// 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.

// @dart = 2.9

/// @assertion Future<T> single
/// Returns the single element.
/// If this is empty or has more than one element throws a StateError.
/// @description Checks that a error is thrown if this is empty or has more
/// than one element.
/// @author kaigorodov

library single_A02_t01;
import "../../../Utils/expect.dart";

void test(CreateStreamFunction create) {
  AsyncExpect.error((e) => e is StateError, create([]).single);
  AsyncExpect.error((e) => e is StateError, create([1, 2]).single);
  AsyncExpect.error((e) => e is StateError, create(["a", "b", "c"]).single);
}