blob: 93aa3eadde2d0942a59a41df40ed9587d2bcc761 [file] [log] [blame]
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// @assertion Future<bool> isEmpty
/// Reports whether this stream contains any elements.
/// Stops listening to the stream after the first element has been received.
/// Internally the method cancels its subscription after the first element.
/// This means that single-subscription (non-broadcast) streams are closed and
/// cannot be reused after a call to this getter.
/// @description Checks that the [isEmpty] returns the Future<bool>.
/// @author
import "dart:async";
import "dart:io";
import "../../../Utils/expect.dart";
main() {
HttpServer.bind("", 0).then((server) {
server.listen((request) {
.then((websocket) {
var v = websocket.isEmpty;
Expect.isTrue(v is Future<bool>);
var webs = WebSocket.connect("ws://${server.port}/");
webs.then((client) {
bool called = false;
client.isEmpty.then((value) {
called = true;
client.close().then((_) async {
await server.close();