add catch2 test

test/test_engine.cpp

@@ -0,0 +1,50 @@
+//
+// Created by ZekeXiao on 2025/10/18.
+//
+//
+// Created by ZekeXiao on 2025/10/18.
+//
+
+#include <catch2/catch_all.hpp>
+
+#include "mrubypp.h"
+
+TEST_CASE("none args call", "[engine]") {
+  mrubypp engine;
+  engine.load(R"(
+      def get_1()
+        1
+      end
+  )");
+
+  auto b = engine.call<int>("get_1");
+  REQUIRE(b == 1);
+}
+
+TEST_CASE("args call", "[engine]") {
+  mrubypp engine;
+  engine.load(R"(
+      def add(a)
+        a.sort!
+        a[0]
+      end
+  )");
+
+  std::vector<int> a{3, 1, 2};
+  auto b = engine.call<int>("add", a);
+  REQUIRE(b == 1);
+}
+
+TEST_CASE("call benchmark", "[!benchmark]") {
+  mrubypp engine;
+  engine.load(R"(
+      def get_same(a)
+        return a
+      end
+  )");
+
+  BENCHMARK("call and return") {
+    auto b = engine.call<int>("get_same", 1);
+    REQUIRE(b == 1);
+  };
+}