LibTest/isolate/ReceivePort/elementAt_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<T> elementAt(int index)
 * If a done event occurs before the value is found, the future completes with a RangeError.
 * @description Checks that if a done event occurs before the value is found,
 * the future completes with a RangeError.
 * @author kaigorodov
 */
import "dart:async";
import "../../../Utils/expect.dart";
import "IsolateStream.dart" as IsolateStream;

void checkError(Stream s, index) {
  asyncStart();
  s.elementAt(index).then((actual) {
    Expect.fail("unexpected onValue call");
  }, onError: (error) {
    Expect.isTrue(error is RangeError, "error is ${error.runtimeType}");
    asyncEnd();
  });
}

main() {
  checkError(IsolateStream.fromIterable([]), 1);
  for (int k = 1; k < 10; k++) {
    Iterable it = new Iterable.generate(k - 1, (int index) => index);
    checkError(IsolateStream.fromIterable(it), k);
  }
}