LibTest/async/Stream/handleError_A05_t01.test.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 Stream<T> handleError(Function onError, {bool test(error)})
/// The onError callback must be of type void onError(error) or
/// void onError(error, StackTrace stackTrace). Depending on the function type
/// the the stream either invokes onError with or without a stack trace. The
/// stack trace argument might be null if the stream itself received an error
/// without stack trace.
/// @description Checks that onError callback with two parameters can be used
/// in which case the second parameter is a stack trace.
/// @author a.semenov@unipro.ru

library handleError_A05_t01;

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

void test(CreateStreamWithErrorsFunction create) {
  List errors = [];
  List traces = [];
  asyncStart();
  Stream s = create([1, 2, 3, 4, 5], isError: (x) => true, defVal: 42);
  s.handleError((error, stackTrace) {
    errors.add(error);
    traces.add(stackTrace);
  }).listen((data) {
    // ignore
  }, onDone: () {
    Expect.listEquals([1, 2, 3, 4, 5], errors);
    Expect.equals(5, traces.length);
    traces.forEach((st) {
      Expect.isTrue(st == null || st is StackTrace);
    });
    asyncEnd();
  });
}