PoStreamWriter example

  protected $poFile;

  /** * {@inheritdoc} */
  protected function setUp(): void {
    parent::setUp();

    $poHeader = $this->prophesize(PoHeader::class);
    $poHeader->__toString()->willReturn('');
    $this->poWriter = new PoStreamWriter();
    $this->poWriter->setHeader($poHeader->reveal());

    $root = vfsStream::setup();
    $this->poFile = new vfsStreamFile('powriter.po');
    $root->addChild($this->poFile);
  }

  /** * @covers ::getURI */
  public function testGetUriException() {
    

// Template required.       $filename = 'drupal.pot';
    }

    $item = $reader->readItem();
    if (!empty($item)) {
      $uri = $this->fileSystem->tempnam('temporary://', 'po_');
      $header = $reader->getHeader();
      $header->setProjectName($this->config('system.site')->get('name'));
      $header->setLanguageName($language_name);

      $writer = new PoStreamWriter();
      $writer->setURI($uri);
      $writer->setHeader($header);

      $writer->open();
      $writer->writeItem($item);
      $writer->writeItems($reader);
      $writer->close();

      $response = new BinaryFileResponse($uri);
      $response->setContentDisposition('attachment', $filename);
      $form_state->setResponse($response);
    }