use namespace & not fix return

test/test_class.cpp

@@ -4,12 +4,11 @@
 
 #include <catch2/catch_all.hpp>
 
-#include "mrubypp.h"
+#include "engine.h"
 
 class Point {
 public:
-  Point(int x, int y) : x_(x), y_(y) {
-  }
+  Point(int x, int y) : x_(x), y_(y) {}
 
   void set_values(int x, int y) {
     x_ = x;
@@ -18,15 +17,11 @@ public:
 
   int get_x() const { return x_; }
 
-  void set_x(int x) {
-    x_ = x;
-  }
+  void set_x(int x) { x_ = x; }
 
   int get_y() const { return y_; }
 
-  void set_y(int y) {
-    y_ = y;
-  }
+  void set_y(int y) { y_ = y; }
 
   void add(const Point &other) {
     this->x_ += other.x_;
@@ -48,12 +43,11 @@ static mrb_value point_native_div(mrb_state *mrb, mrb_value self) {
   return self;
 }
 
-template<>
-struct mrubypp_converter<Point> {
+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));
+        mrb_data_object_alloc(mrb, mrb->object_class, new Point(var),
+                              &mrubypp_class_builder<Point>::data_type));
     return obj;
   }
 
@@ -67,7 +61,7 @@ struct mrubypp_converter<Point> {
 };
 
 TEST_CASE("Point", "[class]") {
-  mrubypp engine;
+  engine engine;
   engine.class_builder<Point>("Point")
       .def_constructor<int, int>()
       .def_method("add", &Point::add)

test/test_engine.cpp

@@ -7,10 +7,10 @@
 
 #include <catch2/catch_all.hpp>
 
-#include "mrubypp.h"
+#include "engine.h"
 
 TEST_CASE("none args call", "[engine]") {
-  mrubypp engine;
+  engine engine;
   engine.load(R"(
       def get_1()
         1
@@ -22,7 +22,7 @@ TEST_CASE("none args call", "[engine]") {
 }
 
 TEST_CASE("args call", "[engine]") {
-  mrubypp engine;
+  engine engine;
   engine.load(R"(
       def sort_and_get_first(a)
         a.sort!
@@ -36,7 +36,7 @@ TEST_CASE("args call", "[engine]") {
 }
 
 TEST_CASE("call benchmark", "[!benchmark]") {
-  mrubypp engine;
+  engine engine;
   engine.load(R"(
       def get_same(a)
         return a