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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _clear(cls):
 """This is only for testing pourposes, resets the DepotManager status This is to simplify writing test fixtures, resets the DepotManager global status and removes the informations related to the current configured depots and middleware. """

        cls._default_depot = None
        cls._depots = {}
        cls._middleware = None
        cls._aliases = {}