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Leonid PershinandClaude Opus 5 3db9d4dfc6 Scaffold AvParser: Avalonia 12 shell with adaptive layout
Greenfield skeleton for a parser desktop app. The domain is deliberately a
placeholder — IParser<TIn,TOut> plus two sample parsers — so the shell is
runnable and verifiable end to end before real logic lands.

Layers run one way: Core (no Avalonia, no IO) <- Infrastructure <- UI <- Desktop.
UI is a class library rather than the exe so headless tests build real views
without dragging in Program.cs, Serilog or the container.

Adaptive layout is built from what Avalonia actually offers, since it has no
AdaptiveTrigger or media queries: ResponsiveLayout observes Visual.Bounds and
projects a breakpoint onto both an attached property and :compact/:medium/
:expanded pseudoclasses, with 24px hysteresis so dragging a window edge cannot
make the layout flap. Pane state lives in the view model because a style setter
loses to a local value permanently; styles own only the visual variance.

Stack notes worth remembering: Avalonia.ReactiveUI is deprecated in favour of
ReactiveUI.Avalonia, and ReactiveUI 24 runs on the Primitives engine (RxVoid,
ISequencer, Signal<T>) and no longer self-initialises. Avalonia.Headless.XUnit
12.x requires xUnit v3. InvariantGlobalization must stay false or Semi.Avalonia
throws in its static constructor.

102 tests across three projects, including headless guards for the two failures
that are otherwise completely silent: a stylesheet whose selectors match nothing,
and a light palette too low-contrast for cards to read.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-13 16:07:08 +03:00

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XML

<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<RootNamespace>AvParser.UI.Tests</RootNamespace>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\..\src\AvParser.Core\AvParser.Core.csproj" />
<ProjectReference Include="..\..\src\AvParser.Infrastructure\AvParser.Infrastructure.csproj" />
<ProjectReference Include="..\..\src\AvParser.UI\AvParser.UI.csproj" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="ReactiveUI.Testing" />
</ItemGroup>
<ItemGroup>
<!-- Subscribe(Action&lt;T&gt;) and the operator set live here; without it every test file
needs the same using just to call .Subscribe on an IObservable. -->
<Using Include="ReactiveUI.Primitives" />
</ItemGroup>
</Project>