locale_translation_download_source example

    $this->setTranslationFiles();
    vfsStream::create([
      'contrib_module_one-8.x-1.1.de._po' => '__old_content__',
    ], $this->translationsStream);

    $url = \Drupal::service('url_generator')->generateFromRoute('<front>', [], ['absolute' => TRUE]);
    $uri = $url . PublicStream::basePath() . '/remote/all/contrib_module_one/contrib_module_one-8.x-1.1.de._po';
    $source_file = (object) [
      'uri' => $uri,
    ];

    $result = locale_translation_download_source($source_file, 'translations://');

    $this->assertEquals('translations://contrib_module_one-8.x-1.1.de._po', $result->uri);
    $this->assertFileDoesNotExist('translations://contrib_module_one-8.x-1.1.de_0._po');
    $this->assertFileExists('translations://contrib_module_one-8.x-1.1.de._po');
    $this->assertStringNotContainsString('__old_content__', file_get_contents('translations://contrib_module_one-8.x-1.1.de._po'));
  }

}