LibTest/async/Stream/first_A02_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.

// @dart = 2.9

/// @assertion Future<T> first
/// If this stream is empty (a done event occurs before the first data event),
/// the resulting future completes with a StateError.
/// Except for the type of the error, this method is equivalent to
/// this.elementAt(0).
/// @description Checks that future completes with a StateError when this
/// stream is empty.
/// @author kaigorodov

library first_A02_t01;
import "../../../Utils/expect.dart";

void test(CreateStreamFunction create) {
  AsyncExpect.error((e) => e is StateError, create([]).first);
}