PhpOffice\PhpPresentation\PresentationProperties::markAsFinal PHP Метод

    public function markAsFinal($state = true)
    {
        if (is_bool($state)) {
            $this->markAsFinal = $state;
        }
        return $this;
    }

 public function testMarkAsFinal()
 {
     $object = new PresentationProperties();
     $this->assertFalse($object->isMarkedAsFinal());
     $this->assertInstanceOf('PhpOffice\\PhpPresentation\\PresentationProperties', $object->markAsFinal('AAAA'));
     $this->assertFalse($object->isMarkedAsFinal());
     $this->assertInstanceOf('PhpOffice\\PhpPresentation\\PresentationProperties', $object->markAsFinal(true));
     $this->assertTrue($object->isMarkedAsFinal());
     $this->assertInstanceOf('PhpOffice\\PhpPresentation\\PresentationProperties', $object->markAsFinal(false));
     $this->assertFalse($object->isMarkedAsFinal());
     $this->assertInstanceOf('PhpOffice\\PhpPresentation\\PresentationProperties', $object->markAsFinal());
     $this->assertTrue($object->isMarkedAsFinal());
 }