fix(ci): fix xunit test, net48 build isolation, mock server check, Pester config

- Update BaseUrl test to expect trailing slash (matches code change)
- Revert upload-artifact to v4 (v5 doesn't exist yet)
- Build net48 job restores only src/test projects (excludes MockServer)
- MockServer.Tests.ps1: fix net10.0 -> net9.0 DLL paths, fix build check
- Unit tests: use New-PesterConfiguration instead of -CI flag (fixes
  AmbiguousParameterSet on PS 5.1), exclude MockIntegration tag

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/build.yml

@@ -16,9 +16,13 @@ jobs:
         with:
           dotnet-version: '9.0.x'
       - name: Restore dependencies
-        run: dotnet restore
+        run: |
+          dotnet restore src/PSProxmoxVE/PSProxmoxVE.csproj
+          dotnet restore tests/PSProxmoxVE.Core.Tests/PSProxmoxVE.Core.Tests.csproj
       - name: Build net48
-        run: dotnet build --configuration Release --framework net48 --no-restore
+        run: |
+          dotnet build src/PSProxmoxVE/PSProxmoxVE.csproj --configuration Release --framework net48 --no-restore
+          dotnet build tests/PSProxmoxVE.Core.Tests/PSProxmoxVE.Core.Tests.csproj --configuration Release --framework net48 --no-restore
       - name: Test net48
         run: dotnet test tests/PSProxmoxVE.Core.Tests/PSProxmoxVE.Core.Tests.csproj --configuration Release --framework net48 --no-build --verbosity normal --collect:"XPlat Code Coverage" --results-directory ./coverage
       - name: Upload coverage

.github/workflows/integration-tests.yml

@@ -217,7 +217,7 @@ jobs:
 
       - name: Upload test results
         if: always()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v4
         with:
           name: integration-test-results
           path: TestResults/

.github/workflows/unit-tests.yml

@@ -93,14 +93,30 @@ jobs:
         shell: powershell
         run: |
           Import-Module Pester -MinimumVersion 5.0
-          Invoke-Pester tests/PSProxmoxVE.Tests -ExcludeTag Integration -CI -OutputFormat NUnitXml -OutputFile TestResults/pester-results.xml
+          $config = New-PesterConfiguration
+          $config.Run.Path = "tests/PSProxmoxVE.Tests"
+          $config.Run.Exit = $true
+          $config.Filter.ExcludeTag = @("Integration", "MockIntegration")
+          $config.Output.Verbosity = "Detailed"
+          $config.TestResult.Enabled = $true
+          $config.TestResult.OutputFormat = "NUnitXml"
+          $config.TestResult.OutputPath = "TestResults/pester-results.xml"
+          Invoke-Pester -Configuration $config
 
       - name: Run Pester tests (PS 7.x)
         if: matrix.ps_version != '5.1'
         shell: pwsh
         run: |
           Import-Module Pester -MinimumVersion 5.0
-          Invoke-Pester tests/PSProxmoxVE.Tests -ExcludeTag Integration -CI -OutputFormat NUnitXml -OutputFile TestResults/pester-results.xml
+          $config = New-PesterConfiguration
+          $config.Run.Path = "tests/PSProxmoxVE.Tests"
+          $config.Run.Exit = $true
+          $config.Filter.ExcludeTag = @("Integration", "MockIntegration")
+          $config.Output.Verbosity = "Detailed"
+          $config.TestResult.Enabled = $true
+          $config.TestResult.OutputFormat = "NUnitXml"
+          $config.TestResult.OutputPath = "TestResults/pester-results.xml"
+          Invoke-Pester -Configuration $config
 
       - name: Upload test results
         if: always()

tests/PSProxmoxVE.Core.Tests/Authentication/PveSessionTests.cs

@@ -42,7 +42,7 @@ namespace PSProxmoxVE.Core.Tests.Authentication
         {
             var session = new PveSession(TestHostname, TestPort, false, "root@pam!mytoken=aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee");
 
-            Assert.Equal($"https://{TestHostname}:{TestPort}/api2/json", session.BaseUrl);
+            Assert.Equal($"https://{TestHostname}:{TestPort}/api2/json/", session.BaseUrl);
         }
 
         [Fact]

tests/PSProxmoxVE.Tests/MockIntegration/MockServer.Tests.ps1

@@ -20,17 +20,20 @@ BeforeAll {
 
     # Find the built module DLL
     $dllSearchPaths = @(
-        (Join-Path $PSScriptRoot '../../PSProxmoxVE.MockServer/bin/Release/net10.0/PSProxmoxVE.MockServer.dll'),
+        (Join-Path $PSScriptRoot '../../PSProxmoxVE.MockServer/bin/Release/net9.0/PSProxmoxVE.MockServer.dll'),
-        (Join-Path $PSScriptRoot '../../PSProxmoxVE.MockServer/bin/Debug/net10.0/PSProxmoxVE.MockServer.dll')
+        (Join-Path $PSScriptRoot '../../PSProxmoxVE.MockServer/bin/Debug/net9.0/PSProxmoxVE.MockServer.dll')
     )
     $mockServerDll = $dllSearchPaths | Where-Object { Test-Path $_ } | Select-Object -First 1
 
     if (-not $mockServerDll) {
         # Build it
-        $buildOutput = dotnet build $mockServerProject --configuration Release 2>&1
+        $buildOutput = dotnet build $mockServerProject --configuration Release 2>&1 | Out-String
+        if ($LASTEXITCODE -ne 0) {
+            throw "Failed to build mock server (exit code $LASTEXITCODE): $buildOutput"
+        }
         $mockServerDll = $dllSearchPaths | Where-Object { Test-Path $_ } | Select-Object -First 1
         if (-not $mockServerDll) {
-            throw "Failed to build mock server: $buildOutput"
+            throw "Mock server build succeeded but DLL not found at expected paths: $($dllSearchPaths -join ', ')"
         }
     }