LibTest/async/Future/catchError_A03_t01.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 catchError(Function onError, {bool test(Object error)})
///    If this future completes with an error, then test is first called with
/// the error value.
///    If test returns false, the exception is not handled by this catchError,
/// and the returned future completes with the same error and stack trace as
/// this future.
///    If test returns true, onError is called with the error and possibly stack
/// trace, and the returned future is completed with the result of this call in
/// exactly the same way as for then's onError.
/// @description Checks that [test] is called first with the error value, if
/// future completes with an error
/// @author a.semenov@unipro.ru

import "dart:async";
import "../../../Utils/expect.dart";

main() {
  Completer completer = new Completer();
  Future f = completer.future;
  List log = [];

  f.catchError(
    (Object error) {
      log.add(2);
      log.add(error);
    },
    test: (Object error) {
      log.add(1);
      log.add(error);
      return true;
    }
  ).then(
    (_) {
      Expect.listEquals([1, "!", 2, "!"], log);
      asyncEnd();
    }
  );

  asyncStart();
  completer.completeError("!");
}