cpp-stateful-serializer/test/jsonizer_test.cxx

//
//  jsonizer_test.cxx
//  serializer-test
//
//  Created by Sam Jaffe on 3/16/23.
//

#include "xcode_gtest_helper.h"

#include <map>
#include <set>
#include <vector>

#include <serializer/jsonizer.tpp>

#define CONCAT2(A, B) A##B
#define CONCAT(A, B) CONCAT2(A, B)

#define EXPECT_ROUNDTRIP(izer, value, as_json) \
  Json::Value CONCAT(json_, __LINE__) = izer.to_json(value); \
  EXPECT_THAT(CONCAT(json_, __LINE__), as_json); \
  EXPECT_THAT(izer.from_json<decltype(value)>(CONCAT(json_, __LINE__)), value)

using std::operator""s;
using std::operator""sv;
using namespace magic_enum::bitwise_operators;

enum class Color { RED, BLUE, GREEN };
enum class Mask { LEFT = 1, RIGHT = 2 };

Json::Value operator""_json(char const *str, size_t len) {
  Json::Value rval;
  Json::Reader reader;
  if (!reader.parse(str, str + len, rval)) {
    throw std::invalid_argument(reader.getFormattedErrorMessages());
  }
  return rval;
}

TEST(JsonizerTest, ParsesNumbers) {
  serializer::Jsonizer izer;
  EXPECT_ROUNDTRIP(izer, 1.5f, "1.5"_json);
  EXPECT_ROUNDTRIP(izer, 1.5, "1.5"_json);
  EXPECT_ROUNDTRIP(izer, 3, "3"_json);
  EXPECT_ROUNDTRIP(izer, true, "true"_json);
}

TEST(JsonizerTest, ParsesStrings) {
  serializer::Jsonizer izer;
  EXPECT_ROUNDTRIP(izer, "hello"s, "\"hello\""_json);
  EXPECT_THAT(izer.to_json("hello"), "\"hello\""_json);
  EXPECT_THAT(izer.to_json("hello"sv), "\"hello\""_json);
}

TEST(JsonizerTest, ParsesEnums) {
  serializer::Jsonizer izer;
  EXPECT_ROUNDTRIP(izer, Color::RED, "\"RED\""_json);
  EXPECT_TRUE(magic_enum::detail::is_flags_v<Mask>);
  EXPECT_ROUNDTRIP(izer, Mask::LEFT | Mask::RIGHT, "\"LEFT|RIGHT\""_json);
}

TEST(JsonizerTest, ParsesTuples) {
  serializer::Jsonizer izer;
  EXPECT_ROUNDTRIP(izer, std::make_pair(1, true), "[1, true]"_json);
  EXPECT_ROUNDTRIP(izer, std::make_tuple(1, true, 1.5, "hi"s),
                   "[1, true, 1.5, \"hi\"]"_json);
}

TEST(JsonizerTest, ParsesCollection) {
  serializer::Jsonizer izer;
  EXPECT_ROUNDTRIP(izer, std::vector({1, 2, 3, 1}), "[1, 2, 3, 1]"_json);
  EXPECT_ROUNDTRIP(izer, std::set({1, 2, 3, 1}), "[1, 2, 3]"_json);
}

TEST(JsonizerTest, ParsesAssociative) {
  serializer::Jsonizer izer;
  EXPECT_ROUNDTRIP(izer, (std::map<int, int>{{1, 2}, {3, 1}}),
                   "{\"1\":2, \"3\":1}"_json);
  
  std::map<int, int> ex;
  izer.from_json(ex, "[[1, 2], [3, 1]]"_json);
  EXPECT_THAT(ex, (std::map<int, int>{{1, 2}, {3, 1}}));
}