mageekguy\atoum\asserters\output::setWith PHP Method

    public function setWith($value = null, $charlist = null, $checkType = true)
    {
        if ($value instanceof \closure) {
            ob_start();
            $value($this->getTest());
            $value = ob_get_clean();
        } else {
            if ($value === null && ob_get_level() > 0) {
                $value = ob_get_clean();
                ob_start();
            }
        }
        return parent::setWith($value, $charlist, $checkType);
    }

 public function testSetWith()
 {
     $this->if($asserter = new sut(new asserter\generator()))->then->object($asserter->setWith(function () use(&$output) {
         echo $output = uniqid();
     }))->isIdenticalTo($asserter)->string($asserter->getValue())->isEqualTo($output)->variable($asserter->getCharlist())->isNull()->object($asserter->setWith(function () use(&$output) {
         echo $output = uniqid();
     }, null, ""))->isIdenticalTo($asserter)->string($asserter->getValue())->isEqualTo($output)->string($asserter->getCharlist())->isEqualTo("");
 }