Наследование: implements Neos\Flow\I18n\Formatter\FormatterInterface
 /**
  * @test
  */
 public function formatResolverWorksCorrectlyForFullyQualifiedFormatterClassNames()
 {
     $actualFormatter = new Fixtures\SampleFormatter();
     $locale = new I18n\Locale('de');
     $testResult = $this->formatResolver->resolvePlaceholders(sprintf('{0,%s}', Fixtures\SampleFormatter::class), ['foo'], $locale);
     $this->assertEquals($actualFormatter->format('foo', $locale), $testResult);
 }