assertEquals(WebSocketServerExtension.RSV1, extension.rsv());
assertTrue(extension.newExtensionDecoder() instanceof PerMessageDeflateDecoder);
assertTrue(extension.newExtensionEncoder() instanceof PerMessageDeflateEncoder);
// execute
data = extension.newReponseData();
// test
assertEquals(PERMESSAGE_DEFLATE_EXTENSION, data.name());
assertEquals(2, data.parameters().size());
assertTrue(data.parameters().containsKey(SERVER_MAX_WINDOW));