refactor: rename testbench to test.

- rename testbench to test.
- add benchmark for future development.

test/yycc/macro/ptr_size_detector.cpp

@@ -0,0 +1,18 @@
+#include <gtest/gtest.h>
+#include <yycc.hpp>
+#include <yycc/macro/ptr_size_detector.hpp>
+
+#define PTR_SIZE ::yycc::macro::ptr_size
+
+namespace yycctest::macro::ptr_size {
+
+    TEST(MacroPtrSize, Main) {
+        auto rv = PTR_SIZE::get_ptr_size();
+#if defined(YYCC_PTRSIZE_32)
+        EXPECT_EQ(rv, PTR_SIZE::PtrSizeKind::Bits32);
+#else
+        EXPECT_EQ(rv, PTR_SIZE::PtrSizeKind::Bits64);
+#endif
+    }
+
+} // namespace yycctest::macro::ptr_size