LibTest/async/Future/catchError_A03_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 abstract Future catchError(Function onError, {bool test(Object error)})
 * When this completes with an error, test is called with the error's value.
 * If the invocation returns true, onError is called with the error.
 * The result of onError is handled exactly the same as for then's onError.
 * If test returns false, the exception is not handled by onError, but is thrown unmodified,
 * thus forwarding it to f.
 * If test is omitted, it defaults to a function that always returns true.
 * @description Checks that if an exception is handled in [catchError] in
 * returned future, original future still raises that exception.
 * @author kaigorodov
 */
import "../../../Utils/async_utils.dart";
import "../../../Utils/expect.dart";

import "dart:async";

check(value) {
  Completer completer = new Completer();
  Future f = completer.future;
  
  asyncMultiStart(2);

  f.catchError((exception) {
    asyncEnd();
    return true;
  });

  f.then((fValue) {
      Expect.fail("no error");
    },
    onError:(Object asyncError){
      asyncEnd();
    }
  );

  completer.completeError(value);
}

main() {
  check(1);
  check('');
  check({});
  check(false);
}