add catch2 test

test/test_class.cpp

@@ -0,0 +1,74 @@
+//
+// Created by ZekeXiao on 2025/10/18.
+//
+
+#include <catch2/catch_all.hpp>
+
+#include "mrubypp.h"
+
+class Point {
+public:
+  Point(int x, int y) : x_(x), y_(y) {}
+
+  void set_values(int x, int y) {
+    x_ = x;
+    y_ = y;
+  }
+
+  int get_x() const { return x_; }
+  void set_x(int x) { x_ = x; }
+
+  int get_y() const { return y_; }
+  void set_y(int y) { y_ = y; }
+
+  void add(const Point &other) {
+    this->x_ += other.x_;
+    this->y_ += other.y_;
+  }
+  static int none() { return 1; }
+
+private:
+  int x_;
+  int y_;
+};
+
+template <> struct mrubypp_converter<Point> {
+  static mrb_value to_mrb(mrb_state *mrb, const Point &var) {
+    mrb_value obj = mrb_obj_value(
+        mrb_data_object_alloc(mrb, mrb->object_class, new Point(var),
+                              &mrubypp_class_builder<Point>::data_type));
+    return obj;
+  }
+
+  static Point from_mrb(mrb_state *mrb, mrb_value value) {
+    if (mrb_type(value) == MRB_TT_DATA) {
+      Point *point = static_cast<Point *>(DATA_PTR(value));
+      return *point;
+    }
+    return Point(0, 0);
+  }
+};
+
+TEST_CASE("Point", "[class]") {
+  mrubypp engine;
+  engine.class_builder<Point>("Point")
+      .def_constructor<int, int>()
+      .def_method("add", &Point::add)
+      .def_class_method("none", &Point::none)
+      .def_property("x", &Point::get_x, &Point::set_x);
+
+  engine.load(R"(
+    def test_point()
+      p = Point.new(3, 4)
+      p.x = 10
+      p.add(p)
+      p.x += Point::none()
+      return p
+    end
+  )");
+
+  auto point_result = engine.call<Point>("test_point");
+
+  REQUIRE(point_result.get_x() == 21);
+  REQUIRE(point_result.get_y() == 8);
+}