CODEWITHSUNDEEP
c#wpfunit-testingmstestxamlparseexception
Sarah Vessels
Sarah Vessels

Reputation: 31640

WPF - XamlParseException when unit testing method in Window class

I'm trying to use MSTest to write unit tests for methods in my MainWindow class in my WPF application. However, I get the following exception:

System.Windows.Markup.XamlParseException: 'Provide value on 'System.Windows.StaticResourceExtension' threw an exception.' Line number '127' and line position '32'. ---> System.Exception: Cannot find resource named 'verticalLineStyle'. Resource names are case sensitive.

verticalLineStyle is found in a ResourceDictionary that is included in App.xaml. I have no need of this style to test the method I'm trying to test, but I can't get past this. I'm just creating a new instance of MainWindow in my unit test and trying to call an instance method on that. The exception occurs when I try to create the instance of MainWindow. MainWindow is defined as public partial class MainWindow : Window.

How do I get rid of this error? Is there some preferred way of unit testing methods in windows in WPF applications?

Upvotes: 3

Views: 2273

Answers (2)

Alexey
Alexey

Reputation: 261

Application.LoadComponent(
    new Uri("/MyAppAssemblyName;component/App.xaml", UriKind.Relative));

This helped me.

Upvotes: 7

Goblin
Goblin

Reputation: 8022

The problem is that the test does not have access to App.xaml as the application is not started. You might want to look into TestApi for anything related to testing WPF visuals (link)

Hope this helps!

Upvotes: 0

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