UnhandledExceptionEventHandler in MSTest doesn't show the exception

Description

Using the UnhandledExceptionEventHandler in MSTest doesn’t show any exception being caught.

Steps to reproduce

• Create a simple UnitTest project which could be either MSTest (.NET core) or UnitTest Project(.NET Framework)
• Attach an UnhandledException event handler to the AppDomain
• Create any kind of null reference or an InvalidOperation Exception and try to add it to your logger or Console Write the caught exception.

[TestClass]
public class UnitTest1
{
    [AssemblyInitialize]
    public static void AssemblyInitialize(TestContext testContext)
    {            
        AppDomain currentDomain = AppDomain.CurrentDomain;
        currentDomain.UnhandledException += currentDomain_UnhandledException;                     
    }

    static void currentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
    {
        Exception ex = e.ExceptionObject as Exception;
        if (ex != null)
        {
            Console.WriteLine("==========This is from Unhandled Exception EventHandler====================");
            Console.WriteLine("===============================");
            Console.WriteLine("Test failed:" + ex);
        }            
    }
    [TestInitialize]
    public void Initialize()
    {

    }

    [TestCleanup]
    public void Cleanup()
    {

    }
             
    [TestMethod]
    public void RaiseEvents()
    {        
        var list = new List<string>(); //empty list
        var firstItem = list.First().Contains("a");            
    }

    [AssemblyCleanup]
    public static void AssemblyCleanUp()
    {

    }
} 

Expected behavior

Should display the Unhandled exception

Actual behavior

Nothing is displayed in the output window under TestExplorer

Environment

• Window 10 Pro
• Build version of vstest.console: 15.9.1
• Microsoft.NET.Sdk 16.4.0
• MSTest.TestAdapter 2.0.0
• MSTest.TestFramework 2.0.0

[vik542]

@vikmy What is the intention here ?

Below is is just one of the example scenarios. I’m using MSTest for selenium :

In some of my tests I’m expecting that a collection contains some Ui elements(like dropdown values) but due to some functionality or due to some test data, collection will be either empty or it doesn’t contain the required data. In such cases when I’m trying to access the elements MSTest Platform throws Invalid Operation exception. Control or flow of execution goes directly to TestCleanup. When I wanted to access/capture the exception for my reports. I do not have any mechanism to capture such exceptions. TestContext has a property which tells me only the outcome of the test but it doesn’t give any exception information.

If you have the same scenario in some console projects you can capture the exceptions but the same is not available in MSTest.

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