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diff --git a/src/mongo/db/vector_clock_mongod_test.cpp b/src/mongo/db/vector_clock_mongod_test.cpp
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+/**
+ *    Copyright (C) 2020-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/service_context_test_fixture.h"
+#include "mongo/db/vector_clock_mutable.h"
+#include "mongo/unittest/death_test.h"
+#include "mongo/unittest/unittest.h"
+
+namespace mongo {
+namespace {
+
+using VectorClockMongoDTest = ServiceContextTest;
+
+TEST_F(VectorClockMongoDTest, TickClusterTime) {
+    auto sc = getGlobalServiceContext();
+    auto vc = VectorClockMutable::get(sc);
+
+    const auto t0 = vc->getTime();
+    ASSERT_EQ(LogicalTime(), t0[VectorClock::Component::ClusterTime]);
+
+    const auto r1 = vc->tick(VectorClock::Component::ClusterTime, 1);
+    const auto t1 = vc->getTime();
+    ASSERT_EQ(r1, t1[VectorClock::Component::ClusterTime]);
+    ASSERT_GT(r1, t0[VectorClock::Component::ClusterTime]);
+
+    const auto r2 = vc->tick(VectorClock::Component::ClusterTime, 2);
+    const auto t2 = vc->getTime();
+    ASSERT_GT(r2, r1);
+    ASSERT_GT(t2[VectorClock::Component::ClusterTime], r1);
+}
+
+TEST_F(VectorClockMongoDTest, GossipOutTest) {
+    // TODO SERVER-47914: after ClusterTime gossiping has been re-enabled: get the gossipOut
+    // internal and external, and for each check that $clusterTime is there, with the right format,
+    // and right value, and not configTime.
+
+    // auto sc = getGlobalServiceContext();
+    // auto vc = VectorClockMutable::get(sc);
+
+    // const auto r1 = vc->tick(VectorClock::Component::ClusterTime, 1);
+}
+
+TEST_F(VectorClockMongoDTest, GossipInTest) {
+    // TODO SERVER-47914: after ClusterTime gossiping has been re-enabled: for each of gossipIn
+    // internal and external, give it BSON in the correct format, and then check that ClusterTime
+    // has been advanced (or not), and that ConfigTime has not.
+
+    // auto sc = getGlobalServiceContext();
+    // auto vc = VectorClockMutable::get(sc);
+
+    // const auto r1 = vc->tick(VectorClock::Component::ClusterTime, 1);
+}
+
+DEATH_TEST_F(VectorClockMongoDTest, CannotTickConfigTime, "Hit a MONGO_UNREACHABLE") {
+    auto sc = getGlobalServiceContext();
+    auto vc = VectorClockMutable::get(sc);
+    vc->tick(VectorClock::Component::ConfigTime, 1);
+}
+
+DEATH_TEST_F(VectorClockMongoDTest, CannotTickToClusterTime, "Hit a MONGO_UNREACHABLE") {
+    auto sc = getGlobalServiceContext();
+    auto vc = VectorClockMutable::get(sc);
+    vc->tickTo(VectorClock::Component::ClusterTime, LogicalTime());
+}
+
+DEATH_TEST_F(VectorClockMongoDTest, CannotTickToConfigTime, "Hit a MONGO_UNREACHABLE") {
+    auto sc = getGlobalServiceContext();
+    auto vc = VectorClockMutable::get(sc);
+    vc->tickTo(VectorClock::Component::ConfigTime, LogicalTime());
+}
+
+}  // namespace
+}  // namespace mongo