cpp-json/test/json_binder_value_double.t.h

//
//  json_binder_value_double.t.h
//  json
//
//  Created by Sam Jaffe on 2/25/17.
//

#pragma once

#include <cxxtest/TestSuite.h>
#include "json/json_binder.hpp"

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

class json_binder_value_float_TestSuite : public CxxTest::TestSuite {
public:
  void test_bind_to_double_type() {
    char data[] = "0.5";
    double out = 0.0;
    value_binder<double> binder{};
    parse(bind(out, binder), data, allow_all);
    TS_ASSERT_EQUALS(out, 0.5);
  }
  
  void test_parse_out_scientific_notation() {
    char data[] = "2e4";
    double out = 0.0;
    value_binder<double> binder{};
    TS_ASSERT_THROWS_NOTHING(parse(bind(out, binder), data, allow_all));
  }
  
  void test_parse_throws_on_no_data() {
    char data[] = "";
    double out = 0.0;
    value_binder<double> binder{};
    TS_ASSERT_THROWS(parse(bind(out, binder), data, allow_all),
                     json::json_numeric_exception);
  }

  void test_parse_throws_on_non_numeric_data() {
    char data[] = "one half";
    double out = 0.0;
    value_binder<double> binder{};
    TS_ASSERT_THROWS(parse(bind(out, binder), data, allow_all),
                     json::json_numeric_exception);
  }
  
  void test_parse_throws_on_incorrectly_terminated_data_with_flag() {
    char data[] = "5.0boo";
    double out = 0.0;
    value_binder<double> binder{};
    TS_ASSERT_THROWS(parse(bind(out, binder), data,
                           disable_concatenated_json_bodies),
                     json::malformed_json_exception);
    TS_ASSERT_EQUALS(out, 5.0);
  }
  
  void test_parses_double_max_scientific_within_five_decimal_places() {
    char data[] = "1.79769e+308";
    double out = 0.0;
    value_binder<double> binder{};
    TS_ASSERT_THROWS_NOTHING(parse(bind(out, binder), data, allow_all));
    TS_ASSERT_DELTA(out, std::numeric_limits<double>::max(), 1E303);
  }

  void test_throws_exception_on_number_out_of_range_max() {
    char data[] = "1.8e+308";
    double out = 0.0;
    value_binder<double> binder{};
    TS_ASSERT_THROWS(parse(bind(out, binder), data, allow_all),
                     json::json_numeric_width_exception);
  }

  void test_parses_double_lowest_scientific_within_five_decimal_places() {
    char data[] = "-1.79769e+308";
    double out = 0.0;
    value_binder<double> binder{};
    TS_ASSERT_THROWS_NOTHING(parse(bind(out, binder), data, allow_all));
    TS_ASSERT_DELTA(out, std::numeric_limits<double>::lowest(), 1E303);
  }
  
  void test_throws_exception_on_number_out_of_range_lowest() {
    char data[] = "-1.8e+308";
    double out = 0.0;
    value_binder<double> binder{};
    TS_ASSERT_THROWS(parse(bind(out, binder), data, allow_all),
                     json::json_numeric_width_exception);
  }
  
  void test_parses_double_min_scientific_within_five_decimal_places() {
    char data[] = "2.22508e-308"; // 2.22507e-308 is min according to cppreference
    double out = 0.0;
    value_binder<double> binder{};
    TS_ASSERT_THROWS_NOTHING(parse(bind(out, binder), data, allow_all));
    TS_ASSERT_DELTA(out, std::numeric_limits<double>::min(), 1E-303);
  }
  
  void test_throws_exception_on_number_out_of_range_min() {
    char data[] = "2e-308";
    double out = 0.0;
    value_binder<double> binder{};
    TS_ASSERT_THROWS(parse(bind(out, binder), data, allow_all),
                     json::json_numeric_width_exception);
  }
  
  void test_double_number_written_is_equal_exact_binary() {
    std::stringstream ss;
    double in = 500., out = 0;
    value_binder<double> binder{};
    write(bind(in, binder), ss);
    parse(bind(out, binder), ss.str().c_str(), allow_all);
    TS_ASSERT_EQUALS(out, in);
  }
  
  void test_double_number_written_is_equal_inexact_binary() {
    std::stringstream ss;
    double in = 0.3, out = 0;
    value_binder<double> binder{};
    write(bind(in, binder), ss);
    parse(bind(out, binder), ss.str().c_str(), allow_all);
    TS_ASSERT_EQUALS(out, in);
  }
  
  void test_double_number_written_is_equal_at_high_absolute_value() {
    std::stringstream ss;
    double in = 1.34e300, out = 0.0;
    value_binder<double> binder{};
    write(bind(in, binder), ss);
    parse(bind(out, binder), ss.str().c_str(), allow_all);
    TS_ASSERT_EQUALS(out, in);
  }

  void test_double_number_written_is_equal_at_low_absolute_value() {
    std::stringstream ss;
    double in = 1.34e-300, out = 0.0;
    value_binder<double> binder{};
    write(bind(in, binder), ss);
    parse(bind(out, binder), ss.str().c_str(), allow_all);
    TS_ASSERT_DELTA(out, in, 1e-299);
  }
  
  void test_double_number_written_is_equal_at_high_absolute_value_nonscientific() {
    std::stringstream ss;
    double in = 52450012.25, out = 0.0;
    value_binder<double> binder{};
    write(bind(in, binder), ss);
    parse(bind(out, binder), ss.str().c_str(), allow_all);
    TS_ASSERT_EQUALS(out, in);
  }

  void test_double_number_written_is_equal_at_low_absolute_value_nonscientific() {
    std::stringstream ss;
    double in = 0.0002517867, out = 0.0;
    value_binder<double> binder{};
    write(bind(in, binder), ss);
    parse(bind(out, binder), ss.str().c_str(), allow_all);
    TS_ASSERT_DELTA(out, in, 0.000001);
  }
};