diff --git a/.gitignore b/.gitignore
index c268c65..3ac3b64 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,9 @@
 # Output binaries and folders
 /output/
 
+# test folder
+/test/
+
 # CMake files
 CMakeFiles/
 CMakeCache.txt
@@ -26,4 +29,4 @@ Makefile
 *.out
 
 # Generated recreator files (optional, if you want to ignore them)
-_*.[ch]pp 
\ No newline at end of file
+_*.[ch]pp 
diff --git a/build_arm64/dehydrate b/build_arm64/dehydrate
index a10e4b3..4a3e46c 100755
Binary files a/build_arm64/dehydrate and b/build_arm64/dehydrate differ
diff --git a/src/generator.cpp b/src/generator.cpp
index db5088f..40d6676 100644
--- a/src/generator.cpp
+++ b/src/generator.cpp
@@ -118,7 +118,28 @@ void generate_folder_code(const std::string& source, const std::string& destfold
     walk_dir(src, [&](const fs::path& p) { files.push_back(p); });
     // Write HPP
     std::ofstream hpp(dest / hppname);
-    hpp << "#pragma once\n#include <string>\nnamespace " << ns << " {\nbool recreate_tree(std::string destination_folder);\n}\n";
+
+    // -------------------------------------------------------------------------
+    // Generate HPP
+    hpp << R"hpp(
+#pragma once
+
+/*
+
+   THIS FILE IS AUTO-GENERATED BY DEHYDRATE.
+   DO NOT EDIT THIS FILE.
+
+*/
+
+
+#include <string>
+namespace )hpp" << ns << R"hpp( {
+    bool recreate_tree(std::string destination_folder);
+}
+)hpp";
+
+
+    // -------------------------------------------------------------------------
     // Write CPP
     std::ofstream cpp(dest / cppname);
     cpp << R"cpp(#include <fstream>
@@ -126,9 +147,34 @@ void generate_folder_code(const std::string& source, const std::string& destfold
 #include <string>
 #include <iostream>
 #include <iomanip>
+
+
+
+/*
+
+   THIS FILE IS AUTO-GENERATED BY DEHYDRATE.
+   DO NOT EDIT THIS FILE.
+
+*/
+
+
 )cpp";
     cpp << "#include \"" << hppname << "\"\n";
     cpp << "namespace " << ns << " {\n";
+
+    cpp << R"cpp(
+
+// Tiny dependency-free FNV-1a 64-bit hash
+static uint64_t fnv1a_64(const void* data, size_t len) {
+    const uint8_t* p = static_cast<const uint8_t*>(data);
+    uint64_t h = 0xcbf29ce484222325ULL;
+    for (size_t i = 0; i < len; ++i)
+        h = (h ^ p[i]) * 0x100000001b3ULL;
+    return h;
+}
+
+)cpp";
+
     // Embed all files
     for (const auto& file : files) {
         std::ifstream in(file, std::ios::binary);
diff --git a/test.sh b/test.sh
new file mode 100755
index 0000000..ab2293a
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+set -e
+
+SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+
+TEST_DIR="$SCRIPT_DIR/test"
+
+rm -rf $TEST_DIR
+mkdir $TEST_DIR
+
+#"$SCRIPT_DIR/build.sh"
+ 
+"$SCRIPT_DIR/output/dehydrate.amd64" src $TEST_DIR
+
+cat <<EOF > test/main.cpp
+#include "_src.hpp"
+
+#include <string>
+#include <filesystem>
+
+int main() {
+// get the current path to this executable
+    std::filesystem::path exepath= std::filesystem::canonical("/proc/self/exe");
+    recreate_src::recreate_tree(exepath.parent_path().string()+"/temp");
+    return 0;
+}
+EOF
+
+g++ -std=c++17 -I $TEST_DIR -o $TEST_DIR/testexe $TEST_DIR/main.cpp $TEST_DIR/_src.cpp
+
+$TEST_DIR/testexe
+
+$TEST_DIR/testexe
+