public function testRemoveTransformerFactory()
 {
     $factory = new TransformerFactory();
     $registry = new TransformerFactoriesRegistry([$factory]);
     $this->assertCount(1, $registry->getTransformerFactories());
     $registry->removeTransformerFactory($factory);
     $this->assertCount(0, $registry->getTransformerFactories());
 }
 /**
  * Check if transformer factory of particular language exists
  *
  * @param Language $language
  *
  * @return bool
  */
 private function isTransformerFactoryExists(Language $language)
 {
     return $this->transformerFactoriesRegistry->getTransformerFactories()->offsetExists($language->getIdentifier());
 }