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diff --git a/src/mongo/s/commands/compute_at_cluster_time_test.cpp b/src/mongo/s/commands/compute_at_cluster_time_test.cpp
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+++ b/src/mongo/s/commands/compute_at_cluster_time_test.cpp
@@ -0,0 +1,103 @@
+/**
+ * Copyright (C) 2018 MongoDB Inc.
+ *
+ * This program is free software: you can redistribute it and/or  modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * 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 GNU Affero General 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/client/remote_command_targeter_mock.h"
+#include "mongo/db/logical_time.h"
+#include "mongo/s/client/shard_remote.h"
+#include "mongo/s/commands/cluster_commands_helpers.h"
+#include "mongo/s/shard_id.h"
+#include "mongo/s/sharding_router_test_fixture.h"
+#include "mongo/unittest/unittest.h"
+
+namespace mongo {
+namespace {
+
+const HostAndPort kTestConfigShardHost = HostAndPort("FakeConfigHost", 12345);
+
+const ShardId shardOneId("shardOne");
+const HostAndPort shardOne("shardOne:1234");
+
+const ShardId shardTwoId("shardTwo");
+const HostAndPort shardTwo("shardTwo:1234");
+
+class AtClusterTimeTest : public ShardingTestFixture {
+protected:
+    void setUp() {
+        ShardingTestFixture::setUp();
+        configTargeter()->setFindHostReturnValue(kTestConfigShardHost);
+        std::vector<std::tuple<ShardId, HostAndPort>> shardInfos;
+        shardInfos.push_back(std::make_tuple(shardOneId, shardOne));
+        shardInfos.push_back(std::make_tuple(shardTwoId, shardTwo));
+
+        ShardingTestFixture::addRemoteShards(shardInfos);
+    }
+};
+
+TEST_F(AtClusterTimeTest, ComputeValidValid) {
+    auto shardOne = shardRegistry()->getShardNoReload(shardOneId);
+    LogicalTime timeOne(Timestamp(10, 2));
+    shardOne->updateLastCommittedOpTime(timeOne);
+    ASSERT_EQ(timeOne, shardOne->getLastCommittedOpTime());
+
+    auto shardTwo = shardRegistry()->getShardNoReload(shardTwoId);
+    LogicalTime timeTwo(Timestamp(15, 1));
+    shardTwo->updateLastCommittedOpTime(timeTwo);
+    ASSERT_EQ(timeTwo, shardTwo->getLastCommittedOpTime());
+
+    auto maxTime = computeAtClusterTime(operationContext(), {shardOneId, shardTwoId});
+    ASSERT_EQ(maxTime, timeTwo);
+}
+
+TEST_F(AtClusterTimeTest, ComputeValidInvalid) {
+    auto shardOne = shardRegistry()->getShardNoReload(shardOneId);
+    ASSERT_EQ(LogicalTime(), shardOne->getLastCommittedOpTime());
+
+    auto shardTwo = shardRegistry()->getShardNoReload(shardTwoId);
+    LogicalTime timeTwo(Timestamp(15, 1));
+    shardTwo->updateLastCommittedOpTime(timeTwo);
+    ASSERT_EQ(timeTwo, shardTwo->getLastCommittedOpTime());
+
+    auto maxTime = computeAtClusterTime(operationContext(), {shardOneId, shardTwoId});
+    ASSERT_EQ(maxTime, timeTwo);
+}
+
+TEST_F(AtClusterTimeTest, ComputeInvalidInvalid) {
+    auto shardOne = shardRegistry()->getShardNoReload(shardOneId);
+    ASSERT_EQ(LogicalTime(), shardOne->getLastCommittedOpTime());
+
+    auto shardTwo = shardRegistry()->getShardNoReload(shardTwoId);
+    ASSERT_EQ(LogicalTime(), shardTwo->getLastCommittedOpTime());
+
+    auto maxTime = computeAtClusterTime(operationContext(), {shardOneId, shardTwoId});
+    ASSERT_EQ(maxTime, LogicalTime());
+}
+
+}  // namespace
+}  // namespace mongo