From f1e5fc296166b651d3db28f285cdc98fe3b21bfa Mon Sep 17 00:00:00 2001
From: Irene Skvortsova <nerhneiro@gmail.com>
Date: Thu, 25 Sep 2025 19:24:13 +0300
Subject: Add test on supportive partitions deletion for expired transactions
 (#25807)

Co-authored-by: Irina Skvortsova <nerhneiro@yandex-team.ru>
---
 ydb/core/persqueue/ut/pqtablet_ut.cpp | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/ydb/core/persqueue/ut/pqtablet_ut.cpp b/ydb/core/persqueue/ut/pqtablet_ut.cpp
index d3526699d4d..8ec2d433642 100644
--- a/ydb/core/persqueue/ut/pqtablet_ut.cpp
+++ b/ydb/core/persqueue/ut/pqtablet_ut.cpp
@@ -2495,6 +2495,41 @@ Y_UNIT_TEST_F(Kafka_Transaction_Supportive_Partitions_Should_Be_Deleted_After_Ti
 
     // wait till supportive partition for this kafka transaction is deleted
     WaitForExactSupportivePartitionsCount(0);
+}
+
+Y_UNIT_TEST_F(Kafka_Transaction_Supportive_Partitions_Should_Be_Deleted_With_Delete_Partition_Done_Event_Drop, TPQTabletFixture)
+{
+    NKafka::TProducerInstanceId producerInstanceId = {1, 0};
+    PQTabletPrepare({.partitions=1}, {}, *Ctx);
+    EnsurePipeExist();
+    TString ownerCookie = CreateSupportivePartitionForKafka(producerInstanceId);
+
+    // send data to create blobs for supportive partitions
+    SendKafkaTxnWriteRequest(producerInstanceId, ownerCookie);
+
+    // validate supportive partition was created
+    WaitForExactSupportivePartitionsCount(1);
+    auto txInfo = GetTxWritesFromKV();
+    UNIT_ASSERT_VALUES_EQUAL(txInfo.TxWritesSize(), 1);
+    UNIT_ASSERT_VALUES_EQUAL(txInfo.GetTxWrites(0).GetKafkaTransaction(), true);
+
+    // increment time till after kafka txn timeout
+    ui64 kafkaTxnTimeoutMs = Ctx->Runtime->GetAppData(0).KafkaProxyConfig.GetTransactionTimeoutMs()
+        + KAFKA_TRANSACTION_DELETE_DELAY_MS;
+    Ctx->Runtime->AdvanceCurrentTime(TDuration::MilliSeconds(kafkaTxnTimeoutMs + 1));
+    SendToPipe(Ctx->Edge, MakeHolder<TEvents::TEvWakeup>().Release());
+    TAutoPtr<TEvPQ::TEvDeletePartitionDone> deleteDoneEvent;
+    bool seenEvent = false;
+    // add observer for TEvPQ::TEvDeletePartitionDone request and skip it
+    AddOneTimeEventObserver<TEvPQ::TEvDeletePartitionDone>(seenEvent, 1, [](TAutoPtr<IEventHandle>&) {
+        return TTestActorRuntimeBase::EEventAction::DROP;
+    });
+    TDispatchOptions options;
+    options.CustomFinalCondition = [&seenEvent]() {return seenEvent;};
+    UNIT_ASSERT(Ctx->Runtime->DispatchEvents(options));
+    PQTabletRestart(*Ctx);
+    ResetPipe();
+    // check that that our expired transaction has been deleted
     WaitForExactTxWritesCount(0);
 }
 
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