utils/byte_writers_test.cc

// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#include "utils/byte_writers.h"

#include <cstdint>
#include <vector>

#include "gmock/gmock.h"
#include "gtest/gtest.h"

namespace credentio {

namespace {

using ::testing::ElementsAre;

TEST(ByteWritersTest, Write64Bit) {
  std::vector<uint8_t> bytes;
  WriteUint64NetworkOrder(0x1122334455667788, &bytes);
  EXPECT_THAT(bytes,
              ElementsAre(0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88));
}

TEST(ByteWritersTest, Write32Bit) {
  std::vector<uint8_t> bytes;
  WriteUint32NetworkOrder(0x11223344, &bytes);
  EXPECT_THAT(bytes, ElementsAre(0x11, 0x22, 0x33, 0x44));
}

TEST(ByteWritersTest, Write16Bit) {
  std::vector<uint8_t> bytes;
  WriteUint16NetworkOrder(0x1234, &bytes);
  EXPECT_THAT(bytes, ElementsAre(0x12, 0x34));
}

TEST(ByteWritersTest, Write64BitToNonEmptyVector) {
  std::vector<uint8_t> bytes = {0xaa, 0xbb};
  WriteUint64NetworkOrder(0x1122334455667788, &bytes);
  EXPECT_THAT(bytes, ElementsAre(0xaa, 0xbb, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66,
                                 0x77, 0x88));
}

TEST(ByteWritersTest, Write32BitToNonEmptyVector) {
  std::vector<uint8_t> bytes = {0xaa, 0xbb};
  WriteUint32NetworkOrder(0x11223344, &bytes);
  EXPECT_THAT(bytes, ElementsAre(0xaa, 0xbb, 0x11, 0x22, 0x33, 0x44));
}

TEST(ByteWritersTest, Write16BitToNonEmptyVector) {
  std::vector<uint8_t> bytes = {0xaa, 0xbb};
  WriteUint16NetworkOrder(0x1234, &bytes);
  EXPECT_THAT(bytes, ElementsAre(0xaa, 0xbb, 0x12, 0x34));
}

}  // namespace
}  // namespace credentio