Enforce explicit test coverage thresholds in CI

scripts/check-coverage.ps1

@@ -0,0 +1,43 @@
+param(
+    [double]$MinLineRate = 0.90,
+    [double]$MinBranchRate = 0.70,
+    [string]$ResultsRoot = "GameList.Tests/TestResults"
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+if (-not (Test-Path $ResultsRoot)) {
+    throw "Coverage results folder not found: $ResultsRoot"
+}
+
+$coverageFile = Get-ChildItem -Path $ResultsRoot -Recurse -Filter "coverage.cobertura.xml" |
+    Sort-Object LastWriteTimeUtc -Descending |
+    Select-Object -First 1
+
+if ($null -eq $coverageFile) {
+    throw "No coverage.cobertura.xml found under $ResultsRoot"
+}
+
+[xml]$xml = Get-Content -Path $coverageFile.FullName
+$coverage = $xml.coverage
+
+if ($null -eq $coverage) {
+    throw "Coverage XML is missing root coverage node: $($coverageFile.FullName)"
+}
+
+[double]$lineRate = [double]$coverage.'line-rate'
+[double]$branchRate = [double]$coverage.'branch-rate'
+
+$linePercent = [Math]::Round($lineRate * 100, 2)
+$branchPercent = [Math]::Round($branchRate * 100, 2)
+$minLinePercent = [Math]::Round($MinLineRate * 100, 2)
+$minBranchPercent = [Math]::Round($MinBranchRate * 100, 2)
+
+Write-Host "Coverage source: $($coverageFile.FullName)"
+Write-Host ("Line coverage:   {0}% (required >= {1}%)" -f $linePercent, $minLinePercent)
+Write-Host ("Branch coverage: {0}% (required >= {1}%)" -f $branchPercent, $minBranchPercent)
+
+if ($lineRate -lt $MinLineRate -or $branchRate -lt $MinBranchRate) {
+    throw "Coverage thresholds failed."
+}

scripts/ci-local.ps1

@@ -53,13 +53,17 @@ try {
 
     Invoke-Step -Name "Run tests" -Action {
         if ($SkipBuild) {
-            dotnet test GameList.Tests/GameList.Tests.csproj --verbosity normal
+            dotnet test GameList.Tests/GameList.Tests.csproj --verbosity normal --collect:"XPlat Code Coverage"
         }
         else {
-            dotnet test GameList.Tests/GameList.Tests.csproj --no-build --verbosity normal
+            dotnet test GameList.Tests/GameList.Tests.csproj --no-build --verbosity normal --collect:"XPlat Code Coverage"
         }
     }
 
+    Invoke-Step -Name "Enforce coverage thresholds" -Action {
+        pwsh ./scripts/check-coverage.ps1 -MinLineRate 0.90 -MinBranchRate 0.70
+    }
+
     Write-Host "CI checks passed."
 }
 finally {