added the smoke-test.ps1 and tested it

scripts/smoke-test.ps1

@@ -0,0 +1,159 @@
+param(
+    [string]$BaseUrl = $env:TRAFFIC_CONTROL_BASE_URL
+)
+
+$ErrorActionPreference = "Stop"
+
+if ([string]::IsNullOrWhiteSpace($BaseUrl)) {
+    $BaseUrl = "http://localhost:8081"
+}
+
+$BaseUrl = $BaseUrl.TrimEnd("/")
+
+function Fail-SmokeTest {
+    param([string]$Message)
+
+    Write-Host "[FAIL] $Message" -ForegroundColor Red
+    exit 1
+}
+
+function Invoke-SmokeRequest {
+    param(
+        [string]$Name,
+        [string]$Uri,
+        [string]$Method,
+        [string]$Body
+    )
+
+    try {
+        $requestParams = @{
+            Uri             = $Uri
+            Method          = $Method
+            TimeoutSec      = 10
+            ErrorAction     = "Stop"
+            UseBasicParsing = $true
+        }
+
+        if ($Method -eq "POST") {
+            $requestParams["ContentType"] = "application/json"
+            $requestParams["Body"] = $Body
+        }
+
+        $response = Invoke-WebRequest @requestParams
+        $statusCode = [int]$response.StatusCode
+        $content = $response.Content
+
+        # Handle byte-array response content in Windows PowerShell 5.1.
+        if ($content -is [byte[]]) {
+            $content = [System.Text.Encoding]::UTF8.GetString($content)
+        }
+        else {
+            $content = [string]$content
+        }
+    }
+    catch {
+        $statusCode = $null
+
+        if ($_.Exception.Response) {
+            try {
+                $statusCode = [int]$_.Exception.Response.StatusCode
+            }
+            catch {
+                $statusCode = $null
+            }
+        }
+
+        if ($null -ne $statusCode) {
+            Fail-SmokeTest "$Name returned HTTP $statusCode."
+        }
+
+        Fail-SmokeTest "$Name failed: $($_.Exception.Message)"
+    }
+
+    if ($statusCode -ne 200) {
+        Fail-SmokeTest "$Name returned HTTP $statusCode."
+    }
+
+    Write-Host "[PASS] $Name returned HTTP 200." -ForegroundColor Green
+
+    return $content
+}
+
+Write-Host ""
+Write-Host "Traffic Control Deployment Smoke Test" -ForegroundColor Cyan
+Write-Host "Target: $BaseUrl"
+Write-Host ""
+
+# 1. Check gateway health.
+$healthContent = Invoke-SmokeRequest `
+    -Name "Gateway health check" `
+    -Uri "$BaseUrl/actuator/health" `
+    -Method "GET" `
+    -Body ""
+
+try {
+    $healthBody = $healthContent | ConvertFrom-Json -ErrorAction Stop
+}
+catch {
+    Fail-SmokeTest "Health endpoint returned invalid JSON: $healthContent"
+}
+
+if ($healthBody.status -ne "UP") {
+    Fail-SmokeTest "Expected health status UP, received '$($healthBody.status)'."
+}
+
+Write-Host "[PASS] Gateway reports status UP." -ForegroundColor Green
+
+# 2. Submit a representative traffic-evaluation request.
+$request = @{
+    requestId = "smoke-test-$([guid]::NewGuid().ToString())"
+    subject = @{
+        subjectId = "smoke-test-user"
+        type = "USER"
+    }
+    resource = "/api/smoke-test"
+    requestedAt = [DateTime]::UtcNow.ToString("yyyy-MM-ddTHH:mm:ss.fffZ")
+} | ConvertTo-Json -Depth 5 -Compress
+
+$resultContent = Invoke-SmokeRequest `
+    -Name "Traffic evaluation" `
+    -Uri "$BaseUrl/api/v1/traffic/evaluate" `
+    -Method "POST" `
+    -Body $request
+
+try {
+    $decision = $resultContent | ConvertFrom-Json -ErrorAction Stop
+}
+catch {
+    Fail-SmokeTest "Traffic evaluation returned invalid JSON: $resultContent"
+}
+
+# 3. Validate the response contract.
+if ($decision.status -notin @("ALLOWED", "REJECTED")) {
+    Fail-SmokeTest "Unexpected or missing decision status."
+}
+
+if ([string]::IsNullOrWhiteSpace([string]$decision.reason)) {
+    Fail-SmokeTest "Response is missing the reason field."
+}
+
+$remainingCapacity = 0L
+
+if (
+    $null -eq $decision.remainingCapacity -or
+    -not [long]::TryParse(
+        [string]$decision.remainingCapacity,
+        [ref]$remainingCapacity
+    ) -or
+    $remainingCapacity -lt 0
+) {
+    Fail-SmokeTest "remainingCapacity must be a non-negative integer."
+}
+
+Write-Host "[PASS] Decision status: $($decision.status)" -ForegroundColor Green
+Write-Host "[PASS] Response payload validated." -ForegroundColor Green
+
+Write-Host ""
+Write-Host "Smoke test completed successfully." -ForegroundColor Green
+
+exit 0