diff --git a/src/utilities/feedfile.py b/src/utilities/feedfile.py
index 5bf78f5..95c7f41 100644
--- a/src/utilities/feedfile.py
+++ b/src/utilities/feedfile.py
@@ -2,7 +2,7 @@ __author__ = 'stubbfel'
 
 import feedparser
 from utilities.textfile import TextFile
-
+from utilities.serializer import Serializer
 
 class FeedFile(TextFile):
 
@@ -21,11 +21,18 @@ class FeedFile(TextFile):
         feed_str = self.read_text_file()
         return feedparser.parse(feed_str)
 
-    def write_feed_file(self, feed, serializer):
+    def write_feed_file(self, feed, serializer=None):
+        """
+        method write a feedparpser object to a text file. It use a certain serializer or the default serializer
+        if type of the serializer is none
+        :param feed: expetc FeedparserDict
+        :param serializer: None or a subclass of Serializer
+        """
         assert isinstance(feed, feedparser.FeedParserDict)
 
         if serializer is None:
-            feed_string = str(feed)
+            serializer = Serializer()
+            feed_string = serializer.serialize(feed)
         else:
             feed_string = serializer.toString(feed)
         self.write_text_file(feed_string)
\ No newline at end of file
diff --git a/src/utilities/serializer.py b/src/utilities/serializer.py
new file mode 100644
index 0000000..e8728fc
--- /dev/null
+++ b/src/utilities/serializer.py
@@ -0,0 +1,14 @@
+__author__ = 'stubbfel'
+
+
+class Serializer():
+
+    def serialize(self, dict_object):
+        """
+        method convert i dict to a string.
+        this method should be override by any subclasses
+        :param dict_object: object wich his to bee convert to a string
+        :return: rhe string reprasention of the dict_object
+        """
+        assert isinstance(dict_object, dict)
+        return  str(dict_object)
\ No newline at end of file
diff --git a/testenv/tests/utilities/testfeedfile.py b/testenv/tests/utilities/testfeedfile.py
index 735c436..8f9a555 100644
--- a/testenv/tests/utilities/testfeedfile.py
+++ b/testenv/tests/utilities/testfeedfile.py
@@ -5,7 +5,7 @@ import feedparser
 from utilities.feedfile import FeedFile
 
 
-class MyTestCase(unittest.TestCase):
+class FeedUtilitiesTest(unittest.TestCase):
     def setUp(self):
         self.__ff = FeedFile("testfeeds/rss/feed.xml")
 
diff --git a/testenv/tests/utilities/testserializer.py b/testenv/tests/utilities/testserializer.py
new file mode 100644
index 0000000..1bb8fe5
--- /dev/null
+++ b/testenv/tests/utilities/testserializer.py
@@ -0,0 +1,28 @@
+__author__ = 'stubbfel'
+
+import unittest
+from utilities.serializer import Serializer
+
+
+class SerializerUtilitiesTest(unittest.TestCase):
+
+    def setUp(self):
+        self.__testdict = {"test": "1234", "0815": "Hallo Welt"}
+        self.__serializer = Serializer()
+
+    def test_serialize(self):
+        test_string = self.__serializer.serialize(self.__testdict)
+        test_string2 = str(self.__testdict)
+        self.assertEqual(test_string, test_string2)
+
+    def test_serialize_error_not_equal(self):
+        test_string = self.__serializer.serialize(self.__testdict)
+        test_string2 = ""
+        self.assertNotEqual(test_string, test_string2)
+
+    def test_serialize_error_raise_assert(self):
+        self.assertRaises(AssertionError, self.__serializer.serialize, "")
+
+
+if __name__ == '__main__':
+    unittest.main()