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diff --git a/src/mongo/db/transaction_reaper_d_test.cpp b/src/mongo/db/transaction_reaper_d_test.cpp
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+/**
+ *    Copyright (C) 2019-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/dbdirectclient.h"
+#include "mongo/db/repl/replication_coordinator_mock.h"
+#include "mongo/db/service_context_d_test_fixture.h"
+#include "mongo/db/session_txn_record_gen.h"
+#include "mongo/db/sessions_collection_mock.h"
+#include "mongo/db/transaction_reaper_d.h"
+#include "mongo/util/clock_source_mock.h"
+
+namespace mongo {
+namespace {
+
+class TransactionReaperTest : public ServiceContextMongoDTest {
+protected:
+    void setUp() override {
+        const auto service = getServiceContext();
+        auto replCoord = std::make_unique<repl::ReplicationCoordinatorMock>(service);
+        ASSERT_OK(replCoord->setFollowerMode(repl::MemberState::RS_PRIMARY));
+
+        repl::ReplicationCoordinator::set(service, std::move(replCoord));
+        service->setFastClockSource(std::make_unique<ClockSourceMock>());
+    }
+
+    ClockSourceMock* clock() {
+        return dynamic_cast<ClockSourceMock*>(getServiceContext()->getFastClockSource());
+    }
+
+    ServiceContext::UniqueOperationContext _uniqueOpCtx{makeOperationContext()};
+    OperationContext* _opCtx{_uniqueOpCtx.get()};
+
+    std::shared_ptr<MockSessionsCollectionImpl> _collectionMock{
+        std::make_shared<MockSessionsCollectionImpl>()};
+
+    std::shared_ptr<SessionsCollection> _collection{
+        std::make_shared<MockSessionsCollection>(_collectionMock)};
+};
+
+TEST_F(TransactionReaperTest, ReapSomeExpiredSomeNot) {
+    // Create some "old" sessions
+    DBDirectClient client(_opCtx);
+    SessionTxnRecord txn1(
+        makeLogicalSessionIdForTest(), 100, repl::OpTime(Timestamp(100), 1), clock()->now());
+    SessionTxnRecord txn2(
+        makeLogicalSessionIdForTest(), 200, repl::OpTime(Timestamp(200), 1), clock()->now());
+
+    client.insert(NamespaceString::kSessionTransactionsTableNamespace.ns(),
+                  std::vector{txn1.toBSON(), txn2.toBSON()});
+
+    // Add some "new" sessions to ensure they don't get reaped
+    clock()->advance(Minutes{31});
+    _collectionMock->add(LogicalSessionRecord(makeLogicalSessionIdForTest(), clock()->now()));
+    _collectionMock->add(LogicalSessionRecord(makeLogicalSessionIdForTest(), clock()->now()));
+
+
+    ASSERT_EQ(2,
+              TransactionReaperD::reapSessionsOlderThan(
+                  _opCtx, *_collection, clock()->now() - Minutes{30}));
+}
+
+}  // namespace
+}  // namespace mongo