add tests

[pjc0247]

#define CATCH_CONFIG_MAIN
#include "catch.h"

TEST_CASE("parse from string") {
    JSON_CLASS(NestedObject)
    {
    public:
        FIELD(int, _int);
        FIELD(bool, _bool);
    };
    JSON_CLASS(TestObject)
    {
    public:
        FIELD(int, _int);
        FIELD(bool, _bool);
        //FIELD(float, _float);
        FIELD(std::string, _string);

        FIELD(std::vector<int>, _vector);

        FIELD(NestedObject, _nested);
    };

    TestObject obj;
    obj.ParseFromString(
        "{"
        /* for 'basic types' section */
        "\"_int\" : 5,"
        "\"_bool\" : \"true\","
        //"\"_float\" : 2.5,"
        "\"_string\" : \"hello\","

        /* for 'std::vector type' section */
        "\"_vector\" : [1, 2, 3 ,4 ,5],"

        /* for 'std::map type' section */
        //"\"_vector\" : [1, 2, 3 ,4 ,5],"

        /* for 'nested object' section */
        "\"_nested\" : {"
            "\"_int\" : 14,"
            "\"_bool\" : \"false\""
            "}"
        "}");

    SECTION("basic types") {
        REQUIRE(obj._int == 5);
        REQUIRE(obj._bool == true);
        //REQUIRE(obj._float == 5.0f);
        REQUIRE(obj._string == "hello");
    }
    SECTION("std::vector type") {
        REQUIRE(obj._vector.size() == 5);
        REQUIRE(obj._vector == (std::vector<int>{1, 2, 3, 4, 5}));
    }
    SECTION("std::map type") {
        /* .... */
    }
    SECTION("nested object") {
        REQUIRE(obj._nested._int == 14);
        REQUIRE(obj._nested._bool == false);
    }
}

[jwvg0425]

added.