Testing for terminating/non-terminating errors

[Trond Hindenes]

Hi, 

Just getting started with Pester so bear with me :-)

I'd like to use Pester to test that a function doesn't throw (terminating) errors when it shouldn't.

As far as I can see the "should" keyword already has support for "throw", but in order to test for non-terminating errors I guess I have to look at the error stream and check that the expected error is output. I can't find any documentation on how to do that, is there a pattern I could implement in order to do this easily?

[Dave Wyatt]

Well, if you want to know that it didn't throw a terminating error, just use "Should Not Throw".  If you want to do validation on the non-terminating error, then yeah, you'd need to capture the ErrorRecord yourself and do some tests on its properties.  Something like this:

It 'Produces an error' {

    Do-Something -ErrorAction SilentlyContinue -ErrorVariable myErr

    $myErr.Count | Should Be 1

    $myErr.Exception.Message | Should Be 'Holy crap, something went wrong!'

    # etc

}

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[Trond Hindenes]

Cool, that make sense. Thanks!