MSTest - unit test with StackOverflowException

Question

I wrote program in C# that invokes MSTest from command line. One of test cases throws StackOverflowException and it causes, that QtAgent32 (and my application) process breaks. What can I do to prevent from this situation (I can't change unit tests)?

Can you share your c# code? Ideally same dialog box should appear from the c# code as well and am wondering whether it has something to do with process startInfo parameters? — Aseem Bansal
– Aseem Bansal, Commented Nov 12, 2010 at 15:55

Aseem Bansal · Accepted Answer · 2010-11-12 16:03:13Z

3

One way by which you can avoid these kind of crashes is by setting the legacyUnhandledExceptionPolicy property in QTAgent32.exe.config (and/or QTAgent.exe.config depending upon the bitness of the machine/testrun) as mentioned here. Relevant text from this link is: -

As a temporary compatibility measure, administrators can place a compatibility flag in the section of the application configuration file. This causes the common language runtime to revert to the behavior of versions 1.0 and 1.1.

This will switch the "unhandled exception" handling behaviour to .net 1.1 and the process will not crash on such exceptions.

answered Nov 12, 2010 at 16:03

Aseem Bansal

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Community · Accepted Answer · 2017-05-23 11:44:34Z

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The problem is that you cannot catch StackOverflowException on .NET (starting with the 2.0 version). This probably means that there is no way to solve the problem you have - because the unit testing framework simply cannot catch the exception.

See the following related SO question:

C# catch a stack overflow exception.

There are some interesting suggestions on the other thread - for example, you can create Thread and check the current FrameCount to detect the stack overflow earlier. However, that probably won't be very reliable. So, I'm afraid there is no good answer...

edited May 23, 2017 at 11:44

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answered Nov 11, 2010 at 16:34

Tomas Petricek

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2 Comments

mirt Over a year ago

OK, but when I invoke MSTest from command line (not from C# code), when this unit test is executing I can just click cancel on error message box and MSTest continue to run. I don't know how to do something like this but in C# code

Michael Paulukonis Over a year ago

@mirt -- can you add that extra information into the original question? Those are good details.

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