diff --git a/.vscode/settings.json b/.vscode/settings.json
index 6ce4f97..32f0e1c 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -19,9 +19,9 @@
         "args": [
         ]
     },
-    // "cmake.configureSettings": {
-	//     "CMAKE_TOOLCHAIN_FILE": "${env:VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake"
-    // },
+    "cmake.configureSettings": {
+	    "CMAKE_TOOLCHAIN_FILE": "${env:VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake"
+    },
     "cmake.options.statusBarVisibility": "visible",
     "cmake.generator": "Ninja",
     "C_Cpp.default.compileCommands": "${workspaceRoot}/build/compile_commands.json",
@@ -31,5 +31,57 @@
         "ja": true,
         "zh-hant": true,
         "zh-hans": true
+    },
+    "files.associations": {
+        "xstring": "cpp",
+        "algorithm": "cpp",
+        "chrono": "cpp",
+        "cmath": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "cstring": "cpp",
+        "ctime": "cpp",
+        "cwchar": "cpp",
+        "exception": "cpp",
+        "filesystem": "cpp",
+        "initializer_list": "cpp",
+        "iomanip": "cpp",
+        "ios": "cpp",
+        "iosfwd": "cpp",
+        "iostream": "cpp",
+        "istream": "cpp",
+        "limits": "cpp",
+        "list": "cpp",
+        "locale": "cpp",
+        "memory": "cpp",
+        "new": "cpp",
+        "ostream": "cpp",
+        "ratio": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "string": "cpp",
+        "string_view": "cpp",
+        "system_error": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "typeinfo": "cpp",
+        "utility": "cpp",
+        "vector": "cpp",
+        "xfacet": "cpp",
+        "xiosbase": "cpp",
+        "xlocale": "cpp",
+        "xlocbuf": "cpp",
+        "xlocinfo": "cpp",
+        "xlocmes": "cpp",
+        "xlocmon": "cpp",
+        "xlocnum": "cpp",
+        "xloctime": "cpp",
+        "xmemory": "cpp",
+        "xmemory0": "cpp",
+        "xstddef": "cpp",
+        "xtr1common": "cpp",
+        "xutility": "cpp"
     }
 }
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4eeb1f8..ecd1474 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,11 +11,14 @@ endif()
 message(STATUS "System: ${CMAKE_SYSTEM_NAME}")
 message(STATUS "Compiler CXX ID: ${CMAKE_CXX_COMPILER_ID}")
 
-set(SRC_FILES
-    include/of_path.h src/of_path.cpp
-    include/of_str.h src/of_str.cpp
-)
+# find_package(GTest CONFIG REQUIRED)
 
+set(SRC_FILES
+    src/of_path.cpp src/of_str.cpp
+)
 include_directories(include)
+
+add_subdirectory(test)
+
 add_library(Ofen STATIC ${SRC_FILES})
 target_include_directories(Ofen PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
\ No newline at end of file
diff --git a/include/of_def.hpp b/include/of_def.hpp
new file mode 100644
index 0000000..f51be16
--- /dev/null
+++ b/include/of_def.hpp
@@ -0,0 +1,14 @@
+#ifndef OFEN_DEFINE
+#define OFEN_DEFINE
+
+#include <string>
+
+#ifdef UNICODE_OFSTR
+using ofString = std::wstring;
+#define ofT(text) L##text
+#else
+using ofString = std::string;
+#define ofT(text) text
+#endif
+
+#endif
\ No newline at end of file
diff --git a/include/of_path.h b/include/of_path.h
index cf5196e..ed8fdd1 100644
--- a/include/of_path.h
+++ b/include/of_path.h
@@ -1,7 +1,7 @@
 #ifndef OFEN_PATH_HEADER
 #define OFEN_PATH_HEADER
 
-#include <string>
+#include "of_def.hpp"
 
 namespace ofen {
 class COfPath
@@ -11,7 +11,7 @@ public:
     ~COfPath();
 
 public:
-    static bool is_same_path(const std::string& pa, const std::string& pb);
+    static bool is_same_path(const ofString& pa, const ofString& pb);
 };
 };   // namespace ofen
 #endif
\ No newline at end of file
diff --git a/include/of_str.h b/include/of_str.h
index 3d82864..a684329 100644
--- a/include/of_str.h
+++ b/include/of_str.h
@@ -1,7 +1,7 @@
 #ifndef OFEN_STRING_HEADER
 #define OFEN_STRING_HEADER
 
-#include <string>
+#include "of_def.hpp"
 
 namespace ofen {
 class COfStr
diff --git a/src/of_path.cpp b/src/of_path.cpp
index 0577ad1..bec68e4 100644
--- a/src/of_path.cpp
+++ b/src/of_path.cpp
@@ -11,7 +11,7 @@ COfPath::~COfPath()
 {
 }
 
-bool COfPath::is_same_path(const std::string& pa, const std::string& pb)
+bool COfPath::is_same_path(const ofString& pa, const ofString& pb)
 {
     return false;
 }
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 0000000..d5a60fd
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.16)
+
+project(ofen LANGUAGES CXX)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+if (MSVC)
+    add_compile_options(/source-charset:utf-8)
+endif()
+
+
+add_executable(ofTest main.cpp)
+target_link_libraries(ofTest PRIVATE Ofen)
\ No newline at end of file