def embed_seqdiag_sequence(self):
test_name = BuiltIn().replace_variables('<STR_LIT>')<EOL>outputdir = BuiltIn().replace_variables('<STR_LIT>')<EOL>path = os.path.join(outputdir, test_name + '<STR_LIT>')<EOL>SeqdiagGenerator().compile(path, self._message_sequence)<EOL>
Create a message sequence diagram png file to output folder and embed the image to log file.

        You need to have seqdiag installed to create the sequence diagram. See http://blockdiag.com/en/seqdiag/