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diff --git a/src/mongo/db/catalog/commit_quorum_options_test.cpp b/src/mongo/db/catalog/commit_quorum_options_test.cpp
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+++ b/src/mongo/db/catalog/commit_quorum_options_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/catalog/commit_quorum_options.h"
+#include "mongo/db/jsobj.h"
+#include "mongo/unittest/unittest.h"
+
+namespace mongo {
+namespace {
+
+TEST(CommitQuorumOptionsTest, ParseReturnsFailedToParseOnEmptyDocument) {
+    auto status = CommitQuorumOptions().parse({});
+    ASSERT_EQUALS(ErrorCodes::FailedToParse, status);
+    ASSERT_EQUALS("commit quorum object cannot be empty", status.reason());
+}
+
+TEST(CommitQuorumOptionsTest, ParseReturnsFailedToParseIfCommitQuorumIsNotNumberOrString) {
+    auto status = CommitQuorumOptions().parse(BSON("commitQuorum" << BSONObj()));
+    ASSERT_EQUALS(ErrorCodes::FailedToParse, status);
+    ASSERT_EQUALS("commitQuorum has to be a number or a string", status.reason());
+}
+
+TEST(CommitQuorumOptionsTest, ParseSetsNumNodesIfCommitQuorumIsANumber) {
+    CommitQuorumOptions options;
+    ASSERT_OK(options.parse(BSON("commitQuorum" << 3)));
+    ASSERT_EQUALS(3, options.numNodes);
+    ASSERT_EQUALS("", options.mode);
+}
+
+TEST(CommitQuorumOptionsTest, ParseSetsModeIfCommitQuorumIsAString) {
+    CommitQuorumOptions options;
+    ASSERT_OK(options.parse(BSON("commitQuorum" << CommitQuorumOptions::kMajority)));
+    ASSERT_EQUALS(0, options.numNodes);
+    ASSERT_EQUALS(CommitQuorumOptions::kMajority, options.mode);
+}
+
+TEST(CommitQuorumOptionsTest, ParseReturnsFailedToParseOnUnknownField) {
+    auto status = CommitQuorumOptions().parse(BSON("x" << 123));
+    ASSERT_EQUALS(ErrorCodes::FailedToParse, status);
+    ASSERT_EQUALS("unrecognized commit quorum field: x", status.reason());
+}
+
+TEST(CommitQuorumOptionsTest, ToBSON) {
+    {
+        CommitQuorumOptions options;
+        ASSERT_OK(options.parse(BSON("commitQuorum" << 1)));
+        ASSERT_TRUE(options.toBSON().woCompare(BSON("commitQuorum" << 1)) == 0);
+    }
+
+    {
+        CommitQuorumOptions options;
+        ASSERT_OK(options.parse(BSON("commitQuorum"
+                                     << "someTag")));
+        ASSERT_TRUE(options.toBSON().woCompare(BSON("commitQuorum"
+                                                    << "someTag")) == 0);
+    }
+
+    {
+        // Strings take precedence over numbers.
+        CommitQuorumOptions options;
+        options.mode = "majority";
+        options.numNodes = 5;
+        ASSERT_TRUE(options.toBSON().woCompare(BSON("commitQuorum"
+                                                    << "majority")) == 0);
+    }
+}
+
+}  // namespace
+}  // namespace mongo