diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3c9bbeb..8498ca1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,6 +27,9 @@ cm_example_project("DataType" CollectionTest)
 add_executable(SplitStringTest datatype/SplitStringTest.cpp)
 cm_example_project("DataType" SplitStringTest)
 
+add_executable(StrChrTest datatype/strchr_test.cpp)
+cm_example_project("DataType" StrChrTest)
+
 add_executable(MultiMapTest datatype/MultiMapTest.cpp)
 cm_example_project("DataType" MultiMapTest)
 
diff --git a/datatype/strchr_test.cpp b/datatype/strchr_test.cpp
new file mode 100644
index 0000000..f26a605
--- /dev/null
+++ b/datatype/strchr_test.cpp
@@ -0,0 +1,43 @@
+#include<hgl/type/String.h>
+#include<hgl/filesystem/FileSystem.h>
+#include<iostream>
+
+void out(const char *source,const char *result)
+{
+    std::cout<<source<<" return \""<<result<<"\""<<std::endl;
+}
+
+void out(const char *source,const hgl::UTF8String &param,const hgl::UTF8String &result)
+{
+    std::cout<<source<<"(\""<<param.c_str()<<"\") return \""<<result.c_str()<<"\""<<std::endl;
+}
+
+int main(int,char **)
+{
+    constexpr char str[]="hello,world!";
+
+    std::cout<<"str: \""<<str<<"\""<<std::endl;
+
+    out("strchr(str,',')",hgl::strchr(str,','));
+    out("strrchr(str,strlen(str),',')",hgl::strrchr(str,hgl::strlen(str),','));
+
+    out("strchr(str,\"el\",2)",hgl::strchr(str,"el",2));
+    out("strrchr(str,strlen(str),\"el\",2)",hgl::strrchr(str,hgl::strlen(str),"el",2));
+
+    out("strrchr(str,strlen(str),3,'l')",hgl::strrchr(str,hgl::strlen(str),3,'l'));
+    out("strrchr(str,strlen(str),3,\"el\",2)",hgl::strrchr(str,hgl::strlen(str),3,"el",2));
+
+    hgl::UTF8String fn("C:\\1.txt");
+
+    out("ClipFilename",fn,hgl::filesystem::ClipFilename(fn));
+
+    hgl::UTF8String tp1("C:\\1\\2");
+    hgl::UTF8String tp2("C:\\1\\2\\");
+    hgl::UTF8String tp3("C:\\1\\2\\\\");
+
+    out("ClipLastPathname",tp1,hgl::filesystem::ClipLastPathname(tp1));
+    out("ClipLastPathname",tp2,hgl::filesystem::ClipLastPathname(tp2));
+    out("ClipLastPathname",tp3,hgl::filesystem::ClipLastPathname(tp3));
+
+    return 0;
+}