thirdparty-ArduinoJson/extras/tests/JsonSerializer/CustomWriter.cpp

// ArduinoJson - https://arduinojson.org
// Copyright © 2014-2023, Benoit BLANCHON
// MIT License

#include <ArduinoJson.h>
#include <catch.hpp>

class CustomWriter {
 public:
  CustomWriter() {}

  size_t write(uint8_t c) {
    _str.append(1, static_cast<char>(c));
    return 1;
  }

  size_t write(const uint8_t* s, size_t n) {
    _str.append(reinterpret_cast<const char*>(s), n);
    return n;
  }

  const std::string& str() const {
    return _str;
  }

 private:
  CustomWriter(const CustomWriter&);  // non-copiable
  CustomWriter& operator=(const CustomWriter&);

  std::string _str;
};

TEST_CASE("CustomWriter") {
  DynamicJsonDocument doc(4096);
  JsonArray array = doc.to<JsonArray>();
  array.add(4);
  array.add(2);

  SECTION("serializeJson()") {
    CustomWriter writer;
    serializeJson(array, writer);

    REQUIRE("[4,2]" == writer.str());
  }

  SECTION("serializeJsonPretty") {
    CustomWriter writer;
    serializeJsonPretty(array, writer);

    REQUIRE("[\r\n  4,\r\n  2\r\n]" == writer.str());
  }
}