This adds a set of unit tests to WinUIGallery.
The initial set of tests are mostly just to serve as a demonstration of
how to write tests in MSTest for WinUI. But as new features are added to
WinUI we can optionally write them in a more unit-testable way and add
new tests here. Unit tests have the advantage of being quicker and more
reliable that UI Interaction tests which is where we are getting most of
the coverage now.
I've also updated the Azure Pipeline job to execute the unit tests as
part of the build.
This PR updates the version of WinAppSDK from 1.4 to 1.5 Preview1. Once
1.5.0 stable is released we should update to that.
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Co-authored-by: Keith Mahoney <you@example.com>
Karen
Scott Jones
Keith Mahoney
Marcel Wagner