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diff --git a/src/mongo/client/streamable_replica_set_monitor_discovery_time_processor_test.cpp b/src/mongo/client/streamable_replica_set_monitor_discovery_time_processor_test.cpp
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+++ b/src/mongo/client/streamable_replica_set_monitor_discovery_time_processor_test.cpp
@@ -0,0 +1,100 @@
+/**
+ *    Copyright (C) 2021-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 <boost/optional/optional_io.hpp>
+
+#include "mongo/client/sdam/sdam_test_base.h"
+#include "mongo/client/sdam/server_description_builder.h"
+#include "mongo/client/sdam/topology_description.h"
+#include "mongo/client/sdam/topology_manager.h"
+#include "mongo/client/streamable_replica_set_monitor_discovery_time_processor.h"
+
+namespace mongo {
+
+class PrimaryServerDiscoveryTime : public SdamTestFixture {
+public:
+    const SdamConfiguration sdamConfiguration;
+
+    PrimaryServerDiscoveryTime() : sdamConfiguration(SdamConfiguration({{HostAndPort("s0")}})) {}
+    static inline const OID kOidOne{"000000000000000000000001"};
+    SdamServerSelector selector = SdamServerSelector(sdamConfiguration);
+    StreamableReplicaSetMonitor::StreamableReplicaSetMonitorDiscoveryTimeProcessor
+        _rsmTimeProcessor;
+};
+TEST_F(PrimaryServerDiscoveryTime, ShouldFilterByLastWriteTime2) {
+    TopologyStateMachine stateMachine(sdamConfiguration);
+    auto topologyDescription = std::make_shared<TopologyDescription>(sdamConfiguration);
+
+    const auto s0 = ServerDescriptionBuilder()
+                        .withAddress(HostAndPort("s0"))
+                        .withType(ServerType::kRSPrimary)
+                        .withRtt(sdamConfiguration.getLocalThreshold())
+                        .withSetName("set")
+                        .withHost(HostAndPort("s0"))
+                        .withHost(HostAndPort("s1"))
+                        .withMinWireVersion(WireVersion::SUPPORTS_OP_MSG)
+                        .withMaxWireVersion(WireVersion::LATEST_WIRE_VERSION)
+                        .withElectionId(kOidOne)
+                        .withSetVersion(100)
+                        .instance();
+    stateMachine.onServerDescription(*topologyDescription, s0);
+
+    auto newTopology = TopologyDescription::clone(*topologyDescription);
+    const auto s1 = ServerDescriptionBuilder()
+                        .withAddress(HostAndPort("s0"))
+                        .withType(ServerType::kRSSecondary)
+                        .withRtt(sdamConfiguration.getLocalThreshold())
+                        .withSetName("set")
+                        .withHost(HostAndPort("s0"))
+                        .withHost(HostAndPort("s1"))
+                        .withMinWireVersion(WireVersion::SUPPORTS_OP_MSG)
+                        .withMaxWireVersion(WireVersion::LATEST_WIRE_VERSION)
+                        .withElectionId(kOidOne)
+                        .withSetVersion(100)
+                        .instance();
+
+    stateMachine.onServerDescription(*newTopology, s1);
+
+    // no timer reset because primary server didn't change
+    auto beforeElapsedDuration = _rsmTimeProcessor.getPrimaryServerChangeElapsedTime();
+    sleepFor(Milliseconds(100));
+    _rsmTimeProcessor.onTopologyDescriptionChangedEvent(topologyDescription, topologyDescription);
+    auto afterElapsedDuration = _rsmTimeProcessor.getPrimaryServerChangeElapsedTime();
+    ASSERT_TRUE(afterElapsedDuration > beforeElapsedDuration);
+
+    // timer reset because of primary server change
+    beforeElapsedDuration = _rsmTimeProcessor.getPrimaryServerChangeElapsedTime();
+    sleepFor(Milliseconds(100));
+    _rsmTimeProcessor.onTopologyDescriptionChangedEvent(topologyDescription, newTopology);
+    afterElapsedDuration = _rsmTimeProcessor.getPrimaryServerChangeElapsedTime();
+    ASSERT_TRUE(afterElapsedDuration <
+                beforeElapsedDuration);  // afterElapsedDuration was just reset
+}
+
+}  // namespace mongo