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Editorial Team
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Asked: 2026-06-17T18:53:26+00:00

I am developing a Windows 8 store app. I added unit tests by choosing

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I am developing a Windows 8 store app. I added unit tests by choosing Solution >> Add >> new project >> Unit Test Library (Windows Store apps). I am then able to run the tests fine.

However, I then add a reference to my original Windows 8 store app project (following the instructions here), and when I try to run the tests again, I get the following error:

------ Discover test started ------
WriteTestCaseStarted
WriteTestCase Took Time = 3.0004
========== Discover test finished: 1 found (0:00:00.1350024) ==========
------ Run test started ------
Updating the layout...

Copying files: Total <1 mb to layout...

Registering the application to run from layout...

Deployment complete. Full package name: "c078c431-2a0d-4494-8dd9-47ae01ac938d_1.0.0.0_neutral__chny7cy2kxrnj"

Exception has been thrown by the target of an invocation.
========== Run test finished: 0 run (0:00:01.8770198) ==========

What am I doing wrong?

Update: Commenting out the following line from App.xaml solved the problem:

<ResourceDictionary Source="Common/StandardStyles.xaml"/>

Why?

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1 Answer

  1. Editorial Team

    Multiple things can cause this. Here are a couple I’ve found:

    • Application tag in app.xaml setting any properties (like RequestedTheme)
    • App.xaml referencing a ResourceDictionary which uses custom attached properties.

    Try commenting out contents of App.xaml to see if that helps.

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