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Xamarin.UITest is for mobile apps only at this moment.
From the official document Xamarin.UITest, we could find that :
Xamarin.UITest is a C# testing framework using NUnit for UI Acceptance Tests on iOS and Android apps. It integrates tightly with Xamarin.iOS and Xamarin.Android projects, but it can also be used with native iOS and Android projects. Xamarin.UITest is the Automation Library that allows the NUnit tests to execute on Android and iOS devices.
So, Xamarin UI test couldn't used as automation test tool for Xamarin.Mac application currently.
Best Regards,
Jessie Zhang
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