diff --git a/.travis.yml b/.travis.yml
index 3dda419..95b7787 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,5 +16,5 @@ install:
   - scons -C rdpy/core install
 
 script:
-  - python -m unittest discover -s test
+  - python -m unittest discover -s test -v
 
diff --git a/rdpy/protocol/rdp/per.py b/rdpy/protocol/rdp/per.py
index e9f843d..b92527d 100644
--- a/rdpy/protocol/rdp/per.py
+++ b/rdpy/protocol/rdp/per.py
@@ -1,16 +1,35 @@
-'''
-@author: sylvain
-'''
+#
+# Copyright (c) 2014 Sylvain Peyrefitte
+#
+# This file is part of rdpy.
+#
+# rdpy 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 of the License, or
+# (at your option) any later version.
+#
+# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+Per encoded function
+"""
 
 from rdpy.network.type import UInt8, UInt16Be, UInt32Be, String
 from rdpy.base.error import InvalidValue, InvalidExpectedDataException
 
 def readLength(s):
-    '''
-    read length use in per specification
+    """
+    @summary: read length use in per specification
     @param s: Stream
     @return: int python
-    '''
+    """
     byte = UInt8()
     s.readType(byte)
     size = 0
@@ -24,95 +43,95 @@ def readLength(s):
     return size
 
 def writeLength(value):
-    '''
-    write length as expected in per specification
+    """
+    @summary: write length as expected in per specification
     @param value: int or long python
     @return: UInt8, UInt16Be depend on value
-    '''
+    """
     if value > 0x7f:
         return UInt16Be(value | 0x8000)
     else:
         return UInt8(value)
     
 def readChoice(s):
-    '''
-    read per choice format
+    """
+    @summary: read per choice format
     @param s: Stream
     @return: int that represent choice
-    '''
+    """
     choice = UInt8()
     s.readType(choice)
     return choice.value
 
 def writeChoice(choice):
-    '''
-    read per choice structure
+    """
+    @summary: read per choice structure
     @param choice: int choice value
     @return: UInt8
-    '''
+    """
     return UInt8(choice)
 
 def readSelection(s):
-    '''
-    read per selection format
+    """
+    @summary: read per selection format
     @param s: Stream
     @return: int that represent selection
-    '''
+    """
     choice = UInt8()
     s.readType(choice)
     return choice.value
 
 def writeSelection(selection):
-    '''
-    read per selection structure
+    """
+    @summary: read per selection structure
     @param selection: int selection value
     @return: UInt8
-    '''
+    """
     return UInt8(selection)
 
 def readNumberOfSet(s):
-    '''
-    read per numberOfSet format
+    """
+    @summary: read per numberOfSet format
     @param s: Stream
     @return: int that represent numberOfSet
-    '''
+    """
     choice = UInt8()
     s.readType(choice)
     return choice.value
 
 def writeNumberOfSet(numberOfSet):
-    '''
-    read per numberOfSet structure
+    """
+    @summary: read per numberOfSet structure
     @param numberOfSet: int numberOfSet value
     @return: UInt8
-    '''
+    """
     return UInt8(numberOfSet)
 
 def readEnumerates(s):
-    '''
-    read per enumerate format
+    """
+    @summary: read per enumerate format
     @param s: Stream
     @return: int that represent enumerate
-    '''
+    """
     choice = UInt8()
     s.readType(choice)
     return choice.value
 
 def writeEnumerates(enumer):
-    '''
-    read per enumerate structure
+    """
+    @summary: read per enumerate structure
     @param enumer: int enumerate value
     @return: UInt8
-    '''
+    """
     return UInt8(enumer)
 
 def readInteger(s):
-    '''
-    read interger per format from stream
+    """
+    @summary: read interger per format from stream
     @param s: Stream
     @return: python int or long
     @raise InvalidValue: if size of integer is not correct
-    '''
+    """
     result = None
     size = readLength(s)
     if size == 1:
@@ -127,11 +146,11 @@ def readInteger(s):
     return result.value
 
 def writeInteger(value):
-    '''
-    write python long or int into per integer format
+    """
+    @summary: write python long or int into per integer format
     @param value: int or long python value
     @return: UInt8, UInt16Be or UInt32Be
-    '''
+    """
     if value <= 0xff:
         return (writeLength(1), UInt8(value))
     elif value < 0xffff:
@@ -140,32 +159,32 @@ def writeInteger(value):
         return (writeLength(4), UInt32Be(value))
     
 def readInteger16(s, minimum = 0):
-    '''
-    read UInt16Be from stream s and add minimum
+    """
+    @summary: read UInt16Be from stream s and add minimum
     @param s: Stream
     @param minimum: minimum added to real value
     @return: int or long python value
-    '''
+    """
     result = UInt16Be()
     s.readType(result)
     return result.value + minimum
 
 def writeInteger16(value, minimum = 0):
-    '''
-    write UInt16Be minus minimum
+    """
+    @summary: write UInt16Be minus minimum
     @param value: value to write
     @param minimum: value subtracted to real value
     @return: UInt16Be
-    '''
+    """
     return UInt16Be(value - minimum)
 
 def readObjectIdentifier(s, oid):
-    '''
-    read object identifier
+    """
+    @summary: read object identifier
     @param oid: must be a tuple of 6 elements
     @param s: Stream
     @return: true if oid is same as in stream
-    '''
+    """
     size = readLength(s)
     if size != 5:
         raise InvalidValue("size of stream oid is wrong %d != 5"%size)
@@ -188,7 +207,7 @@ def readObjectIdentifier(s, oid):
 
 def writeObjectIdentifier(oid):
     """
-    Create tuple of 6 UInt8 with oid values
+    @summary: Create tuple of 6 UInt8 with oid values
     @param oid: tuple of 6 int
     @return: (UInt8, UInt8, UInt8, UInt8, UInt8, UInt8, UInt8)
     """
@@ -196,7 +215,7 @@ def writeObjectIdentifier(oid):
 
 def readNumericString(s, minValue):
     """
-    Read numeric string
+    @summary: Read numeric string
     @param s: Stream
     @param minValue: offset
     """
@@ -205,12 +224,12 @@ def readNumericString(s, minValue):
     s.read(length)
 
 def writeNumericString(nStr, minValue):
-    '''
-    write string in per format
+    """
+    @summary: write string in per format
     @param str: python string to write
     @param min: min value
     @return: String type that contain str encoded in per format
-    '''
+    """
     length = len(nStr)
     mlength = minValue
     if length - minValue >= 0:
@@ -232,29 +251,29 @@ def writeNumericString(nStr, minValue):
     return (writeLength(mlength), tuple(result))
 
 def readPadding(s, length):
-    '''
-    read length byte in stream
+    """
+    @summary: read length byte in stream
     @param s: Stream
     @param length: length of passing in bytes
-    '''
+    """
     s.read(length)
 
 def writePadding(length):
-    '''
-    create string with null char * length
+    """
+    @summary: create string with null char * length
     @param length: length of padding
     @return: String with \x00 * length
-    '''
+    """
     return String("\x00"*length)
 
 def readOctetStream(s, octetStream, minValue = 0):
-    '''
-    read string as octet stream and compare with octetStream
+    """
+    @summary: read string as octet stream and compare with octetStream
     @param octetStream: compare stream
     @param s: Stream
     @param minValue: min value
     @return: if stream read from s is equal to octetStream
-    '''
+    """
     size = readLength(s) + minValue
     if size != len(octetStream):
         raise InvalidValue("incompatible size %d != %d"(len(octetStream), size))
@@ -267,12 +286,12 @@ def readOctetStream(s, octetStream, minValue = 0):
     return True
 
 def writeOctetStream(oStr, minValue = 0):
-    '''
-    write string as octet stream with per header
+    """
+    @summary: write string as octet stream with per header
     @param oStr: octet stream to convert
     @param minValue: min length value
     @return: per header follow by tuple of UInt8
-    '''
+    """
     length = len(oStr)
     mlength = minValue
     
diff --git a/test/test_protocol_rdp_ber.py b/test/test_protocol_rdp_ber.py
new file mode 100644
index 0000000..f50bac9
--- /dev/null
+++ b/test/test_protocol_rdp_ber.py
@@ -0,0 +1,80 @@
+#
+# Copyright (c) 2014 Sylvain Peyrefitte
+#
+# This file is part of rdpy.
+#
+# rdpy 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 of the License, or
+# (at your option) any later version.
+#
+# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+unit test for rdpy.protocol.rdp.ber module
+"""
+
+import os, sys
+# Change path so we find rdpy
+sys.path.insert(1, os.path.join(sys.path[0], '..'))
+
+import unittest
+import rdpy.protocol.rdp.ber as ber
+import rdpy.network.type as type
+import rdpy.base.error as error
+
+class BERCase(unittest.TestCase):
+    """
+    @summary: test case for ber layer (RDP)
+    """
+    
+    def test_ber_readLength(self):
+        """
+        @summary: test readLength function in ber module
+        """
+        s1 = type.Stream()
+        s1.writeType(type.UInt8(0x1a))
+        s1.pos = 0
+        
+        l1 = ber.readLength(s1)
+        
+        self.assertTrue(l1 == 0x1a, "readLength fail in small format")
+        
+        s2 = type.Stream()
+        s2.writeType((type.UInt8(0x81),type.UInt8(0xab)))
+        s2.pos = 0
+        
+        l2 = ber.readLength(s2)
+        
+        self.assertTrue(l2 == 0xab, "readLength fail in big format of size 1")
+        
+        s3 = type.Stream()
+        s3.writeType((type.UInt8(0x82),type.UInt16Be(0xabab)))
+        s3.pos = 0
+        
+        l3 = ber.readLength(s3)
+        
+        self.assertTrue(l3 == 0xabab, "readLength fail in big format of size 2")
+
+    def test_ber_writeLength(self):
+        """
+        @summary: test writeLength function in ber module
+        """
+        l1 = ber.writeLength(0x1a)
+        self.assertTrue(isinstance(l1, type.UInt8), "bad write length type in small case")
+        
+        l2 = ber.writeLength(0x7f)
+        self.assertTrue(isinstance(l2, type.UInt8), "bad write length type in small case limit")
+        
+        (h3, l3) = ber.writeLength(0x80)
+        self.assertTrue(h3.value == 0x82 and isinstance(l3, type.UInt16Be), "bad write length type in large case limit")
+        
+        (h4, l4) = ber.writeLength(0xab)
+        self.assertTrue(h4.value == 0x82 and isinstance(l4, type.UInt16Be), "bad write length type in large case")
\ No newline at end of file
diff --git a/test/test_protocol_rdp_per.py b/test/test_protocol_rdp_per.py
new file mode 100644
index 0000000..e1e65c4
--- /dev/null
+++ b/test/test_protocol_rdp_per.py
@@ -0,0 +1,107 @@
+#
+# Copyright (c) 2014 Sylvain Peyrefitte
+#
+# This file is part of rdpy.
+#
+# rdpy 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 of the License, or
+# (at your option) any later version.
+#
+# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+unit test for rdpy.protocol.rdp.per module
+"""
+
+import os, sys
+# Change path so we find rdpy
+sys.path.insert(1, os.path.join(sys.path[0], '..'))
+
+import unittest
+import rdpy.protocol.rdp.per as per
+import rdpy.network.type as type
+import rdpy.base.error as error
+
+class PERCase(unittest.TestCase):
+    """
+    @summary: test case for per layer (RDP)
+    """
+    
+    def test_per_readLength(self):
+        """
+        @summary: test readLength function in per module
+        """
+        s1 = type.Stream()
+        s1.writeType(type.UInt8(0x1a))
+        s1.pos = 0
+        
+        l1 = per.readLength(s1)
+        
+        self.assertTrue(l1 == 0x1a, "readLength fail in small format")
+        
+        s2 = type.Stream()
+        s2.writeType(type.UInt16Be(0x1abc | 0x8000))
+        s2.pos = 0
+        
+        l2 = per.readLength(s2)
+        
+        self.assertTrue(l2 == 0x1abc, "readLength fail in big format")
+        
+    def test_per_writeLength(self):
+        """
+        @summary: test writeLength function in per module
+        """
+        l1 = per.writeLength(0x1a)
+        self.assertTrue(isinstance(l1, type.UInt8), "bad write length type in small case")
+        
+        l2 = per.writeLength(0x7f)
+        self.assertTrue(isinstance(l2, type.UInt8), "bad write length type in small case limit")
+        
+        l3 = per.writeLength(0x80)
+        self.assertTrue(isinstance(l3, type.UInt16Be), "bad write length type in large case limit")
+        
+        l4 = per.writeLength(0xab)
+        self.assertTrue(isinstance(l4, type.UInt16Be), "bad write length type in large case")
+        
+    def test_per_readInteger(self):
+        """
+        @summary: test readInteger function in per module
+        """
+        for t in [type.UInt8, type.UInt16Be, type.UInt32Be]:
+            v = t(3)
+            s = type.Stream()
+            s.writeType((per.writeLength(type.sizeof(v)), v))
+            s.pos = 0
+            
+            self.assertTrue(per.readInteger(s) == 3, "invalid readLength for type %s"%t)
+        
+        #error case
+        for l in [0, 3, 5]:
+            s = type.Stream()
+            s.writeType(per.writeLength(l))
+            s.pos = 0
+            
+            self.assertRaises(error.InvalidValue, per.readInteger, s)
+            
+    def test_per_writeInteger(self):
+        """
+        @summary: test writeInteger function in per module
+        """
+        (s, i) = per.writeInteger(0xaf)
+        self.assertTrue(s.value == 1 and isinstance(i, type.UInt8), "invalid writeLength output in case of size 1")
+        
+        (s, i) = per.writeInteger(0xaff)
+        self.assertTrue(s.value == 2 and isinstance(i, type.UInt16Be), "invalid writeLength output in case of size 2")
+        
+        (s, i) = per.writeInteger(0xaffff)
+        self.assertTrue(s.value == 4 and isinstance(i, type.UInt32Be), "invalid writeLength output in case of size 4")
+        
+    
\ No newline at end of file