src/Workspaces/CoreTest/UtilityTest/CancellationSeriesTests.cs - main - githubmirror/roslyn

src/Workspaces/CoreTest/UtilityTest/CancellationSeriesTests.cs
131 строка4 KB
Cyrus Najmabadi
Use file scoped namespaces. (#77854)
27 мар 2025, 09:55
27 мар 2025, 09:5598d41b8
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

// NOTE: This code is derived from an implementation originally in dotnet/project-system:
// https://github.com/dotnet/project-system/blob/bdf69d5420ec8d894f5bf4c3d4692900b7f2479c/tests/Microsoft.VisualStudio.ProjectSystem.Managed.UnitTests/Threading/Tasks/CancellationSeriesTests.cs
//
// See the commentary in https://github.com/dotnet/roslyn/pull/50156 for notes on incorporating changes made to the
// reference implementation.

using System;
using System.Linq;
using System.Threading;
using Microsoft.CodeAnalysis.Threading;
using Xunit;

namespace Roslyn.Utilities;

public sealed class CancellationSeriesTests
{
    [Fact]
    public void CreateNext_ReturnsNonCancelledToken()
    {
        using var series = new CancellationSeries();
        var token = series.CreateNext();

        Assert.False(token.IsCancellationRequested);
        Assert.True(token.CanBeCanceled);
    }

    [Fact]
    public void CreateNext_CancelsPreviousToken()
    {
        using var series = new CancellationSeries();
        var token1 = series.CreateNext();

        Assert.False(token1.IsCancellationRequested);

        var token2 = series.CreateNext();

        Assert.True(token1.IsCancellationRequested);
        Assert.False(token2.IsCancellationRequested);

        var token3 = series.CreateNext();

        Assert.True(token2.IsCancellationRequested);
        Assert.False(token3.IsCancellationRequested);
    }

    [Fact]
    public void CreateNext_ThrowsIfDisposed()
    {
        var series = new CancellationSeries();

        series.Dispose();

        Assert.Throws<ObjectDisposedException>(() => series.CreateNext());
    }

    [Fact]
    public void CreateNext_ReturnsCancelledTokenIfSuperTokenAlreadyCancelled()
    {
        var cts = new CancellationTokenSource();

        using var series = new CancellationSeries(cts.Token);
        cts.Cancel();

        var token = series.CreateNext();

        Assert.True(token.IsCancellationRequested);
    }

    [Fact]
    public void CreateNext_ReturnsCancelledTokenIfInputTokenAlreadyCancelled()
    {
        var cts = new CancellationTokenSource();

        using var series = new CancellationSeries();
        cts.Cancel();

        var token = series.CreateNext(cts.Token);

        Assert.True(token.IsCancellationRequested);
    }

    [Fact]
    public void CancellingSuperTokenCancelsIssuedToken()
    {
        var cts = new CancellationTokenSource();

        using var series = new CancellationSeries(cts.Token);
        var token = series.CreateNext();

        Assert.False(token.IsCancellationRequested);

        cts.Cancel();

        Assert.True(token.IsCancellationRequested);
    }

    [Fact]
    public void CancellingInputTokenCancelsIssuedToken()
    {
        var cts = new CancellationTokenSource();

        using var series = new CancellationSeries();
        var token = series.CreateNext(cts.Token);

        Assert.False(token.IsCancellationRequested);

        cts.Cancel();

        Assert.True(token.IsCancellationRequested);
    }

    [Fact]
    public void CreateNext_HandlesExceptionsFromPreviousTokenRegistration()
    {
        using var series = new CancellationSeries();
        var token1 = series.CreateNext();

        var exception = new Exception();

        token1.Register(() => throw exception);

        var aggregateException = Assert.Throws<AggregateException>(() => series.CreateNext());

        Assert.Same(exception, aggregateException.InnerExceptions.Single());
        Assert.True(token1.IsCancellationRequested);
    }
}