tests/cppunit/encoding_test.cc

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 *   http://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 "encoding.h"

#include <gtest/gtest.h>
#include <rocksdb/slice.h>

#include <cstdint>
#include <limits>
#include <string>
#include <vector>

TEST(Util, EncodeAndDecodeDouble) {
  std::vector<double> values = {-1234, -100.1234, -1.2345, 0, 1.2345, 100.1234, 1234};
  std::string prev_bytes;
  for (auto value : values) {
    std::string bytes;
    PutDouble(&bytes, value);
    double got = DecodeDouble(bytes.data());
    if (!prev_bytes.empty()) {
      ASSERT_LT(prev_bytes, bytes);
    }
    prev_bytes.assign(bytes);
    ASSERT_EQ(value, got);
  }
}

TEST(Util, EncodeAndDecodeInt32AsVarint32) {
  std::vector<uint32_t> values = {200, 65000, 16700000, 4294000000};
  std::vector<size_t> encoded_sizes = {2, 3, 4, 5};
  for (size_t i = 0; i < values.size(); ++i) {
    std::string buf;
    PutVarint32(&buf, values[i]);
    EXPECT_EQ(buf.size(), encoded_sizes[i]);
    uint32_t result = 0;
    rocksdb::Slice s(buf);
    GetVarint32(&s, &result);
    ASSERT_EQ(result, values[i]);
  }
}