feat(code-viewer): native WinUI 3 code viewer replacing WebView2/VS Code embed

.github/workflows/code-viewer-unit-tests.yml

@@ -0,0 +1,52 @@
+name: Code Viewer Unit Tests
+
+on:
+  push:
+    branches:
+      - 'agents/native-code-viewer-integration'
+      - 'main'
+  pull_request:
+    branches:
+      - 'main'
+
+permissions:
+  contents: read
+
+jobs:
+  unit-tests:
+    name: Run code viewer unit tests
+    runs-on: windows-latest
+    timeout-minutes: 15
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up .NET SDK
+        uses: actions/setup-dotnet@v4
+        with:
+          global-json-file: ./global.json
+
+      - name: Restore dependencies
+        run: dotnet restore JitHub.WinUI.Tests/JitHub.WinUI.Tests.csproj -p:Platform=x64
+
+      - name: Build test project
+        run: dotnet build JitHub.WinUI.Tests/JitHub.WinUI.Tests.csproj -c Debug -p:Platform=x64 --no-restore
+
+      - name: Run unit tests
+        run: >
+          dotnet test JitHub.WinUI.Tests/JitHub.WinUI.Tests.csproj
+          -c Debug
+          -p:Platform=x64
+          --no-build
+          --logger "trx;LogFileName=test-results.trx"
+          --collect:"XPlat Code Coverage"
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results
+          path: |
+            **/*.trx
+            **/coverage.cobertura.xml

.github/workflows/jithub-store-release.yml

@@ -7,11 +7,6 @@ on:
         description: Four-part Store package version (for example 1.6.5.0)
         required: true
         type: string
-      editor_assets_ref:
-        description: jithub-vs-code ref to build for artifacts\EditorAssets\dist
-        required: false
-        default: master
-        type: string
       use_signing_certificate:
         description: Sign the package with the configured PFX before Store upload. Leave false to match the existing Store-upload flow where Partner Center re-signs the submitted package.
         required: false
@@ -69,45 +64,18 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Checkout jithub-vs-code
-        uses: actions/checkout@v4
-        with:
-          repository: nerocui/jithub-vs-code
-          ref: ${{ inputs.editor_assets_ref }}
-          path: editor-assets
-
-      - name: Set up Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: 22
-          cache: yarn
-          cache-dependency-path: editor-assets/yarn.lock
-
       - name: Set up .NET SDK
         uses: actions/setup-dotnet@v4
         with:
           global-json-file: ./global.json
 
-      - name: Install editor asset dependencies
-        working-directory: editor-assets
-        shell: pwsh
-        run: yarn --frozen-lockfile
-
       - name: Set up Microsoft Store CLI
         uses: microsoft/microsoft-store-apppublisher@v1.3
 
       - name: Verify Microsoft Store CLI
         shell: pwsh
         run: msstore --help
 
-      - name: Build editor assets
-        shell: pwsh
-        run: >
-          .\eng\Sync-JitHubVsCodeAssets.ps1
-          -VsCodeRepoPath "${{ github.workspace }}\editor-assets"
-          -DestinationPath "${{ github.workspace }}\artifacts\EditorAssets\dist"
-          -SkipInstall
-
       - name: Patch Store manifest values
         shell: pwsh
         run: >

.github/workflows/winapp-cli-smoke.yml

@@ -4,15 +4,10 @@ on:
   workflow_dispatch:
     inputs:
       verify_debug_build:
-        description: Build JitHub.WinUI after installing winapp. This also builds editor assets from jithub-vs-code.
+        description: Build JitHub.WinUI after installing winapp.
         required: false
         default: false
         type: boolean
-      editor_assets_ref:
-        description: jithub-vs-code ref to build when verify_debug_build is true.
-        required: false
-        default: master
-        type: string
 
 permissions:
   contents: read
@@ -41,37 +36,6 @@ jobs:
           winapp create-debug-identity --help
           winapp ui --help
 
-      - name: Checkout jithub-vs-code
-        if: ${{ inputs.verify_debug_build }}
-        uses: actions/checkout@v4
-        with:
-          repository: nerocui/jithub-vs-code
-          ref: ${{ inputs.editor_assets_ref }}
-          path: editor-assets
-
-      - name: Set up Node.js
-        if: ${{ inputs.verify_debug_build }}
-        uses: actions/setup-node@v4
-        with:
-          node-version: 22
-          cache: yarn
-          cache-dependency-path: editor-assets/yarn.lock
-
-      - name: Install editor asset dependencies
-        if: ${{ inputs.verify_debug_build }}
-        working-directory: editor-assets
-        shell: pwsh
-        run: yarn --frozen-lockfile
-
-      - name: Build editor assets
-        if: ${{ inputs.verify_debug_build }}
-        shell: pwsh
-        run: >
-          .\eng\Sync-JitHubVsCodeAssets.ps1
-          -VsCodeRepoPath "${{ github.workspace }}\editor-assets"
-          -DestinationPath "${{ github.workspace }}\artifacts\EditorAssets\dist"
-          -SkipInstall
-
       - name: Build WinUI debug app
         if: ${{ inputs.verify_debug_build }}
         shell: pwsh

JitHub.WinUI.Tests/JitHub.WinUI.Tests.csproj

@@ -0,0 +1,40 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0-windows10.0.19041.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+    <Platform Condition="'$(Platform)' == ''">x64</Platform>
+    <Platforms>x86;x64;ARM64</Platforms>
+    <RuntimeIdentifier Condition="'$(RuntimeIdentifier)' == '' and '$(Platform)' == 'x86'">win-x86</RuntimeIdentifier>
+    <RuntimeIdentifier Condition="'$(RuntimeIdentifier)' == '' and '$(Platform)' == 'x64'">win-x64</RuntimeIdentifier>
+    <RuntimeIdentifier Condition="'$(RuntimeIdentifier)' == '' and '$(Platform)' == 'ARM64'">win-arm64</RuntimeIdentifier>
+    <!-- Suppress warnings about Windows-specific APIs in test context -->
+    <NoWarn>$(NoWarn);CA1416</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <!-- Link pure C# service/model source files from JitHub.WinUI (no WinUI/XAML deps) -->
+    <Compile Include="..\JitHub.WinUI\Models\CodeViewer\*.cs" Link="Models\%(Filename)%(Extension)" />
+    <Compile Include="..\JitHub.WinUI\Services\CodeViewer\IFilePreviewResolver.cs" Link="Services\%(Filename)%(Extension)" />
+    <Compile Include="..\JitHub.WinUI\Services\CodeViewer\ILanguageIdResolver.cs" Link="Services\%(Filename)%(Extension)" />
+    <Compile Include="..\JitHub.WinUI\Services\CodeViewer\IRepoFileCacheService.cs" Link="Services\%(Filename)%(Extension)" />
+    <Compile Include="..\JitHub.WinUI\Services\CodeViewer\FilePreviewResolver.cs" Link="Services\%(Filename)%(Extension)" />
+    <Compile Include="..\JitHub.WinUI\Services\CodeViewer\LanguageIdResolver.cs" Link="Services\%(Filename)%(Extension)" />
+    <Compile Include="..\JitHub.WinUI\Services\CodeViewer\RepoFileCacheService.cs" Link="Services\%(Filename)%(Extension)" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="NSubstitute" Version="5.3.0" />
+    <PackageReference Include="coverlet.collector" Version="6.0.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+</Project>

JitHub.WinUI.Tests/NuGet.config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <clear />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
+  </packageSources>
+</configuration>