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+/**
+ * Copyright (C) 2023-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 <string>
+
+#include "mongo/bson/bsonobj.h"
+#include "mongo/bson/bsonobjbuilder.h"
+#include "mongo/db/query/find_common.h"
+
+#include "mongo/unittest/unittest.h"
+
+namespace {
+
+using namespace mongo;
+
+TEST(BSONArrayResponseSizeTrackerTest, AddLargeNumberOfElements) {
+ BSONObjBuilder bsonObjBuilder;
+ {
+ FindCommon::BSONArrayResponseSizeTracker sizeTracker;
+ BSONArrayBuilder arrayBuilder{bsonObjBuilder.subarrayStart("a")};
+ BSONObj emptyObject;
+ while (sizeTracker.haveSpaceForNext(emptyObject)) {
+ sizeTracker.add(emptyObject);
+ arrayBuilder.append(emptyObject);
+ }
+ }
+ // If the BSON object is successfully constructed, then space accounting was correct.
+ bsonObjBuilder.obj();
+}
+TEST(BSONArrayResponseSizeTrackerTest, CanAddAtLeastOneDocument) {
+ auto largeObject = BSON("a" << std::string(16 * 1024 * 1024, 'A'));
+ BSONObj emptyObject;
+ BSONObjBuilder bsonObjBuilder;
+ {
+ FindCommon::BSONArrayResponseSizeTracker sizeTracker;
+ BSONArrayBuilder arrayBuilder{bsonObjBuilder.subarrayStart("a")};
+ // Add an object that is larger than 16MB.
+ ASSERT(sizeTracker.haveSpaceForNext(largeObject));
+ sizeTracker.add(largeObject);
+ arrayBuilder.append(largeObject);
+ ASSERT(!sizeTracker.haveSpaceForNext(emptyObject));
+ }
+ // If the BSON object is successfully constructed, then space accounting was correct.
+ bsonObjBuilder.obj();
+}
+} // namespace