public function testLoadSerializedFileNotExists()
 {
     $file = tempnam(sys_get_temp_dir(), 'PhpPowerpoint_Serialized');
     $oArchive = new \ZipArchive();
     $oArchive->open($file, \ZipArchive::CREATE);
     $oArchive->addFromString('PHPPowerPoint.xml', '');
     $oArchive->close();
     $object = new Serialized();
     $this->assertNull($object->load($file));
 }
 /**
  * @expectedException \Exception
  * @expectedExceptionMessage Invalid file format for PhpOffice\PhpPowerpoint\Reader\Serialized: 
  */
 public function testLoadFileBadFormat()
 {
     $file = PHPPOWERPOINT_TESTS_BASE_DIR . '/resources/files/Sample_01_Simple.pptx';
     $object = new Serialized();
     $object->load($file);
 }