sdk/tests/lib/async/future_constructor_test.dart

// Copyright (c) 2012, 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.

library future_test;

import "package:expect/expect.dart";
import 'dart:async';
import 'dart:isolate';

main() {
  compare(func) {
    // Compare the results of the following two futures.
    Future f1 = new Future(func);
    Future f2 = new Future.value().then((_) => func());
    f2.catchError((_){});  // I'll get the error later.
    f1.then((v1) { f2.then((v2) { Expect.equals(v1, v2); }); },
            onError: (e1) {
              f2.then((_) { Expect.fail("Expected error"); },
                      onError: (e2) {
                         Expect.equals(e1, e2);
                      });
            });
  }
  Future val = new Future.value(42);
  Future err1 = new Future.error("Error")..catchError((_){});
  compare(() => 42);
  compare(() => val);
  compare(() { throw "Flif"; });
  compare(() => err1);
  bool hasExecuted = false;
  compare(() {
    hasExecuted = true;
    return 499;
  });
  Expect.isFalse(hasExecuted);
}