PhpOffice\PhpPresentation\Shape\Drawing\ZipFile::getExtension PHP Метод

    public function getExtension()
    {
        return pathinfo($this->getZipFileIn(), PATHINFO_EXTENSION);
    }

 public function testExtension()
 {
     $oDrawing = new ZipFile();
     $oDrawing->setPath($this->fileOk);
     $this->assertEquals('gif', $oDrawing->getExtension());
 }