vstest.console process failed to connect to testhost process after 90 seconds. This may occur due to machine slowness, please set environment variable VSTEST_CONNECTION_TIMEOUT to increase timeout.

@licon4812
you dont need to include full package!
instead of
<PackageReference Include="Microsoft.WindowsAppSDK" Version="1.8.250907003" />

you need to include Microsoft.WindowsAppSDK.WinUI meta package

@licon4812 you dont need to include full package! instead of <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.8.250907003" />

you need to include Microsoft.WindowsAppSDK.WinUI meta package

thanks for the tip