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diff --git a/src/mongo/bson/util/simple8b_test.cpp b/src/mongo/bson/util/simple8b_test.cpp
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+++ b/src/mongo/bson/util/simple8b_test.cpp
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+/**
+ *    Copyright (C) 2021-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 <vector>
+
+#include "mongo/bson/util/simple8b.h"
+#include "mongo/unittest/unittest.h"
+
+using namespace mongo;
+
+void areVectorsEqual(std::vector<uint64_t> actualVector, std::vector<uint64_t> expectedVector) {
+    ASSERT_EQ(actualVector.size(), expectedVector.size());
+
+    for (unsigned i = 0; i < actualVector.size(); ++i) {
+        ASSERT_EQ(actualVector[i], expectedVector[i]);
+    }
+}
+
+TEST(Simple8b, EncodeOneValueTest) {
+    uint8_t selector = 15;
+    std::vector<uint64_t> values = {1};
+    uint64_t simple8bWord = Simple8b::encodeSimple8b(selector, values);
+    ASSERT_EQUALS(simple8bWord, 0xF000000000000001);
+}
+
+TEST(Simple8b, DecodeOneValueTest) {
+    uint64_t simple8bWord = 0xF000000000000001;
+    std::vector<uint64_t> values = Simple8b::decodeSimple8b(simple8bWord);
+    std::vector<uint64_t> expectedValues = {1};
+    areVectorsEqual(values, expectedValues);
+}
+
+TEST(Simple8b, EncodeMultipleValuesTest) {
+    uint8_t selector = 13;
+    std::vector<uint64_t> values = {1, 2, 3};
+    uint64_t simple8bWord = Simple8b::encodeSimple8b(selector, values);
+    ASSERT_EQUALS(simple8bWord, 0xD000010000200003);
+}
+
+TEST(Simple8b, DecodeMultipleValuesTest) {
+    uint64_t simple8bWord = 0xD000010000200003;
+    std::vector<uint64_t> values = Simple8b::decodeSimple8b(simple8bWord);
+    std::vector<uint64_t> expectedValues = {1, 2, 3};
+    areVectorsEqual(values, expectedValues);
+}
+
+TEST(Simple8b, EncodeMaxValuesTest) {
+    uint8_t selector = 2;
+    std::vector<uint64_t> values(60, 1);
+    uint64_t simple8bWord = Simple8b::encodeSimple8b(selector, values);
+    ASSERT_EQUALS(simple8bWord, 0x2FFFFFFFFFFFFFFF);
+}
+
+TEST(Simple8b, DecodeMaxValuesTest) {
+    uint64_t simple8bWord = 0x2FFFFFFFFFFFFFFF;
+    std::vector<uint64_t> values = Simple8b::decodeSimple8b(simple8bWord);
+    std::vector<uint64_t> expectedValues(60, 1);
+    areVectorsEqual(values, expectedValues);
+}
+
+TEST(Simple8b, InvalidEncodeOneSelectorTest) {
+    uint8_t selector = 0;
+    std::vector<uint64_t> values = {};
+    uint64_t simple8bWord = Simple8b::encodeSimple8b(selector, values);
+    ASSERT_EQUALS(simple8bWord, 0x1000000000000000);
+}
+
+TEST(Simple8b, InvalidEncodeSixteenSelectorTest) {
+    uint8_t selector = 16;
+    std::vector<uint64_t> values = {};
+    uint64_t simple8bWord = Simple8b::encodeSimple8b(selector, values);
+    ASSERT_EQUALS(simple8bWord, 0x1000000000000000);
+}
+
+TEST(Simple8b, InvalidDecodeOneSelectorTest) {
+    uint64_t simple8bWord = 0x1000000000000000;
+    std::vector<uint64_t> values = Simple8b::decodeSimple8b(simple8bWord);
+    ASSERT_EQUALS(values.size(), 0);
+}