LibTest/async/Stream/handleError_A07_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)})
/// If a broadcast stream is listened to more than once, each subscription will
/// individually perform the test and handle the error.
/// @description Checks that [test] and [onError] are called once per listener
/// per error.
/// @author a.semenov@unipro.ru

library handleError_A07_t01;

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

void test(CreateStreamWithErrorsFunction create) {
  Stream s = create(["a", 1, "b", 2, "c", 3], isError: (x) => x is num,
      defaultValue: 42);
  Map onErrorCalls = new Map();
  Map testCalls = new Map();
  asyncStart();
  s = s.asBroadcastStream().handleError((error) {
    onErrorCalls[error] = 1 + onErrorCalls.putIfAbsent(error, () => 0);
  }, test: (error) {
    testCalls[error] = 1 + testCalls.putIfAbsent(error, () => 0);
    return true;
  });
  Future.wait([s.toList(), s.toList(), s.toList()]).then((List<List> result) {
    result.forEach((r) => Expect.listEquals(["a", "b", "c"], r));
    Expect.equals(3, onErrorCalls.length);
    Expect.equals(3, testCalls.length);
    for (int e in [1, 2, 3]) {
      Expect.equals(3, onErrorCalls[e]);
      Expect.equals(3, testCalls[e]);
    }
    ;
    asyncEnd();
  });
}