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

check(value) {
  asyncStart();
  
  new Future.sync(() => throw value)
    .then((_) {
     Expect.fail('should not be called');
    })
    .catchError((e) {
      Expect.identical(value,null);
      asyncEnd();
    }, test: (e) => e is NullThrownError)
    .catchError((e) {
      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});
}