'Restores the stdout & stderr, and returns both
output strings'

def unmock_io(self):

    sys.stdout = self.orig_stdout
    sys.stderr = self.orig_stderr
    values = (self.mock_streams_stdout.getvalue(), self.mock_streams_stderr.getvalue())
    self.mock_streams_stdout.close()
    self.mock_streams_stderr.close()
    return values
