Function get_json

tests/document_test.cpp:337–343

}

static std::string get_json(const std::string& file) {
  std::ifstream ifs;
  std::stringstream ss;
  ifs.open(file.data());
  ss << ifs.rdbuf();
  return ss.str();
}

static std::vector<std::string> get_all_jsons(const std::string& dirname) {
  DIR* dir = opendir(dirname.c_str());