import unittest
from xmltestcase import XMLTestCase

class MessageTransformer:
    def __init__(self, msg) :
        self.message = msg
        
    def transform(self) :
        # let's imagine that an XML manipulation happens here
        # and the result is: "<message>Hello World!</message>"
        return "<message>Hello World!</message>"

class TestMessageTransformer(XMLTestCase):
        
    def testMessageIsTransformed(self):
        transformer = MessageTransformer("<message>Say hello...</message>")
        self.assertXMLEqual("<message>Hello World!</message>", transformer.transform())

if __name__ == '__main__':
    unittest.main()