LibTest/async/Future/Future.sync_A01_t03.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.sync(dynamic computation())
 * Creates a future containing the result of immediately calling computation.
 * If calling computation throws, the returned future is completed with the
 * error.
 * If calling computation returns a Future, completion of the created future
 * will wait until the returned future completes, and will then complete with
 * the same result.
 * If calling computation returns a non-future value, the returned future is
 * completed with that value.
 * @description Checks that if computation throws, the future completes with
 * the same error.
 * @author ilya
 */
import "dart:async";
import "../../../Utils/expect.dart";

check(value) {
  asyncStart();

  new Future.sync(() => throw value).then(
    (_) {
      Expect.fail("Created future should complete with error");
    },
    onError: (e) {
      if (value==null){
        Expect.isTrue(e is NullThrownError);
      } else {
        Expect.identical(value, e);
      }
      asyncEnd();
    }
  );
}

main() {
  check(0);
  check(1);
  check(-5);
  check('');
  check('string');
  check(null);
  check(true);
  check(const []);
  check(const {'k1': 1, 'k2': 2});
}