diff --git a/README.md b/README.md
index e2ed719..c0c6641 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ This project require at least CMake 3.23 to build. We suggest that you only use
 
 See documentation for how to build this project.
 
-> [!INFO]  
+> [!NOTE]  
 > When building with testbench, you may face link error with GoogleTest. This issue is caused by that the binary provided by your package manager is built in C++ 17 and its ABI is incompatible with C++ 23. The solution is that download GoogleTest source code and build it in C++ 23 on your own. See this [GitHub Issue](https://github.com/google/googletest/issues/4591) for more infomation.
 > Oppositely, you don't need care about this issue if you just want to build YYCC self.
 
diff --git a/src/YYCCLegacy/StdPatch.cpp b/src/YYCCLegacy/StdPatch.cpp
deleted file mode 100644
index b0bfe4a..0000000
--- a/src/YYCCLegacy/StdPatch.cpp
+++ /dev/null
@@ -1,9 +0,0 @@
-#include "StdPatch.hpp"
-
-#include "EncodingHelper.hpp"
-#include <string>
-#include <stdexcept>
-
-namespace YYCC::StdPatch {
-
-}
diff --git a/src/YYCCLegacy/StdPatch.hpp b/src/YYCCLegacy/StdPatch.hpp
deleted file mode 100644
index d67fdf1..0000000
--- a/src/YYCCLegacy/StdPatch.hpp
+++ /dev/null
@@ -1,26 +0,0 @@
-#pragma once
-#include "YYCCInternal.hpp"
-
-#include <filesystem>
-#include <string>
-#include <string_view>
-
-namespace YYCC::StdPatch {
-	
-	/**
-	 * @brief Constructs \c std::filesystem::path from UTF8 path.
-	 * @param[in] u8_path UTF8 path string for building.
-	 * @return \c std::filesystem::path instance.
-	 * @exception std::invalid_argument Fail to parse given UTF8 string (maybe invalid?).
-	*/
-	std::filesystem::path ToStdPath(const yycc_u8string_view& u8_path);
-
-	/**
-	 * @brief Returns the UTF8 representation of given \c std::filesystem::path.
-	 * @param[in] path The \c std::filesystem::path instance converting to UTF8 path.
-	 * @return The UTF8 representation of given \c std::filesystem::path.
-	 * @exception std::invalid_argument Fail to convert to UTF8 string.
-	*/
-	yycc_u8string ToUTF8Path(const std::filesystem::path& path);
-
-}
diff --git a/testbench/CMakeLists.txt b/testbench/CMakeLists.txt
index e4e97e4..269ab3d 100644
--- a/testbench/CMakeLists.txt
+++ b/testbench/CMakeLists.txt
@@ -4,6 +4,7 @@ add_executable(YYCCTestbench "")
 target_sources(YYCCTestbench
 PRIVATE
     main.cpp
+    yycc/macro/version_cmp.cpp
     yycc/constraint.cpp
     yycc/constraint/builder.cpp
     yycc/string/op.cpp
diff --git a/testbench/yycc/macro/version_cmp.cpp b/testbench/yycc/macro/version_cmp.cpp
new file mode 100644
index 0000000..d1bc89e
--- /dev/null
+++ b/testbench/yycc/macro/version_cmp.cpp
@@ -0,0 +1,31 @@
+#include <gtest/gtest.h>
+#include <yycc.hpp>
+#include <yycc/macro/version_cmp.hpp>
+
+namespace yycctest::macro::version_cmp {
+
+    TEST(MacroVersionCmp, Same) {
+        // Test for same version.
+        EXPECT_TRUE(YYCC_VERCMP_E(1, 2, 3, 1, 2, 3));
+        EXPECT_FALSE(YYCC_VERCMP_NE(1, 2, 3, 1, 2, 3));
+        EXPECT_FALSE(YYCC_VERCMP_G(1, 2, 3, 1, 2, 3));
+        EXPECT_TRUE(YYCC_VERCMP_GE(1, 2, 3, 1, 2, 3));
+        EXPECT_TRUE(YYCC_VERCMP_NL(1, 2, 3, 1, 2, 3));
+        EXPECT_FALSE(YYCC_VERCMP_L(1, 2, 3, 1, 2, 3));
+        EXPECT_TRUE(YYCC_VERCMP_LE(1, 2, 3, 1, 2, 3));
+        EXPECT_TRUE(YYCC_VERCMP_NG(1, 2, 3, 1, 2, 3));
+    }
+
+    TEST(MacroVersionCmp, Math) {
+        // In version number, 1.2.10 is greater than 1.2.9
+        EXPECT_FALSE(YYCC_VERCMP_E(1, 2, 10, 1, 2, 9));
+        EXPECT_TRUE(YYCC_VERCMP_NE(1, 2, 10, 1, 2, 9));
+        EXPECT_TRUE(YYCC_VERCMP_G(1, 2, 10, 1, 2, 9));
+        EXPECT_TRUE(YYCC_VERCMP_GE(1, 2, 10, 1, 2, 9));
+        EXPECT_TRUE(YYCC_VERCMP_NL(1, 2, 10, 1, 2, 9));
+        EXPECT_FALSE(YYCC_VERCMP_L(1, 2, 10, 1, 2, 9));
+        EXPECT_FALSE(YYCC_VERCMP_LE(1, 2, 10, 1, 2, 9));
+        EXPECT_FALSE(YYCC_VERCMP_NG(1, 2, 10, 1, 2, 9));
+    }
+
+}