From 4097eb04e11693135bcd60e416f6bc38f2301262 Mon Sep 17 00:00:00 2001
From: Alexander Zalyalov <zalyalov@ydb.tech>
Date: Fri, 7 Nov 2025 15:30:30 +0000
Subject: [PATCH] test for invalid reassign

---
 ydb/core/mind/hive/hive_ut.cpp | 63 ++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/ydb/core/mind/hive/hive_ut.cpp b/ydb/core/mind/hive/hive_ut.cpp
index 3cf9b5f5e17d..44b194f0c302 100644
--- a/ydb/core/mind/hive/hive_ut.cpp
+++ b/ydb/core/mind/hive/hive_ut.cpp
@@ -8229,6 +8229,69 @@ Y_UNIT_TEST_SUITE(THiveTest) {
         }
     }
 
+    Y_UNIT_TEST(TestReassignNonexistentTablet) {
+        TTestBasicRuntime runtime(1, false);
+        Setup(runtime, true);
+
+        const ui64 hiveTablet = MakeDefaultHiveID();
+        const ui64 testerTablet = MakeTabletID(false, 1);
+        const TActorId hiveActor = CreateTestBootstrapper(runtime, CreateTestTabletInfo(hiveTablet, TTabletTypes::Hive), &CreateDefaultHive);
+        runtime.EnableScheduleForActor(hiveActor);
+        MakeSureTabletIsUp(runtime, hiveTablet, 0);
+        TActorId sender = runtime.AllocateEdgeActor(0);
+
+        {
+            TDispatchOptions options;
+            options.FinalEvents.emplace_back(TEvLocal::EvSyncTablets);
+            runtime.DispatchEvents(options);
+        }
+
+        THolder<TEvHive::TEvCreateTablet> createTablet = MakeHolder<TEvHive::TEvCreateTablet>(testerTablet, 1, TTabletTypes::Dummy, BINDED_CHANNELS);
+        ui64 tablet = SendCreateTestTablet(runtime, hiveTablet, testerTablet, std::move(createTablet), 0, true);
+
+        MakeSureTabletIsUp(runtime, tablet, 0);
+
+        {
+            NActorsProto::TRemoteHttpInfo pb;
+            pb.SetMethod(HTTP_METHOD_POST);
+            pb.SetPath("/app");
+            auto* p1 = pb.AddQueryParams();
+            p1->SetKey("TabletID");
+            p1->SetValue(TStringBuilder() << hiveTablet);
+            auto* p2 = pb.AddQueryParams();
+            p2->SetKey("page");
+            p2->SetValue("ReassignTablet");
+            auto* p3 = pb.AddQueryParams();
+            p3->SetKey("tablet");
+            p3->SetValue("52");
+            runtime.SendToPipe(hiveTablet, sender, new NMon::TEvRemoteHttpInfo(std::move(pb)), 0, GetPipeConfigWithRetries());
+
+            TAutoPtr<IEventHandle> handle;
+            auto resp = runtime.GrabEdgeEventRethrow<NMon::TEvRemoteJsonInfoRes>(handle);
+            Ctest << "Hive response: " << resp->Json << Endl;
+            NJson::TJsonValue value;
+            ReadJsonTree(resp->Json, &value, false);
+            UNIT_ASSERT_VALUES_EQUAL(value["total"].GetIntegerSafe(), 0);
+        }
+
+        // this must not block balancer
+
+       {
+            THolder<TEvHive::TEvTabletMetrics> metrics = MakeHolder<TEvHive::TEvTabletMetrics>();
+            NKikimrHive::TTabletMetrics* metric = metrics->Record.AddTabletMetrics();
+            metric->SetTabletID(tablet);
+            metric->MutableResourceUsage()->SetNetwork(9000);
+
+            runtime.SendToPipe(hiveTablet, sender, metrics.Release());
+       }
+
+       {
+           TDispatchOptions options;
+           options.FinalEvents.push_back(NHive::TEvPrivate::EvBalancerOut);
+           runtime.DispatchEvents(options);
+       }
+    }
+
     Y_UNIT_TEST(TestTabletsStartingCounter) {
       TTestBasicRuntime runtime(1, false);
       Setup(runtime, true);