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- // Licensed to the .NET Foundation under one or more agreements.
- // The .NET Foundation licenses this file to you under the Apache 2.0 License.
- // See the LICENSE file in the project root for more information.
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using Xunit;
- namespace Tests
- {
- public class Defer : AsyncEnumerableExTests
- {
- [Fact]
- public void Defer_Null()
- {
- Assert.Throws<ArgumentNullException>(() => AsyncEnumerableEx.Defer<int>(default(Func<IAsyncEnumerable<int>>)));
- }
- [Fact]
- public async System.Threading.Tasks.Task Defer1Async()
- {
- var x = 0;
- var xs = AsyncEnumerableEx.Defer<int>(() => new[] { x }.ToAsyncEnumerable());
- {
- var e = xs.GetAsyncEnumerator();
- await HasNextAsync(e, 0);
- await NoNextAsync(e);
- }
- {
- x++;
- var e = xs.GetAsyncEnumerator();
- await HasNextAsync(e, 1);
- await NoNextAsync(e);
- }
- }
- }
- }
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