Function TEST

src/leveldb/util/env_test.cc:26–71

};

TEST(EnvTest, ReadWrite) {
  Random rnd(test::RandomSeed());

  // Get file to use for testing.
  std::string test_dir;
  ASSERT_OK(env_->GetTestDirectory(&test_dir));
  std::string test_file_name = test_dir + "/open_on_read.txt";
  WritableFile* writable_file;
  ASSERT_OK(env_->NewWritableFile(test_file_name, &writable_file));

  // Fill a file with data generated via a sequence of randomly sized writes.
  static const size_t kDataSize = 10 * 1048576;
  std::string data;
  while (data.size() < kDataSize) {
    int len = rnd.Skewed(18);  // Up to 2^18 - 1, but typically much smaller
    std::string r;
    test::RandomString(&rnd, len, &r);
    ASSERT_OK(writable_file->Append(r));
    data += r;
    if (rnd.OneIn(10)) {
      ASSERT_OK(writable_file->Flush());
    }
  }
  ASSERT_OK(writable_file->Sync());
  ASSERT_OK(writable_file->Close());
  delete writable_file;

  // Read all data using a sequence of randomly sized reads.
  SequentialFile* sequential_file;
  ASSERT_OK(env_->NewSequentialFile(test_file_name, &sequential_file));
  std::string read_result;
  std::string scratch;
  while (read_result.size() < data.size()) {
    int len = std::min<int>(rnd.Skewed(18), data.size() - read_result.size());
    scratch.resize(std::max(len, 1));  // at least 1 so &scratch[0] is legal
    Slice read;
    ASSERT_OK(sequential_file->Read(len, &read, &scratch[0]));
    if (len > 0) {
      ASSERT_GT(read.size(), 0);
    }
    ASSERT_LE(read.size(), len);
    read_result.append(read.data(), read.size());
  }
  ASSERT_EQ(read_result, data);
  delete sequential_file;
}

TEST(EnvTest, RunImmediately) {
  struct RunState {