'Format of result dict.
result = {
\'result\' : "PASS" / "FAIL",
\'name\'   : class name,
\'args\'   : test\'s args,
\'kargs\'  : test\'s kargs,
\'output\' : return of test function,
:param result: Result of test.'

@staticmethod
def result_to_string(result):

    return ('Subtest    (%(name)s):    -->    %(result)s' % result)
