chore: import upstream snapshot with attribution

dotnet/eng/scripts/dotnet-check-coverage.ps1

@@ -0,0 +1,82 @@
+param (
+    [string]$JsonReportPath,
+    [double]$CoverageThreshold
+)
+
+$jsonContent = Get-Content $JsonReportPath -Raw | ConvertFrom-Json
+$coverageBelowThreshold = $false
+
+$nonExperimentalAssemblies = [System.Collections.Generic.HashSet[string]]::new()
+
+$assembliesCollection = @(
+    'Microsoft.Agents.AI.Abstractions'
+    'Microsoft.Agents.AI'
+)
+
+foreach ($assembly in $assembliesCollection) {
+    $nonExperimentalAssemblies.Add($assembly)
+}
+
+function Get-FormattedValue {
+    param (
+        [float]$Coverage,
+        [bool]$UseIcon = $false
+    )
+    $formattedNumber = "{0:N1}" -f $Coverage
+    $icon = if (-not $UseIcon) { "" } elseif ($Coverage -ge $CoverageThreshold) { '✅' } else { '❌' }
+    
+    return "$formattedNumber% $icon"
+}
+
+$totallines = $jsonContent.summary.totallines
+$totalbranches = $jsonContent.summary.totalbranches
+$lineCoverage = $jsonContent.summary.linecoverage
+$branchCoverage = $jsonContent.summary.branchcoverage
+
+$totalTableData = [PSCustomObject]@{
+    'Metric'          = 'Total Coverage'
+    'Total Lines'     = $totallines
+    'Total Branches'  = $totalbranches
+    'Line Coverage'   = Get-FormattedValue -Coverage $lineCoverage
+    'Branch Coverage' = Get-FormattedValue -Coverage $branchCoverage
+}
+
+$totalTableData | Format-Table -AutoSize
+
+$assemblyTableData = @()
+
+foreach ($assembly in $jsonContent.coverage.assemblies) {
+    $assemblyName = $assembly.name
+    $assemblyTotallines = $assembly.totallines
+    $assemblyTotalbranches = $assembly.totalbranches
+    $assemblyLineCoverage = $assembly.coverage
+    $assemblyBranchCoverage = $assembly.branchcoverage
+    
+    $isNonExperimentalAssembly = $nonExperimentalAssemblies -contains $assemblyName
+
+    $lineCoverageFailed = $assemblyLineCoverage -lt $CoverageThreshold -and $assemblyTotallines -gt 0
+    $branchCoverageFailed = $assemblyBranchCoverage -lt $CoverageThreshold -and $assemblyTotalbranches -gt 0
+
+    if ($isNonExperimentalAssembly -and ($lineCoverageFailed -or $branchCoverageFailed)) {
+        $coverageBelowThreshold = $true
+    }
+
+    $assemblyTableData += [PSCustomObject]@{
+        'Assembly Name' = $assemblyName
+        'Total Lines'     = $assemblyTotallines
+        'Total Branches'  = $assemblyTotalbranches
+        'Line Coverage'   = Get-FormattedValue -Coverage $assemblyLineCoverage -UseIcon $isNonExperimentalAssembly
+        'Branch Coverage' = Get-FormattedValue -Coverage $assemblyBranchCoverage -UseIcon $isNonExperimentalAssembly
+    }
+}
+
+$sortedTable = $assemblyTableData | Sort-Object {
+    $nonExperimentalAssemblies -contains $_.'Assembly Name'
+} -Descending
+
+$sortedTable | Format-Table -AutoSize
+
+if ($coverageBelowThreshold) {
+    Write-Host "Code coverage is lower than defined threshold: $CoverageThreshold. Stopping the task."
+    exit 1
+}