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diff --git a/src/mongo/db/catalog/coll_mod_test.cpp b/src/mongo/db/catalog/coll_mod_test.cpp
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+++ b/src/mongo/db/catalog/coll_mod_test.cpp
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+/**
+ *    Copyright (C) 2022-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/db/catalog/coll_mod.h"
+
+#include <boost/optional.hpp>
+
+#include "mongo/db/coll_mod_gen.h"
+#include "mongo/unittest/unittest.h"
+
+namespace mongo {
+namespace {
+TEST(CollModOptionTest, isConvertingIndexToUnique) {
+    IDLParserErrorContext ctx("collMod");
+    auto requestObj = fromjson("{index: {keyPattern: {a: 1}, unique: true}}");
+    auto request = CollModRequest::parse(ctx, requestObj);
+    ASSERT_TRUE(isCollModIndexUniqueConversion(request));
+
+    requestObj = fromjson("{index: {keyPattern: {a: 1}, unique: true, hidden: true}}");
+    request = CollModRequest::parse(ctx, requestObj);
+    ASSERT_TRUE(isCollModIndexUniqueConversion(request));
+
+    requestObj = fromjson(
+        "{index: {keyPattern: {a: 1}, unique: true, hidden: true}, validationAction: 'warn'}");
+    request = CollModRequest::parse(ctx, requestObj);
+    ASSERT_TRUE(isCollModIndexUniqueConversion(request));
+
+    requestObj = fromjson("{index: {keyPattern: {a: 1}, unique: true}, dryRun: true}");
+    request = CollModRequest::parse(ctx, requestObj);
+    ASSERT_FALSE(isCollModIndexUniqueConversion(request));
+
+    requestObj = fromjson("{index: {keyPattern: {a: 1}, unique: true}, dryRun: false}");
+    request = CollModRequest::parse(ctx, requestObj);
+    ASSERT_TRUE(isCollModIndexUniqueConversion(request));
+
+    requestObj = fromjson("{index: {keyPattern: {a: 1}, prepareUnique: true}}");
+    request = CollModRequest::parse(ctx, requestObj);
+    ASSERT_FALSE(isCollModIndexUniqueConversion(request));
+
+    requestObj = fromjson("{validationAction: 'warn'}");
+    request = CollModRequest::parse(ctx, requestObj);
+    ASSERT_FALSE(isCollModIndexUniqueConversion(request));
+}
+
+TEST(CollModOptionTest, makeDryRunRequest) {
+    IDLParserErrorContext ctx("collMod");
+    auto requestObj = fromjson("{index: {keyPattern: {a: 1}, unique: true}}");
+    auto request = CollModRequest::parse(ctx, requestObj);
+    auto dryRunRequest = makeCollModDryRunRequest(request);
+    ASSERT_TRUE(dryRunRequest.getIndex()->getKeyPattern()->binaryEqual(fromjson("{a: 1}")));
+    ASSERT_TRUE(dryRunRequest.getIndex()->getUnique() && *dryRunRequest.getIndex()->getUnique());
+    ASSERT_TRUE(dryRunRequest.getDryRun() && *dryRunRequest.getDryRun());
+
+    requestObj = fromjson("{index: {keyPattern: {a: 1}, unique: true, hidden: true}}");
+    request = CollModRequest::parse(ctx, requestObj);
+    dryRunRequest = makeCollModDryRunRequest(request);
+    ASSERT_TRUE(dryRunRequest.getIndex()->getKeyPattern()->binaryEqual(fromjson("{a: 1}")));
+    ASSERT_TRUE(dryRunRequest.getIndex()->getUnique() && *dryRunRequest.getIndex()->getUnique());
+    ASSERT_FALSE(dryRunRequest.getIndex()->getHidden());
+    ASSERT_TRUE(dryRunRequest.getDryRun() && *dryRunRequest.getDryRun());
+
+    requestObj = fromjson(
+        "{index: {keyPattern: {a: 1}, unique: true, hidden: true}, validationAction: 'warn'}");
+    request = CollModRequest::parse(ctx, requestObj);
+    dryRunRequest = makeCollModDryRunRequest(request);
+    ASSERT_TRUE(dryRunRequest.getIndex()->getKeyPattern()->binaryEqual(fromjson("{a: 1}")));
+    ASSERT_TRUE(dryRunRequest.getIndex()->getUnique() && *dryRunRequest.getIndex()->getUnique());
+    ASSERT_FALSE(dryRunRequest.getIndex()->getHidden());
+    ASSERT_FALSE(dryRunRequest.getValidationAction());
+    ASSERT_TRUE(dryRunRequest.getDryRun() && *dryRunRequest.getDryRun());
+
+    requestObj = fromjson("{index: {keyPattern: {a: 1}, unique: true}, dryRun: false}");
+    request = CollModRequest::parse(ctx, requestObj);
+    dryRunRequest = makeCollModDryRunRequest(request);
+    ASSERT_TRUE(dryRunRequest.getIndex()->getKeyPattern()->binaryEqual(fromjson("{a: 1}")));
+    ASSERT_TRUE(dryRunRequest.getIndex()->getUnique() && *dryRunRequest.getIndex()->getUnique());
+    ASSERT_TRUE(dryRunRequest.getDryRun() && *dryRunRequest.getDryRun());
+}
+}  // namespace
+}  // namespace mongo