureSerializationTwice PHP Method

    public function testClosureSerializationTwice()
    {
        $a = function ($p) {
            return $p;
        };
        $b = function ($p) use($a) {
            return $a($p);
        };
        $u = $this->s($this->s($b));
        $this->assertEquals('ok', $u('ok'));
    }