fix(backend): harden office-disabled cron, title limits, and dead-runtime cleanup (#2206)

apps/backend/internal/backendapp/httpserver_test.go

@@ -52,6 +52,21 @@ func freePort(t *testing.T) int {
 	return port
 }
 
+// requireLoopbackAlias skips the test when host cannot be bound. Linux treats
+// all of 127.0.0.0/8 as loopback, but macOS only configures 127.0.0.1 by
+// default, so multi-loopback binding tests are unrunnable there without an
+// explicit lo0 alias.
+func requireLoopbackAlias(t *testing.T, host string) {
+	t.Helper()
+	ln, err := net.Listen("tcp", net.JoinHostPort(host, "0"))
+	if err != nil {
+		t.Skipf("loopback alias %s not available on this host: %v", host, err)
+	}
+	if err := ln.Close(); err != nil {
+		t.Fatalf("close loopback probe listener: %v", err)
+	}
+}
+
 func noContentServer() *http.Server {
 	return &http.Server{
 		Handler: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
@@ -109,6 +124,7 @@ func shutdown(t *testing.T, listeners *serverListeners, server *http.Server) {
 }
 
 func TestStartHTTPServersMultipleLoopbackAddresses(t *testing.T) {
+	requireLoopbackAlias(t, "127.0.0.2")
 	log := testLogger(t)
 	port := freePort(t)
 	server := noContentServer()
@@ -152,6 +168,7 @@ func TestStartHTTPServersAllFailIsFatal(t *testing.T) {
 }
 
 func TestStartHTTPServersPartialFailSelfHeals(t *testing.T) {
+	requireLoopbackAlias(t, "127.0.0.2")
 	defer goleak.VerifyNone(t)
 
 	// Shorten the retry cadence for the test and restore it after.