diff --git a/python/qa_message_source_sink.py b/python/qa_message_source_sink.py
new file mode 100755
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+++ b/python/qa_message_source_sink.py
@@ -0,0 +1,80 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# @file
+# @author Roman Khassraf <rkhassraf@gmail.com>
+# @section LICENSE
+# 
+# Gr-gsm is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+# 
+# Gr-gsm is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with gr-gsm; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+# 
+
+from gnuradio import gr, gr_unittest, blocks
+import grgsm
+import os
+import pmt
+import sys
+import tempfile
+
+class qa_message_source_sink (gr_unittest.TestCase):
+   
+    def setUp (self):
+        self.tb = gr.top_block()
+        self.tmpfile = tempfile.NamedTemporaryFile()
+                
+    def tearDown (self):
+        self.tmpfile.close()
+        
+    #def getOutput(self):
+        #self.tmpfile.seek(0)
+        #return self.tmpfile.read()
+    
+    #def getOutputExpected(self, expected_lines):
+        #out = ""
+        #for l in expected_lines:
+            #out = out + l + "\n"
+        #return out
+
+    def test_001_no_prefix_no_header (self):
+        """
+            Four messages, without any prefix, no gsmtap header
+        """
+        msgs_input = [
+            "02 04 01 00 00 00 c9 00 00 1d 3c e5 02 00 01 00 15 06 21 00 01 f0 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b",
+            #"02 04 01 00 00 00 ca 00 00 1d 3c e9 02 00 02 00 15 06 21 00 01 f0 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b",
+            #"02 04 01 00 00 00 cb 00 00 1d 3d 0e 01 00 00 00 59 06 1a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff e5 04 00",
+            #"02 04 01 00 00 00 cb 00 00 1d 3d 12 02 00 00 00 15 06 21 00 01 f0 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b"
+        ]
+        
+        # there is a whitespace at the beginning of message_printer output
+        msgs_expected = [
+            "02 04 01 00 00 00 c9 00 00 1d 3c e5 02 00 01 00 15 06 21 00 01 f0 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b",
+            #"02 04 01 00 00 00 ca 00 00 1d 3c e9 02 00 02 00 15 06 21 00 01 f0 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b",
+            #" 59 06 1a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff e5 04 00",
+            #" 15 06 21 00 01 f0 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b"
+        ]
+        
+        src = grgsm.message_source(msgs_input)
+        file_sink = grgsm.message_file_sink(self.tmpfile.name)
+        
+        #printer = grgsm.message_printer(pmt.intern(""), False)
+        #self.tb.msg_connect(src, "msgs", printer, "msgs")
+        self.tb.run()
+
+        #self.assertEqual(self.getOutput(), self.getOutputExpected(msgs_expected))
+       
+        
+if __name__ == '__main__':
+    gr_unittest.run(qa_message_source_sink, "qa_message_source_sink.xml")