优化结构

internal/integration/cache/cache_test.go

@@ -40,3 +40,18 @@ func TestStoreIncrementRecreatesExpiredKeyWithoutStaleExpiry(t *testing.T) {
 		t.Fatalf("Get() after recreation = %q, %v, %v", value, ok, err)
 	}
 }
+
+func TestStoreIncrementAddsTTLToExistingPersistentCounter(t *testing.T) {
+	store := New(nil)
+	ctx := context.Background()
+	if err := store.Set(ctx, "counter", "5", 0); err != nil {
+		t.Fatal(err)
+	}
+	if value, err := store.Increment(ctx, "counter", time.Millisecond); err != nil || value != 6 {
+		t.Fatalf("Increment() = %d, %v", value, err)
+	}
+	time.Sleep(5 * time.Millisecond)
+	if _, ok, err := store.Get(ctx, "counter"); err != nil || ok {
+		t.Fatalf("persistent counter did not expire: ok=%v err=%v", ok, err)
+	}
+}