### Question:
LambdaServer implements HttpServer { @Override public HttpServer connectionHandler(Handler<HttpConnection> handler) { return this; } LambdaServer(Vertx vertx, Context context, InputStream input, OutputStream output); @Override boolean isMetricsEnabled(); @Override ReadStream<HttpServerRequest> requestStream(); @Override HttpServer requestHandler(Handler<HttpServerRequest> handler); @Override Handler<HttpServerRequest> requestHandler(); @Override HttpServer connectionHandler(Handler<HttpConnection> handler); @Override ReadStream<ServerWebSocket> websocketStream(); @Override HttpServer websocketHandler(Handler<ServerWebSocket> handler); @Override Handler<ServerWebSocket> websocketHandler(); @Override HttpServer listen(); @Override HttpServer listen(int port, String host); @Override HttpServer listen(int port, String host, Handler<AsyncResult<HttpServer>> listenHandler); @Override HttpServer listen(int port); @Override HttpServer listen(int port, Handler<AsyncResult<HttpServer>> listenHandler); @Override HttpServer listen(Handler<AsyncResult<HttpServer>> listenHandler); @Override void close(); @Override void close(Handler<AsyncResult<Void>> completionHandler); @Override int actualPort();  }### Answer:
@Test public void testConnectionHandler(TestContext context) { context.assertEquals(server, server.connectionHandler(null)); }