diff --git a/pzztest.py b/pzztest.py
new file mode 100644
index 0000000..d496d85
--- /dev/null
+++ b/pzztest.py
@@ -0,0 +1,41 @@
+import argparse
+import pzztool
+import hashlib
+import os
+
+
+def argparser():
+    parser = argparse.ArgumentParser(description='TEST TOOL')
+    parser.add_argument('input_path',  metavar='INPUT',  help='')
+    return parser.parse_args()
+
+
+if __name__ == '__main__':
+    listofinvalid = []
+    args = argparser()
+
+    for filename in os.listdir(args.input_path):
+        file = open(os.path.join(args.input_path, filename), 'rb')
+        original_bytes = file.read()
+        decomp_bytes = pzztool.pzz_decompress(original_bytes)
+        recomp_bytes = pzztool.pzz_compress(decomp_bytes)
+
+        original_digest = hashlib.sha256(original_bytes).hexdigest()
+        recomp_digest = hashlib.sha256(recomp_bytes).hexdigest()
+
+        if original_digest != recomp_digest:
+            listofinvalid.append(f"{filename} : ({original_digest}) ({recomp_digest})")
+        file.close()
+
+    for invalid in listofinvalid:
+        print(invalid)
+    
+    """
+        Code pour le developement --> pzztool.py -a a
+        compare le sha256 de chaque PZZ du dossier pzz et pzz2 puis affiche le nom de fichier en cas de différence
+    import hashlib
+    for pzz_file in listdir("pzz"):
+        with open("pzz/"+pzz_file, "rb") as f1, open("pzz2/"+pzz_file, "rb") as f2:
+            if hashlib.sha256( f1.read() ).hexdigest() != hashlib.sha256( f2.read() ).hexdigest() :
+                print(pzz_file)
+    """