cpp-json/test/json_binder_tuple_test.cxx

//
//  json_binder_tuple.t.h
//  json
//
//  Created by Sam Jaffe on 2/26/17.
//

#include <gmock/gmock.h>
#include "json/json_binder.hpp"

using namespace json::binder;
using namespace json::parser;

struct point { int x; int y; };
bool operator==(point const & lhs, point const & rhs) {
  return lhs.x == rhs.x && lhs.y == rhs.y;
}

TEST(JsonBinderTupleTest, ParsesTuple) {
  char data[] = "[ 1, 2 ]";
  using tuple = std::tuple<int, int>;
  tuple out = std::make_tuple(0, 0);
  auto binder = make_default_tuple_binder<int, int>();
  parse(json::binder::bind(out, binder), data, allow_all);
  EXPECT_THAT(out, std::make_tuple(1, 2));
}

TEST(JsonBinderTupleTest, ThrowsIfMissingData) {
  char data[] = "[ 1 ]";
  using tuple = std::tuple<int, int>;
  tuple out = std::make_tuple(0, 0);
  auto binder = make_default_tuple_binder<int, int>();
  EXPECT_THROW(parse(json::binder::bind(out, binder), data, allow_all),
               json::malformed_json_exception);
}

TEST(JsonBinderTupleTest, ThrowsIfDataRemaining) {
  char data[] = "[ 1, 2, 3 ]";
  using tuple = std::tuple<int, int>;
  tuple out = std::make_tuple(0, 0);
  auto binder = make_default_tuple_binder<int, int>();
  EXPECT_THROW(parse(json::binder::bind(out, binder), data, allow_all),
               json::malformed_json_exception);
}

TEST(JsonBinderTupleTest, ThrowsIfEOB) {
  char data[] = "[ 1, 2 ";
  using tuple = std::tuple<int, int>;
  tuple out = std::make_tuple(0, 0);
  auto binder = make_default_tuple_binder<int, int>();
  EXPECT_THROW(parse(json::binder::bind(out, binder), data, allow_all),
               json::unterminated_json_exception);
}

TEST(JsonBinderTupleTest, ThrowsIfMissingStartToken) {
  char data[] = "1, 2 ]";
  using tuple = std::tuple<int, int>;
  tuple out = std::make_tuple(0, 0);
  auto binder = make_default_tuple_binder<int, int>();
  EXPECT_THROW(parse(json::binder::bind(out, binder), data, allow_all),
               json::malformed_json_exception);
}

TEST(JsonBinderTupleTest, InnerTypeIsIndependant) {
  char data[] = "[ 1, 0.5, \"hello\" ]";
  using tuple = std::tuple<int, double, std::string>;
  tuple out = std::make_tuple(0, 0.0, "");
  auto binder = make_default_tuple_binder<int, double, std::string>();
  EXPECT_NO_THROW(parse(json::binder::bind(out, binder), data, allow_all));
  EXPECT_THAT(out, std::make_tuple(1, 0.5, "hello"));
}

TEST(JsonBinderTupleTest, WritesTupleWithoutWhitespace) {
  std::string expected = "[1,\"word\"]";
  std::stringstream ss;
  using tuple = std::tuple<int, std::string>;
  tuple const in = std::make_tuple(1, "word");
  auto binder = make_default_tuple_binder<int, std::string>();
  write(json::binder::bind(in, binder), ss);
  EXPECT_THAT(ss.str(), expected);
}

TEST(JsonBinderTupleTest, CanParseTupleAsStruct) {
  char data[] = "[ 10, 5 ]";
  point out{0, 0};
  auto binder = tuple_binder<point>()(&point::x)(&point::y);
  EXPECT_NO_THROW(parse(json::binder::bind(out, binder), data, allow_all));
  EXPECT_THAT(out, (point{10, 5}));
}

TEST(JsonBinderTupleTest, WritesTupleAsStructWithoutWhitespace) {
  std::string const expected = "[10,5]";
  std::stringstream ss;
  point const in{10, 5};
  auto binder = tuple_binder<point>()(&point::x)(&point::y);
  EXPECT_NO_THROW(write(json::binder::bind(in, binder), ss));
  EXPECT_THAT(ss.str(), expected);
}