test(admin): cover pools list response serialization (#2862)

Signed-off-by: houseme <housemecn@gmail.com>
Co-authored-by: houseme <housemecn@gmail.com>

rustfs/src/app/admin_usecase.rs

@@ -647,6 +647,33 @@ mod tests {
         assert_eq!(item.status, "active");
     }
 
+    #[test]
+    fn admin_pool_list_item_serializes_admin_api_fields() {
+        let item = DefaultAdminUsecase::pool_list_item_from_status(PoolStatus {
+            id: 1,
+            cmd_line: "pool-1".to_string(),
+            last_update: OffsetDateTime::UNIX_EPOCH,
+            decommission: None,
+        });
+
+        let value = serde_json::to_value(item).unwrap();
+
+        assert_eq!(
+            value,
+            serde_json::json!({
+                "id": 1,
+                "cmdline": "pool-1",
+                "lastUpdate": "1970-01-01T00:00:00Z",
+                "totalSize": 0,
+                "currentSize": 0,
+                "usedSize": 0,
+                "used": 0.0,
+                "status": "active",
+                "decommissionInfo": null
+            })
+        );
+    }
+
     #[test]
     fn admin_pool_list_item_saturates_used_size_when_current_exceeds_total() {
         let pool = PoolStatus {