test: add haproxy smoke test

Assisted-by: GLM 5 via Claude Code
Signed-off-by: Xe Iaso <me@xeiaso.net>

test/haproxy-simple/test.mjs

@@ -0,0 +1,39 @@
+#!/usr/bin/env node
+
+async function main() {
+  console.log("Starting HAProxy simple smoke test...");
+
+  console.log("trying to hit backend through haproxy");
+  let resp = await fetch(
+    "https://localhost:8443",
+    {
+      headers: {
+        "User-Agent": "Anubis testing",
+      }
+    }
+  );
+
+  if (resp.status !== 200) {
+    throw new Error(`Expected 200, got ${resp.status}`);
+  }
+  console.log("Got 200 as expected");
+
+  console.log("trying to get stopped by anubis");
+  resp = await fetch(
+    "https://localhost:8443",
+    {
+      headers: {
+        "User-Agent": "Mozilla/5.0",
+      }
+    }
+  );
+
+  if (resp.status !== 401) {
+    throw new Error(`Expected 401, got ${resp.status}`);
+  }
+  console.log("Got 401 as expected");
+
+  console.log("All runtime tests passed successfully!");
+}
+
+await main();