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';

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);
}