feat(01-01): add xUnit test project with 7 stub test files

- SharepointToolbox.Tests targeting net10.0-windows with UseWPF=true
- Moq 4.20.72 added for future mocking
- 7 stub test files across Services, Auth, ViewModels, Localization, Integration
- All tests marked [Fact(Skip)] referencing implementation plan — 0 failed, 7 skipped
- Solution build: 0 errors, 0 warnings

SharepointToolbox.Tests/Auth/MsalClientFactoryTests.cs

@@ -0,0 +1,7 @@
+namespace SharepointToolbox.Tests.Auth;
+
+public class MsalClientFactoryTests
+{
+    [Fact(Skip = "Wave 0 stub — implemented in plan 01-04")]
+    public void CreateClient_Returns_ConfiguredPublicClientApplication() { }
+}

SharepointToolbox.Tests/Auth/SessionManagerTests.cs

@@ -0,0 +1,7 @@
+namespace SharepointToolbox.Tests.Auth;
+
+public class SessionManagerTests
+{
+    [Fact(Skip = "Wave 0 stub — implemented in plan 01-04")]
+    public void GetContext_Returns_ClientContext_For_ConnectedTenant() { }
+}

SharepointToolbox.Tests/Integration/LoggingIntegrationTests.cs

@@ -0,0 +1,7 @@
+namespace SharepointToolbox.Tests.Integration;
+
+public class LoggingIntegrationTests
+{
+    [Fact(Skip = "Wave 0 stub — implemented in plan 01-05")]
+    public void Serilog_WritesTo_RollingFile_On_Startup() { }
+}

SharepointToolbox.Tests/Localization/TranslationSourceTests.cs

@@ -0,0 +1,7 @@
+namespace SharepointToolbox.Tests.Localization;
+
+public class TranslationSourceTests
+{
+    [Fact(Skip = "Wave 0 stub — implemented in plan 01-05")]
+    public void ChangeLanguage_Updates_Bound_Strings() { }
+}

SharepointToolbox.Tests/Services/ProfileServiceTests.cs

@@ -0,0 +1,7 @@
+namespace SharepointToolbox.Tests.Services;
+
+public class ProfileServiceTests
+{
+    [Fact(Skip = "Wave 0 stub — implemented in plan 01-03")]
+    public void SaveAndLoad_RoundTrips_Profiles() { }
+}

SharepointToolbox.Tests/Services/SettingsServiceTests.cs

@@ -0,0 +1,7 @@
+namespace SharepointToolbox.Tests.Services;
+
+public class SettingsServiceTests
+{
+    [Fact(Skip = "Wave 0 stub — implemented in plan 01-03")]
+    public void SaveAndLoad_RoundTrips_Settings() { }
+}

SharepointToolbox.Tests/SharepointToolbox.Tests.csproj

@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0-windows</TargetFramework>
+    <UseWPF>true</UseWPF>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Moq" Version="4.20.72" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\SharepointToolbox\SharepointToolbox.csproj" />
+  </ItemGroup>
+
+</Project>

SharepointToolbox.Tests/ViewModels/FeatureViewModelBaseTests.cs

@@ -0,0 +1,7 @@
+namespace SharepointToolbox.Tests.ViewModels;
+
+public class FeatureViewModelBaseTests
+{
+    [Fact(Skip = "Wave 0 stub — implemented in plan 01-06")]
+    public void CancelCommand_Cancels_RunningOperation() { }
+}

SharepointToolbox.slnx

@@ -1,3 +1,4 @@
 <Solution>
+  <Project Path="SharepointToolbox.Tests/SharepointToolbox.Tests.csproj" />
   <Project Path="SharepointToolbox/SharepointToolbox.csproj" />
 </Solution>