Improve quality of test suite - #80

This call site is reachable on all platforms. 'AppBuilderExtensions.UseMauiCommunityToolkit(MauiAppBuilder, Action<Options>?)' is only supported on: 'Android' 21.0 and later, 'iOS' 15.0 and later, 'maccatalyst' 15.0 and later, 'Tizen' 6.5 and later, 'Windows' 10.0.17763 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)