public function testUpdateCells()
 {
     $file = $this->createTestFile();
     $fileRes = $this->restApi->insertFile($file);
     $sheets = $this->restApi->getWorksheets($fileRes['id']);
     $sheet = array_shift($sheets);
     $file->setGoogleId($fileRes['id']);
     $file->setSheetId($sheet['wsid']);
     $file->setPathname($this->test3CsvPath);
     // update sheet size
     $this->restApi->updateWorksheet($file);
     $errors = $this->restApi->updateCells($file);
     $this->assertEmpty($errors['errors']);
     // cleanup
     $this->restApi->deleteFile($file);
 }