Language/Expressions/Await_Expressions/execution_t03.dart

// Copyright (c) 2015, 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 Evaluation of an await expression a of the form await e proceeds
/// as follows:
/// ...
/// If e raises an exception x, then an instance f of class Future is allocated
/// and later completed with x. Otherwise, if e evaluates to an object o that is
/// not an instance of Future, then let f be the result of calling
/// Future.value() with o as its argument; otherwise let f be the result of
/// evaluating e.
/// Next, execution of the function m immediately enclosing a is suspended
/// until after f completes.
/// @description Check that execution of the function m immediately enclosing a
/// is suspended until after f completes. Test f() async => e; syntax
/// @author sgrekhov@unipro.ru


import 'dart:async';
import '../../../Utils/expect.dart';

Future f1() async => new Future.delayed(new Duration(milliseconds: 50));

Future f2() async => new Future.delayed(new Duration(milliseconds: 100));

Future f3() async => new Future.delayed(new Duration(milliseconds: 10));

test() async {
  List<String> log = [];
  await f1().then((val) { log.add("f1"); });
  await f2().then((val) { log.add("f2"); });
  await f3().then((val) { log.add("f3"); });
  Expect.listEquals(["f1", "f2", "f3"], log);
}

main() {
  asyncStart();
  test().then((value) => asyncEnd());
}