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diff --git a/testcases/Controllers/ODL/CI/libraries/Common.py b/testcases/Controllers/ODL/CI/libraries/Common.py
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+"""
+Library for the robot based system test tool of the OpenDaylight project.
+Authors: Baohua Yang@IBM, Denghui Huang@IBM
+Updated: 2013-11-14
+"""
+import collections
+import xml.etree.ElementTree as ET
+
+'''
+Common constants and functions for the robot framework.
+'''
+
+def collection_should_contain(collection, *members):
+    """
+    Fail if not every members is in the collection.
+    """
+    if not isinstance(collection, collections.Iterable):
+        return False
+    for m in members:
+        if m not in collection:
+            return False
+    else:
+        return True
+
+def combine_strings(*strings):
+    """
+    Combines the given `strings` together and returns the result.
+    The given strings are not altered by this keyword.
+    """
+    result = ''
+    for s in strings:
+        if isinstance(s,str) or isinstance(s,unicode):
+            result += s
+    if result == '':
+        return None
+    else:
+        return result
+
+        
+def compare_xml(xml1, xml2):
+    """
+    compare the two XML files to see if they contain the same data
+    but could be if different order.
+    It just split the xml in to lines and just check the line is in
+    the other file 
+    """
+    for line in xml1.rstrip().split('\n'):
+        if line not in xml2.rstrip().split('\n'):
+            return False
+
+    for line in xml2.rstrip().split('\n'):
+        if line not in xml1.rstrip().split('\n'):
+            return False
+
+    return True
+
+def num_of_nodes(depth, fanout):
+    '''returns num of switches of a mininet with tree topology 
+    with particular depth and fanout parameters
+    '''
+    result = 0
+    for i in xrange(depth):
+        result += fanout**i
+    return result    
+
+def num_of_links_for_node(nodeid, leaflist, fanout):
+    '''
+    If the given node is a leaf node, there will be an only one link for it
+    and nodeid will be represented 2 times in topology
+    If the given node is not a leaf node, then there will be fanout+1 links
+    for it and nodeid will be represented (fanout+1)*2 times in topology
+    
+    p.s. root node is excluded.
+    '''
+    if nodeid in leaflist:
+        return 1
+    return (fanout+1)
+
+if __name__ == '__main__':
+	print num_of_nodes(3,4)
+	pass