feat(subscription): 有界队列执行维护并改进鉴权解析

backend/internal/service/subscription_maintenance_queue_test.go

@@ -0,0 +1,54 @@
+//go:build unit
+
+package service
+
+import (
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestSubscriptionMaintenanceQueue_TryEnqueue_QueueFull(t *testing.T) {
+	q := NewSubscriptionMaintenanceQueue(1, 1)
+	t.Cleanup(q.Stop)
+
+	block := make(chan struct{})
+	var started atomic.Int32
+
+	require.NoError(t, q.TryEnqueue(func() {
+		started.Store(1)
+		<-block
+	}))
+
+	// Wait until worker started consuming the first task.
+	require.Eventually(t, func() bool { return started.Load() == 1 }, time.Second, 10*time.Millisecond)
+
+	// Queue size is 1; with the worker blocked, enqueueing one more should fill it.
+	require.NoError(t, q.TryEnqueue(func() {}))
+
+	// Now the queue is full; next enqueue must fail.
+	err := q.TryEnqueue(func() {})
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "full")
+
+	close(block)
+}
+
+func TestSubscriptionMaintenanceQueue_TryEnqueue_PanicDoesNotKillWorker(t *testing.T) {
+	q := NewSubscriptionMaintenanceQueue(1, 8)
+	t.Cleanup(q.Stop)
+
+	require.NoError(t, q.TryEnqueue(func() { panic("boom") }))
+
+	done := make(chan struct{})
+	require.NoError(t, q.TryEnqueue(func() { close(done) }))
+
+	select {
+	case <-done:
+		// ok
+	case <-time.After(time.Second):
+		t.Fatalf("worker did not continue after panic")
+	}
+}