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ToAsyncEnumerable.cs
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ToAsyncEnumerable.cs
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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 System.Threading;
using System.Threading.Tasks;
using Xunit;
namespace Tests
{
public class ToAsyncEnumerable : AsyncEnumerableTests
{
[Fact]
public void ToAsyncEnumerable_Enumerable_Null()
{
Assert.Throws<ArgumentNullException>(() => AsyncEnumerable.ToAsyncEnumerable(default(IEnumerable<int>)));
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_Array()
{
var xs = new[] { 1, 2, 3, 4 }.ToAsyncEnumerable();
var e = xs.GetAsyncEnumerator();
await HasNextAsync(e, 1);
await HasNextAsync(e, 2);
await HasNextAsync(e, 3);
await HasNextAsync(e, 4);
await NoNextAsync(e);
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_Array_ToArray()
{
var arr = new[] { 1, 2, 3, 4, 5, 6, 7, 8 };
var xs = arr.ToAsyncEnumerable();
var res = await xs.ToArrayAsync();
Assert.Equal(arr, res);
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_Array_ToList()
{
var arr = new[] { 1, 2, 3, 4 };
var xs = arr.ToAsyncEnumerable();
var res = await xs.ToListAsync();
Assert.Equal(arr, res);
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_Array_Count()
{
var arr = new[] { 1, 2, 3, 4 };
var xs = arr.ToAsyncEnumerable();
var c = await xs.CountAsync();
Assert.Equal(arr.Length, c);
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_Array_SequenceIdentity()
{
var arr = new[] { 1, 2, 3, 4 };
var xs = arr.ToAsyncEnumerable();
await SequenceIdentity(xs);
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_Iterator()
{
var xs = ToAsyncEnumerable_Sequence().ToAsyncEnumerable();
var e = xs.GetAsyncEnumerator();
await HasNextAsync(e, 1);
await HasNextAsync(e, 2);
await HasNextAsync(e, 3);
await HasNextAsync(e, 4);
await NoNextAsync(e);
}
private IEnumerable<int> ToAsyncEnumerable_Sequence()
{
yield return 1;
yield return 2;
yield return 3;
yield return 4;
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_Iterator_Throw()
{
var ex = new Exception("Bang");
var xs = ToAsyncEnumerable_Sequence_Throw(ex).ToAsyncEnumerable();
var e = xs.GetAsyncEnumerator();
await HasNextAsync(e, 42);
await AssertThrowsAsync(e.MoveNextAsync(), ex);
}
private IEnumerable<int> ToAsyncEnumerable_Sequence_Throw(Exception e)
{
yield return 42;
throw e;
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_HashSet()
{
var set = new HashSet<int>(new[] { 1, 2, 3, 4 });
var xs = set.ToAsyncEnumerable();
var e = xs.GetAsyncEnumerator();
await HasNextAsync(e, 1);
await HasNextAsync(e, 2);
await HasNextAsync(e, 3);
await HasNextAsync(e, 4);
await NoNextAsync(e);
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_HashSet_ToArray()
{
var set = new HashSet<int>(new[] { 1, 2, 3, 4, 5, 6, 7, 8 });
var xs = set.ToAsyncEnumerable();
var arr = await xs.ToArrayAsync();
Assert.True(set.SetEquals(arr));
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_HashSet_ToList()
{
var set = new HashSet<int>(new[] { 1, 2, 3, 4 });
var xs = set.ToAsyncEnumerable();
var arr = await xs.ToListAsync();
Assert.True(set.SetEquals(arr));
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_HashSet_Count()
{
var set = new HashSet<int>(new[] { 1, 2, 3, 4 });
var xs = set.ToAsyncEnumerable();
var c = await xs.CountAsync();
Assert.Equal(set.Count, c);
}
[Fact]
public async Task ToAsyncEnumerable_Enumerable_HashSet_SequenceIdentity()
{
var set = new HashSet<int>(new[] { 1, 2, 3, 4 });
var xs = set.ToAsyncEnumerable();
await SequenceIdentity(xs);
}
[Fact]
public void ToAsyncEnumerable_Enumerable_HashSet_ICollection()
{
var set = new HashSet<int>(new[] { 1, 2, 3, 4 });
var xs = set.ToAsyncEnumerable();
var xc = xs as ICollection<int>;
Assert.NotNull(xc);
Assert.False(xc!.IsReadOnly);
xc.Add(5);
Assert.True(xc.Contains(5));
Assert.True(xc.Remove(5));
var arr = new int[4];
xc.CopyTo(arr, 0);
Assert.True(arr.SequenceEqual(xc));
xc.Clear();
Assert.Equal(0, xc.Count);
}
[Fact]
public void ToAsyncEnumerable_Enumerable_List_IList()
{
var set = new List<int> { 1, 2, 3, 4 };
var xs = set.ToAsyncEnumerable();
var xl = xs as IList<int>;
Assert.NotNull(xl);
Assert.False(xl!.IsReadOnly);
xl.Add(5);
Assert.True(xl.Contains(5));
Assert.True(xl.Remove(5));
xl.Insert(2, 10);
Assert.Equal(2, xl.IndexOf(10));
xl.RemoveAt(2);
xl[0] = 7;
Assert.Equal(7, xl[0]);
var arr = new int[4];
xl.CopyTo(arr, 0);
Assert.True(arr.SequenceEqual(xl));
xl.Clear();
Assert.Equal(0, xl.Count);
}
[Fact]
public void ToAsyncEnumerable_Observable_Null()
{
Assert.Throws<ArgumentNullException>(() => AsyncEnumerable.ToAsyncEnumerable(default(IObservable<int>)));
}
[Fact]
public async Task ToAsyncEnumerable_Observable_Return()
{
var subscribed = false;
var xs = new MyObservable<int>(obs =>
{
subscribed = true;
obs.OnNext(42);
obs.OnCompleted();
return new MyDisposable(() => { });
}).ToAsyncEnumerable();
Assert.False(subscribed);
var e = xs.GetAsyncEnumerator();
// NB: Breaking change to align with lazy nature of async iterators.
// Assert.True(subscribed);
await HasNextAsync(e, 42);
await NoNextAsync(e);
}
[Fact]
public async Task ToAsyncEnumerable_Observable_Throw()
{
var ex = new Exception("Bang!");
var subscribed = false;
var xs = new MyObservable<int>(obs =>
{
subscribed = true;
obs.OnError(ex);
return new MyDisposable(() => { });
}).ToAsyncEnumerable();
Assert.False(subscribed);
var e = xs.GetAsyncEnumerator();
// NB: Breaking change to align with lazy nature of async iterators.
// Assert.True(subscribed);
await AssertThrowsAsync(e.MoveNextAsync(), ex);
}
[Fact]
public async Task ToAsyncEnumerable_Observable_Dispose()
{
using var stop = new ManualResetEvent(false);
var xs = new MyObservable<int>(obs =>
{
var cts = new CancellationTokenSource();
Task.Run(async () =>
{
for (var i = 0; !cts.IsCancellationRequested; i++)
{
await Task.Delay(10);
obs.OnNext(i);
}
stop.Set();
});
return new MyDisposable(cts.Cancel);
}).ToAsyncEnumerable();
var e = xs.GetAsyncEnumerator();
for (var i = 0; i < 10; i++)
{
await HasNextAsync(e, i);
}
await e.DisposeAsync();
stop.WaitOne();
}
[Fact]
public async Task ToAsyncEnumerable_Observable_Zip()
{
using var stop = new ManualResetEvent(false);
var subCount = 0;
var xs = new MyObservable<int>(obs =>
{
subCount++;
var cts = new CancellationTokenSource();
Task.Run(async () =>
{
for (var i = 0; !cts.IsCancellationRequested; i++)
{
await Task.Delay(10);
obs.OnNext(i);
}
stop.Set();
});
return new MyDisposable(cts.Cancel);
}).ToAsyncEnumerable();
var e = xs.Zip(xs, (l, r) => l == r).GetAsyncEnumerator();
for (var i = 0; i < 10; i++)
{
await HasNextAsync(e, true);
}
await e.DisposeAsync();
stop.WaitOne();
Assert.Equal(2, subCount);
}
[Fact]
public async Task ToAsyncEnumerable_Observable_Cancel()
{
using var stop = new ManualResetEvent(false);
var xs = new MyObservable<int>(obs =>
{
var cts = new CancellationTokenSource();
Task.Run(async () =>
{
for (var i = 0; !cts.IsCancellationRequested; i++)
{
await Task.Delay(10);
obs.OnNext(i);
}
stop.Set();
});
return new MyDisposable(cts.Cancel);
}).ToAsyncEnumerable();
using var c = new CancellationTokenSource();
var e = xs.GetAsyncEnumerator(c.Token);
for (var i = 0; i < 10; i++)
{
await HasNextAsync(e, i);
}
c.Cancel();
stop.WaitOne();
}
[Fact]
public async Task ToAsyncEnumerable_Observable6_Async()
{
using var stop = new ManualResetEvent(false);
var xs = new MyObservable<int>(obs =>
{
var cts = new CancellationTokenSource();
Task.Run(async () =>
{
for (var i = 0; !cts.IsCancellationRequested; i++)
{
await Task.Yield();
obs.OnNext(i);
}
stop.Set();
});
return new MyDisposable(cts.Cancel);
}).ToAsyncEnumerable();
var e = xs.GetAsyncEnumerator();
for (var i = 0; i < 10_000; i++)
{
await HasNextAsync(e, i);
}
await e.DisposeAsync();
stop.WaitOne();
}
// TODO: Add more tests for Observable conversion.
[Fact]
public void ToAsyncEnumerable_Task_Null()
{
Assert.Throws<ArgumentNullException>(() => AsyncEnumerable.ToAsyncEnumerable(default(Task<int>)));
}
[Fact]
public async Task ToAsyncEnumerable_Task_With_Completed_TaskAsync()
{
var task = Task.Factory.StartNew(() => 36);
var xs = task.ToAsyncEnumerable();
var e = xs.GetAsyncEnumerator();
Assert.True(await e.MoveNextAsync());
Assert.Equal(36, e.Current);
Assert.False(await e.MoveNextAsync());
}
[Fact]
public async Task ToAsyncEnumerable_Task_With_Faulted_TaskAsync()
{
var ex = new InvalidOperationException();
var tcs = new TaskCompletionSource<int>();
tcs.SetException(ex);
var xs = tcs.Task.ToAsyncEnumerable();
var e = xs.GetAsyncEnumerator();
await AssertThrowsAsync(e.MoveNextAsync(), ex);
}
[Fact]
public async Task ToAsyncEnumerable_Task_With_Canceled_TaskAsync()
{
var tcs = new TaskCompletionSource<int>();
tcs.SetCanceled();
var xs = tcs.Task.ToAsyncEnumerable();
var e = xs.GetAsyncEnumerator();
await AssertThrowsAsync<TaskCanceledException>(e.MoveNextAsync().AsTask());
}
private sealed class MyObservable<T> : IObservable<T>
{
private readonly Func<IObserver<T>, IDisposable> _subscribe;
public MyObservable(Func<IObserver<T>, IDisposable> subscribe) => _subscribe = subscribe;
public IDisposable Subscribe(IObserver<T> observer) => _subscribe(observer);
}
private sealed class MyDisposable : IDisposable
{
private readonly Action _dispose;
public MyDisposable(Action dispose) => _dispose = dispose;
public void Dispose() => _dispose();
}
}
}