diff --git a/velox/common/base/SpillConfig.cpp b/velox/common/base/SpillConfig.cpp
index ca52d79f63662..71188fc5c6dc0 100644
--- a/velox/common/base/SpillConfig.cpp
+++ b/velox/common/base/SpillConfig.cpp
@@ -33,7 +33,6 @@ SpillConfig::SpillConfig(
     int32_t _maxSpillLevel,
     uint64_t _maxSpillRunRows,
     uint64_t _writerFlushThresholdSize,
-    int32_t _testSpillPct,
     const std::string& _compressionKind,
     const std::string& _fileCreateConfig)
     : getSpillDirPathCb(std::move(_getSpillDirPathCb)),
@@ -52,7 +51,6 @@ SpillConfig::SpillConfig(
       maxSpillLevel(_maxSpillLevel),
       maxSpillRunRows(_maxSpillRunRows),
       writerFlushThresholdSize(_writerFlushThresholdSize),
-      testSpillPct(_testSpillPct),
       compressionKind(common::stringToCompressionKind(_compressionKind)),
       fileCreateConfig(_fileCreateConfig) {
   VELOX_USER_CHECK_GE(
diff --git a/velox/common/base/SpillConfig.h b/velox/common/base/SpillConfig.h
index 27ff401df40e8..e018f2ad2f0b7 100644
--- a/velox/common/base/SpillConfig.h
+++ b/velox/common/base/SpillConfig.h
@@ -60,7 +60,6 @@ struct SpillConfig {
       int32_t _maxSpillLevel,
       uint64_t _maxSpillRunRows,
       uint64_t _writerFlushThresholdSize,
-      int32_t _testSpillPct,
       const std::string& _compressionKind,
       const std::string& _fileCreateConfig = {});
 
@@ -137,10 +136,6 @@ struct SpillConfig {
   /// writer by flushing its buffered data to disk.
   uint64_t writerFlushThresholdSize;
 
-  /// Percentage of input batches to be spilled for testing. 0 means no
-  /// spilling for test.
-  int32_t testSpillPct;
-
   /// CompressionKind when spilling, CompressionKind_NONE means no compression.
   common::CompressionKind compressionKind;
 
diff --git a/velox/common/base/tests/SpillConfigTest.cpp b/velox/common/base/tests/SpillConfigTest.cpp
index 501634c2c1d7b..11b1f42748560 100644
--- a/velox/common/base/tests/SpillConfigTest.cpp
+++ b/velox/common/base/tests/SpillConfigTest.cpp
@@ -40,7 +40,6 @@ TEST(SpillConfig, spillLevel) {
       0,
       0,
       0,
-      0,
       "none");
   struct {
     uint8_t bitOffset;
@@ -127,7 +126,6 @@ TEST(SpillConfig, spillLevelLimit) {
         testData.maxSpillLevel,
         0,
         0,
-        0,
         "none");
 
     ASSERT_EQ(
@@ -175,7 +173,6 @@ TEST(SpillConfig, spillableReservationPercentages) {
           0,
           1'000'000,
           0,
-          0,
           "none");
     };
 
diff --git a/velox/connectors/hive/tests/HiveDataSinkTest.cpp b/velox/connectors/hive/tests/HiveDataSinkTest.cpp
index 426d93f51b9c2..12515f2de9983 100644
--- a/velox/connectors/hive/tests/HiveDataSinkTest.cpp
+++ b/velox/connectors/hive/tests/HiveDataSinkTest.cpp
@@ -98,7 +98,6 @@ class HiveDataSinkTest : public exec::test::HiveConnectorTestBase {
         0,
         0,
         writerFlushThreshold,
-        0,
         "none");
   }
 
diff --git a/velox/core/QueryConfig.h b/velox/core/QueryConfig.h
index 39bf52cfdab92..9597ec273cd8b 100644
--- a/velox/core/QueryConfig.h
+++ b/velox/core/QueryConfig.h
@@ -230,8 +230,6 @@ class QueryConfig {
   /// value is set to 100 GB.
   static constexpr const char* kMaxSpillBytes = "max_spill_bytes";
 
-  static constexpr const char* kTestingSpillPct = "testing.spill_pct";
-
   /// The max allowed spilling level with zero being the initial spilling level.
   /// This only applies for hash build spilling which might trigger recursive
   /// spilling when the build table is too big. If it is set to -1, then there
@@ -563,12 +561,6 @@ class QueryConfig {
     return get<bool>(kTopNRowNumberSpillEnabled, true);
   }
 
-  /// Returns a percentage of aggregation or join input batches that will be
-  /// forced to spill for testing. 0 means no extra spilling.
-  int32_t testingSpillPct() const {
-    return get<int32_t>(kTestingSpillPct, 0);
-  }
-
   int32_t maxSpillLevel() const {
     return get<int32_t>(kMaxSpillLevel, 4);
   }
diff --git a/velox/dwio/dwrf/test/E2EWriterTest.cpp b/velox/dwio/dwrf/test/E2EWriterTest.cpp
index 54ff2c723e2a3..f23a1d77c2d86 100644
--- a/velox/dwio/dwrf/test/E2EWriterTest.cpp
+++ b/velox/dwio/dwrf/test/E2EWriterTest.cpp
@@ -258,7 +258,6 @@ class E2EWriterTest : public testing::Test {
         0,
         0,
         writerFlushThresholdSize,
-        0,
         "none");
   }
 
diff --git a/velox/exec/Driver.cpp b/velox/exec/Driver.cpp
index 551ac2131a95b..e37022f97ff6e 100644
--- a/velox/exec/Driver.cpp
+++ b/velox/exec/Driver.cpp
@@ -159,7 +159,6 @@ std::optional<common::SpillConfig> DriverCtx::makeSpillConfig(
       queryConfig.maxSpillLevel(),
       queryConfig.maxSpillRunRows(),
       queryConfig.writerFlushThresholdBytes(),
-      queryConfig.testingSpillPct(),
       queryConfig.spillCompressionKind(),
       queryConfig.spillFileCreateConfig());
 }
diff --git a/velox/exec/GroupingSet.cpp b/velox/exec/GroupingSet.cpp
index 63035396ddd0f..0af733800e627 100644
--- a/velox/exec/GroupingSet.cpp
+++ b/velox/exec/GroupingSet.cpp
@@ -823,9 +823,7 @@ void GroupingSet::ensureInputFits(const RowVectorPtr& input) {
   const int64_t flatBytes = input->estimateFlatSize();
 
   // Test-only spill path.
-  if (spillConfig_->testSpillPct > 0 &&
-      (folly::hasher<uint64_t>()(++spillTestCounter_)) % 100 <=
-          spillConfig_->testSpillPct) {
+  if (testingTriggerSpill()) {
     spill();
     return;
   }
@@ -895,9 +893,7 @@ void GroupingSet::ensureOutputFits() {
   }
 
   // Test-only spill path.
-  if (spillConfig_->testSpillPct > 0 &&
-      (folly::hasher<uint64_t>()(++spillTestCounter_)) % 100 <=
-          spillConfig_->testSpillPct) {
+  if (testingTriggerSpill()) {
     spill(RowContainerIterator{});
     return;
   }
diff --git a/velox/exec/GroupingSet.h b/velox/exec/GroupingSet.h
index 40b4d9296afbf..db42f6f4190af 100644
--- a/velox/exec/GroupingSet.h
+++ b/velox/exec/GroupingSet.h
@@ -348,10 +348,6 @@ class GroupingSet {
   // Pool of the OperatorCtx. Used for spilling.
   memory::MemoryPool& pool_;
 
-  // Counts input batches and triggers spilling if folly hash of this % 100 <=
-  // 'spillConfig_->testSpillPct'.
-  uint64_t spillTestCounter_{0};
-
   // True if partial aggregation has been given up as non-productive.
   bool abandonedPartialAggregation_{false};
 
diff --git a/velox/exec/fuzzer/AggregationFuzzerBase.cpp b/velox/exec/fuzzer/AggregationFuzzerBase.cpp
index 04d9249822972..260eaf4e7953d 100644
--- a/velox/exec/fuzzer/AggregationFuzzerBase.cpp
+++ b/velox/exec/fuzzer/AggregationFuzzerBase.cpp
@@ -373,12 +373,13 @@ velox::test::ResultOrError AggregationFuzzerBase::execute(
 
     builder.configs(queryConfigs_);
 
+    int32_t spillPct{0};
     if (injectSpill) {
       spillDirectory = exec::test::TempDirectoryPath::create();
       builder.spillDirectory(spillDirectory->path)
           .config(core::QueryConfig::kSpillEnabled, "true")
-          .config(core::QueryConfig::kAggregationSpillEnabled, "true")
-          .config(core::QueryConfig::kTestingSpillPct, "100");
+          .config(core::QueryConfig::kAggregationSpillEnabled, "true");
+      spillPct = 100;
     }
 
     if (abandonPartial) {
@@ -392,6 +393,7 @@ velox::test::ResultOrError AggregationFuzzerBase::execute(
       builder.splits(splits);
     }
 
+    TestScopedSpillInjection scopedSpillInjection(spillPct);
     resultOrError.result =
         builder.maxDrivers(maxDrivers).copyResults(pool_.get());
   } catch (VeloxUserError& e) {
diff --git a/velox/exec/tests/AggregationTest.cpp b/velox/exec/tests/AggregationTest.cpp
index 56ec6f3b3fe4a..05406c2ebd662 100644
--- a/velox/exec/tests/AggregationTest.cpp
+++ b/velox/exec/tests/AggregationTest.cpp
@@ -1650,12 +1650,12 @@ TEST_F(AggregationTest, spillDuringOutputProcessing) {
   const int numOutputRows = 5;
   auto tempDirectory = exec::test::TempDirectoryPath::create();
   core::PlanNodeId aggrNodeId;
+  TestScopedSpillInjection scopedSpillInjection(100);
   auto task =
       AssertQueryBuilder(duckDbQueryRunner_)
           .spillDirectory(tempDirectory->path)
           .config(QueryConfig::kSpillEnabled, true)
           .config(QueryConfig::kAggregationSpillEnabled, true)
-          .config(QueryConfig::kTestingSpillPct, "100")
           // Set very large output buffer size, the number of output rows is
           // effectively controlled by 'kPreferredOutputBatchBytes'.
           .config(
@@ -1818,11 +1818,11 @@ TEST_F(AggregationTest, distinctWithSpilling) {
   createDuckDbTable(vectors);
   auto spillDirectory = exec::test::TempDirectoryPath::create();
   core::PlanNodeId aggrNodeId;
+  TestScopedSpillInjection scopedSpillInjection(100);
   auto task = AssertQueryBuilder(duckDbQueryRunner_)
                   .spillDirectory(spillDirectory->path)
                   .config(QueryConfig::kSpillEnabled, true)
                   .config(QueryConfig::kAggregationSpillEnabled, true)
-                  .config(QueryConfig::kTestingSpillPct, "100")
                   .plan(PlanBuilder()
                             .values(vectors)
                             .singleAggregation({"c0"}, {}, {})
@@ -1841,12 +1841,12 @@ TEST_F(AggregationTest, spillingForAggrsWithDistinct) {
   createDuckDbTable(vectors);
   auto spillDirectory = exec::test::TempDirectoryPath::create();
   core::PlanNodeId aggrNodeId;
+  TestScopedSpillInjection scopedSpillInjection(100);
   auto task =
       AssertQueryBuilder(duckDbQueryRunner_)
           .spillDirectory(spillDirectory->path)
           .config(QueryConfig::kSpillEnabled, true)
           .config(QueryConfig::kAggregationSpillEnabled, true)
-          .config(QueryConfig::kTestingSpillPct, "100")
           .plan(PlanBuilder()
                     .values(vectors)
                     .singleAggregation({"c1"}, {"count(DISTINCT c0)"}, {})
@@ -1857,7 +1857,6 @@ TEST_F(AggregationTest, spillingForAggrsWithDistinct) {
   const auto& queryConfig = task->queryCtx()->queryConfig();
   ASSERT_TRUE(queryConfig.spillEnabled());
   ASSERT_TRUE(queryConfig.aggregationSpillEnabled());
-  ASSERT_EQ(100, queryConfig.testingSpillPct());
   ASSERT_EQ(toPlanStats(task->taskStats()).at(aggrNodeId).spilledBytes, 0);
   OperatorTestBase::deleteTaskAndCheckSpillDirectory(task);
 }
@@ -1871,11 +1870,11 @@ TEST_F(AggregationTest, spillingForAggrsWithSorting) {
 
   auto testPlan = [&](const core::PlanNodePtr& plan, const std::string& sql) {
     SCOPED_TRACE(sql);
+    TestScopedSpillInjection scopedSpillInjection(100);
     auto task = AssertQueryBuilder(duckDbQueryRunner_)
                     .spillDirectory(spillDirectory->path)
                     .config(QueryConfig::kSpillEnabled, true)
                     .config(QueryConfig::kAggregationSpillEnabled, true)
-                    .config(QueryConfig::kTestingSpillPct, "100")
                     .plan(plan)
                     .assertResults(sql);
 
@@ -1970,12 +1969,12 @@ TEST_F(AggregationTest, preGroupedAggregationWithSpilling) {
   createDuckDbTable(vectors);
   auto spillDirectory = exec::test::TempDirectoryPath::create();
   core::PlanNodeId aggrNodeId;
+  TestScopedSpillInjection scopedSpillInjection(100);
   auto task =
       AssertQueryBuilder(duckDbQueryRunner_)
           .spillDirectory(spillDirectory->path)
           .config(QueryConfig::kSpillEnabled, true)
           .config(QueryConfig::kAggregationSpillEnabled, true)
-          .config(QueryConfig::kTestingSpillPct, "100")
           .plan(PlanBuilder()
                     .values(vectors)
                     .aggregation(
diff --git a/velox/exec/tests/SortBufferTest.cpp b/velox/exec/tests/SortBufferTest.cpp
index 3f35d456f7e51..df4209bafa74d 100644
--- a/velox/exec/tests/SortBufferTest.cpp
+++ b/velox/exec/tests/SortBufferTest.cpp
@@ -58,7 +58,6 @@ class SortBufferTest : public OperatorTestBase {
         0,
         0,
         0,
-        0,
         "none");
   }
 
@@ -301,7 +300,6 @@ TEST_F(SortBufferTest, batchOutput) {
         0,
         0,
         0,
-        100, //  testSpillPct
         "none");
     auto sortBuffer = std::make_unique<SortBuffer>(
         inputType_,
@@ -399,7 +397,6 @@ TEST_F(SortBufferTest, spill) {
         0,
         0,
         0,
-        0,
         "none");
     auto sortBuffer = std::make_unique<SortBuffer>(
         inputType_,
diff --git a/velox/exec/tests/TableWriteTest.cpp b/velox/exec/tests/TableWriteTest.cpp
index 6c63c897f8df6..09af603cb0680 100644
--- a/velox/exec/tests/TableWriteTest.cpp
+++ b/velox/exec/tests/TableWriteTest.cpp
@@ -346,6 +346,7 @@ class TableWriteTest : public HiveConnectorTestBase {
     }
 
     const auto spillDirectory = exec::test::TempDirectoryPath::create();
+    TestScopedSpillInjection scopedSpillInjection(100);
     return AssertQueryBuilder(plan, duckDbQueryRunner_)
         .spillDirectory(spillDirectory->path)
         .maxDrivers(
@@ -357,7 +358,6 @@ class TableWriteTest : public HiveConnectorTestBase {
             std::to_string(numPartitionedTableWriterCount_))
         .config(core::QueryConfig::kSpillEnabled, "true")
         .config(QueryConfig::kWriterSpillEnabled, "true")
-        .config(QueryConfig::kTestingSpillPct, "100")
         .copyResults(pool());
   }
 
diff --git a/velox/exec/tests/TaskTest.cpp b/velox/exec/tests/TaskTest.cpp
index 32398da7abf6c..2d602352b82ec 100644
--- a/velox/exec/tests/TaskTest.cpp
+++ b/velox/exec/tests/TaskTest.cpp
@@ -1383,8 +1383,7 @@ TEST_F(TaskTest, spillDirectoryLifecycleManagement) {
   params.queryCtx = std::make_shared<core::QueryCtx>(driverExecutor_.get());
   params.queryCtx->testingOverrideConfigUnsafe(
       {{core::QueryConfig::kSpillEnabled, "true"},
-       {core::QueryConfig::kAggregationSpillEnabled, "true"},
-       {core::QueryConfig::kTestingSpillPct, "100"}});
+       {core::QueryConfig::kAggregationSpillEnabled, "true"}});
   params.maxDrivers = 1;
 
   auto cursor = TaskCursor::create(params);
@@ -1394,6 +1393,7 @@ TEST_F(TaskTest, spillDirectoryLifecycleManagement) {
       rootTempDir->path + "/spillDirectoryLifecycleManagement";
   task->setSpillDirectory(tmpDirectoryPath, false);
 
+  TestScopedSpillInjection scopedSpillInjection(100);
   while (cursor->moveNext()) {
   }
   ASSERT_TRUE(waitForTaskCompletion(task.get(), 5'000'000));
diff --git a/velox/functions/lib/aggregates/tests/utils/AggregationTestBase.cpp b/velox/functions/lib/aggregates/tests/utils/AggregationTestBase.cpp
index 178ac443fea17..01f72fc092146 100644
--- a/velox/functions/lib/aggregates/tests/utils/AggregationTestBase.cpp
+++ b/velox/functions/lib/aggregates/tests/utils/AggregationTestBase.cpp
@@ -24,6 +24,7 @@
 #include "velox/dwio/dwrf/writer/Writer.h"
 #include "velox/exec/AggregateCompanionSignatures.h"
 #include "velox/exec/PlanNodeStats.h"
+#include "velox/exec/Spill.h"
 #include "velox/exec/tests/utils/TempDirectoryPath.h"
 #include "velox/exec/tests/utils/TempFilePath.h"
 #include "velox/expression/Expr.h"
@@ -376,12 +377,12 @@ void AggregationTestBase::testAggregationsWithCompanion(
 
     AssertQueryBuilder queryBuilder(builder.planNode(), duckDbQueryRunner_);
     queryBuilder.configs(config)
-        .config(core::QueryConfig::kTestingSpillPct, 100)
         .config(core::QueryConfig::kSpillEnabled, true)
         .config(core::QueryConfig::kAggregationSpillEnabled, true)
         .spillDirectory(spillDirectory->path)
         .maxDrivers(4);
 
+    exec::TestScopedSpillInjection scopedSpillInjection(100);
     auto task = assertResults(queryBuilder);
 
     // Expect > 0 spilled bytes unless there was no input.
@@ -785,12 +786,12 @@ void AggregationTestBase::testAggregationsImpl(
         memory::spillMemoryPool()->stats().peakBytes;
     AssertQueryBuilder queryBuilder(builder.planNode(), duckDbQueryRunner_);
     queryBuilder.configs(config)
-        .config(core::QueryConfig::kTestingSpillPct, 100)
         .config(core::QueryConfig::kSpillEnabled, true)
         .config(core::QueryConfig::kAggregationSpillEnabled, true)
         .spillDirectory(spillDirectory->path)
         .maxDrivers(4);
 
+    exec::TestScopedSpillInjection scopedSpillInjection(100);
     auto task = assertResults(queryBuilder);
 
     // Expect > 0 spilled bytes unless there was no input.
@@ -871,11 +872,12 @@ void AggregationTestBase::testAggregationsImpl(
     auto spillDirectory = exec::test::TempDirectoryPath::create();
 
     AssertQueryBuilder queryBuilder(builder.planNode(), duckDbQueryRunner_);
-    queryBuilder.configs(config).config(core::QueryConfig::kTestingSpillPct, "100")
+    queryBuilder.configs(config)
         .config(core::QueryConfig::kSpillEnabled, "true")
         .config(core::QueryConfig::kAggregationSpillEnabled, "true")
         .spillDirectory(spillDirectory->path);
 
+    TestScopedSpillInjection scopedSpillInjection(100);
     auto task = assertResults(queryBuilder);
 
     // Expect > 0 spilled bytes unless there was no input.
diff --git a/velox/functions/sparksql/aggregates/tests/FirstAggregateTest.cpp b/velox/functions/sparksql/aggregates/tests/FirstAggregateTest.cpp
index 63ccc85d3b2d7..6792dec1537c0 100644
--- a/velox/functions/sparksql/aggregates/tests/FirstAggregateTest.cpp
+++ b/velox/functions/sparksql/aggregates/tests/FirstAggregateTest.cpp
@@ -590,8 +590,8 @@ TEST_F(FirstAggregateTest, spillingAndSorting) {
 
   auto spillDirectory = exec::test::TempDirectoryPath::create();
 
+  exec::TestScopedSpillInjection scopedSpillInjection(100);
   results = AssertQueryBuilder(plan)
-                .config(core::QueryConfig::kTestingSpillPct, "100")
                 .config(core::QueryConfig::kSpillEnabled, "true")
                 .config(core::QueryConfig::kAggregationSpillEnabled, "true")
                 .spillDirectory(spillDirectory->path)