public void testMessageBodyWritersMediaTypes() {
ProvidersRegistry providers = createProvidersRegistryImpl();
ByteArrayProvider byteArrayProvider = new ByteArrayProvider();
InputStreamProvider inputStreamProvider = new InputStreamProvider();
StringProvider stringProvider = new StringProvider();
String2Provider string2Provider = new String2Provider();
FileProvider fileProvider = new FileProvider();
IntegerMessageBodyProvider objectMessageBodyProvider = new IntegerMessageBodyProvider();
providers.addProvider(byteArrayProvider);