LibTest/async/Future/then_A01_t02.dart

// Copyright (c) 2011, 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 then(dynamic onValue(T value), {Function onError})
 *    Register callbacks to be called when this future completes.
 *    When this future completes with a value, the onValue callback will be
 * called with that value. If this future is already completed, the callback
 * will not be called immediately, but will be scheduled in a later microtask.
 * . . .
 *    Returns a new Future which is completed with the result of the call to
 * onValue (if this future completes with a value) or to onError (if this
 * future completes with an error).
 * @description Checks that the correct value is passes to [onValue].
 * @author msyabro
 */
import "dart:async";
import "../../../Utils/expect.dart";

class C {
  const C();
}

void check(Object value) {
  Completer completer = new Completer();
  Future f = completer.future;
  f.then((fValue) {
    Expect.identical(value, fValue);
    asyncEnd();
  });

  asyncStart();
  completer.complete(value);
}

main() {
  check(1e98);
  check('value');
  check(true);
  check(const {});
  check(const  C());
}