### Question:
SerializerFactoryLoader { public static SerializerFactory getFactory(ProcessingEnvironment processingEnv) { return new SerializerFactoryImpl(loadExtensions(processingEnv), processingEnv); } private  SerializerFactoryLoader(); static SerializerFactory getFactory(ProcessingEnvironment processingEnv);  }### Answer:
@Test public void getFactory_extensionsLoaded() throws Exception { SerializerFactory factory = SerializerFactoryLoader.getFactory(mockProcessingEnvironment); Serializer actualSerializer = factory.getSerializer(typeMirrorOf(String.class)); assertThat(actualSerializer.getClass().getName()) .contains("TestStringSerializerFactory$TestStringSerializer"); }