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test async enumerable

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This commit is contained in:
Bruno Garcia 2021-01-03 15:07:54 -05:00 committed by Ben Adams
parent 00695a8db1
commit c502ee90f6
3 changed files with 72 additions and 1 deletions
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3
Directory.Build.props
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@ -2,4 +2,7 @@
<PropertyGroup>
<LangVersion>latest</LangVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(TargetFramework)' != 'netstandard2.0' and !$(TargetFramework.StartsWith('netcoreapp2')) and !$(TargetFramework.StartsWith('net4'))">
<DefineConstants>$(DefineConstants);HAS_ASYNC_ENUMERATOR</DefineConstants>
</PropertyGroup>
</Project>

2
src/Ben.Demystifier/EnhancedStackTrace.Frames.cs
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@ -845,7 +845,7 @@ namespace System.Diagnostics
{
foundAttribute = true;
foundIteratorAttribute |= asma is IteratorStateMachineAttribute
#if NETSTANDARD2_1
#if HAS_ASYNC_ENUMERATOR
|| asma is AsyncIteratorStateMachineAttribute
#endif
;

68
test/Ben.Demystifier.Test/AsyncEnumerableTests.cs Normal file
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@ -0,0 +1,68 @@
#if HAS_ASYNC_ENUMERATOR
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;
using Xunit;
namespace Ben.Demystifier.Test
{
public class AsyncEnumerableTests
{
[Fact]
public async Task DemystifiesAsyncEnumerable()
{
Exception demystifiedException = null;
try
{
await foreach (var val in Start(CancellationToken.None))
{
_ = val;
}
}
catch (Exception ex)
{
demystifiedException = ex.Demystify();
}
// Assert
var stackTrace = demystifiedException.ToString();
stackTrace = LineEndingsHelper.RemoveLineEndings(stackTrace);
var trace = string.Join("", stackTrace.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)
.Skip(1)
.ToArray());
var expected = string.Join("", new[] {
" at async IAsyncEnumerable<int> Ben.Demystifier.Test.AsyncEnumerableTests.Throw(CancellationToken cancellationToken)+MoveNext()",
" at async IAsyncEnumerable<int> Ben.Demystifier.Test.AsyncEnumerableTests.Throw(CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult(short token)",
" at async IAsyncEnumerable<long> Ben.Demystifier.Test.AsyncEnumerableTests.Start(CancellationToken cancellationToken)+MoveNext()",
" at async IAsyncEnumerable<long> Ben.Demystifier.Test.AsyncEnumerableTests.Start(CancellationToken cancellationToken)+MoveNext()",
" at async IAsyncEnumerable<long> Ben.Demystifier.Test.AsyncEnumerableTests.Start(CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult(short token)",
" at async Task Ben.Demystifier.Test.AsyncEnumerableTests.DemystifiesAsyncEnumerable()",
" at async Task Ben.Demystifier.Test.AsyncEnumerableTests.DemystifiesAsyncEnumerable()"
});
Assert.Equal(expected, trace);
}
async IAsyncEnumerable<long> Start([EnumeratorCancellation] CancellationToken cancellationToken)
{
await Task.Delay(1, cancellationToken).ConfigureAwait(false);
yield return 1;
await foreach (var @throw in Throw(cancellationToken))
{
yield return @throw;
}
}
async IAsyncEnumerable<int> Throw([EnumeratorCancellation] CancellationToken cancellationToken)
{
yield return 2;
await Task.Delay(1, cancellationToken).ConfigureAwait(false);
throw new InvalidOperationException();
}
}
}
#endif