AssemblyResolverTests.cs

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

using Microsoft.Testing.Platform.Acceptance.IntegrationTests;
using Microsoft.Testing.Platform.Acceptance.IntegrationTests.Helpers;
using Microsoft.Testing.Platform.Helpers;

namespace MSTest.Acceptance.IntegrationTests;

[TestClass]
public class AssemblyResolverTests : AcceptanceTestBase<AssemblyResolverTests.TestAssetFixture>
{
    private const string AssetName = "AssemblyResolverCrash";

    [TestMethod]
    // This test is for .NET Framework only.
    [OSCondition(OperatingSystems.Windows)]
    public async Task RunningTests_DoesNotHitResourceRecursionIssueAndDoesNotCrashTheRunner()
    {
        var testHost = TestHost.LocateFrom(AssetFixture.TargetAssetPath, AssetName, TargetFrameworks.NetFramework[0]);

        TestHostResult testHostResult = await testHost.ExecuteAsync(cancellationToken: TestContext.CancellationToken);

        testHostResult.AssertExitCodeIs(ExitCodes.Success);
    }

    public sealed class TestAssetFixture() : TestAssetFixtureBase()
    {
        public string TargetAssetPath => GetAssetPath(AssetName);

        public override (string ID, string Name, string Code) GetAssetsToGenerate() => (AssetName, AssetName,
                SourceCode
                .PatchTargetFrameworks(TargetFrameworks.NetFramework)
                .PatchCodeWithReplace("$MSTestVersion$", MSTestVersion));

        private const string SourceCode = """
#file AssemblyResolverCrash.csproj
<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <EnableMSTestRunner>true</EnableMSTestRunner>
    <TargetFrameworks>$TargetFrameworks$</TargetFrameworks>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="MSTest.TestAdapter" Version="$MSTestVersion$" />
    <PackageReference Include="MSTest.TestFramework" Version="$MSTestVersion$" />
  </ItemGroup>

</Project>

#file UnitTest1.cs
using System;
using System.Globalization;
using System.IO;
using System.IO.IsolatedStorage;
using System.Threading;

using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace RecursiveResourceLookupCrash
{
    [TestClass]
    public class RecursiveResourceLookupCrashTests
    {
        [TestInitialize]
        public void TestInitialize()
        {

        }

        [TestMethod]
        public void CrashesOnResourcesLookupWhenNotHandledByAssemblyResolver()
        {
            // You need to set non-English culture explicitly to reproduce recursive resource
            // lookup bug in English environment.
            Thread.CurrentThread.CurrentUICulture = new CultureInfo("ja-JP");

            try
            {
                // This will internally trigger file not found exception, and try to find ja-JP resources
                // for the string, which will trigger Resolve in AssemblyResolver, which will
                // use File.Exists call and that will trigger another round of looking up ja-JP
                // resources, until this is detected by .NET Framework, and Environment.FailFast
                // is called to crash the testhost.
                var stream = new IsolatedStorageFileStream("non-existent-filename", FileMode.Open);
            }
            catch (Exception)
            {
            }
        }
    }
}
""";
    }

    public TestContext TestContext { get; set; }
}