addDumper example

class TranslationWriterTest extends TestCase
{
    public function testWrite()
    {
        $dumper = $this->createMock(DumperInterface::class);
        $dumper
            ->expects($this->once())
            ->method('dump');

        $writer = new TranslationWriter();
        $writer->addDumper('test', $dumper);
        $writer->write(new MessageCatalogue('en'), 'test');
    }
}

        $command = $this->createCommand($provider, $locales, $domains, $defaultLocale);
        $application = new Application();
        $application->add($command);

        return new CommandTester($application->find('translation:pull'));
    }

    private function createCommand(ProviderInterface $provider, array $locales = ['en'], array $domains = ['messages'], $defaultLocale = 'en', array $providerNames = ['loco']): TranslationPullCommand
    {
        $writer = new TranslationWriter();
        $writer->addDumper('xlf', new XliffFileDumper());
        $writer->addDumper('yml', new YamlFileDumper());

        $reader = new TranslationReader();
        $reader->addLoader('xlf', new XliffFileLoader());
        $reader->addLoader('yml', new YamlFileLoader());

        return new TranslationPullCommand(
            $this->getProviderCollection($provider, $providerNames, $locales, $domains),
            $writer,
            $reader,
            $defaultLocale,
            [