Running MSTest In An MTA

Running Tests as 'MTA'

Dominic Hopton's Blog — Mon, 22 Oct 2007 19:08:52 GMT

There was an internal discussion this week about the need to run unit tests under MTA threads, rather

Running Unit tests as MTA rather than STA

VSTS Quality Tools — Mon, 22 Oct 2007 19:10:55 GMT

Ever done complex interop testing where you wanted to run as MTA? Needed to call WaitHandle.WaitAll?

Running Unit tests as MTA rather than STA

Noticias externas — Mon, 22 Oct 2007 19:38:49 GMT

Ever done complex interop testing where you wanted to run as MTA? Needed to call WaitHandle.WaitAll?

re: Running MSTest In An MTA

Kris — Tue, 23 Oct 2007 08:44:55 GMT

What is the reason why the MSTest runs in STA by default? I can understand if it is a WinForms app, but for testing a library of code why does the test default to STA?

re: Running MSTest In An MTA

ploeh — Tue, 23 Oct 2007 10:53:44 GMT

Performance, they told me.

re: Running MSTest In An MTA

Anup — Mon, 12 Nov 2007 11:38:40 GMT

This post was very helpful to me.

Thanks.

re: Running MSTest In An MTA

Ben Szymkow — Tue, 08 Jan 2008 06:24:45 GMT

This article was helpful to me. Thank you!

re: Running MSTest In An MTA

Juanma — Tue, 24 Jun 2008 14:47:17 GMT

Hi, i found your post via MSDN Forums.

I set the configuration file like this:

<?xml version="1.0" encoding="UTF-8"?>

<Description>This is a default test run configuration for a local test run.</Description>

</TestRunConfiguration>

But I still getting the same error:

FatalExecutionEngineError was detected

Message: The runtime has encountered a fatal error. The address of the error was at 0x79eb59e7, on thread 0x79c. The error code is 0xc0000005. This error may be a bug in the CLR or in the unsafe or non-verifiable portions of user code. Common sources of this bug include user marshaling errors for COM-interop or PInvoke, which may corrupt the stack.

I'm working with VS 2008 and I don't know what I'm doing wrong.

Thanks

re: Running MSTest In An MTA

ploeh — Thu, 26 Jun 2008 02:09:43 GMT

Hi Juanma

Thank you for your question.

While I don't know why you get that specific error, to verify my previous description I just loaded up my sample project in Visual Studio 2008 to see if I would have the same problem, which I don't.

My guess is that your problem isn't specifically related to the execution thread's apartment state, but I can't be sure.

If you'd like, I can send you my sample project so you can run it to give you an indication whether you are having a problem with your specific project or perhaps your VS installation or something else.

In this case, drop me a line via the blog's Contact form so I get your e-mail address, and I'll send you the sample code.

re: Running MSTest In An MTA

deepak — Thu, 10 Jul 2008 12:28:41 GMT

after adding the line <ExecutionThread apartmentState="1" /> in testrunconfig file

I am getting the following error :

Invalid cast from 'System.String' to 'System.Threading.ApartmentState'.

I am using vs2008. let me know, if i am missing anything...

re: Running MSTest In An MTA

ploeh — Thu, 10 Jul 2008 12:38:29 GMT

Hi deepak

As I responded to Juanma, I can send you my sample project so you can take a look at that. If you are interested, drop me a line via the blog's Contact form.

re: Running MSTest In An MTA

Stanislav Dvoychenko — Sun, 21 Sep 2008 01:21:03 GMT

Hi Mark,

Thanks for sharing. As I required granular ability to use MTA or STA within a test run I put together a simple helper class to achieve this: http://plainoldstan.blogspot.com/2008/09/run-unit-test-on-mta-thread-vsts-test.html

Please let me know if there are drawbacks if you would have a spare minute.

re: Running MSTest In An MTA

ploeh — Mon, 22 Sep 2008 21:47:18 GMT

Hi Stanislav

Thank you for sharing. I posted a more elaborate comment directly at your post :)