'Duplicates the source, parenting to supplied parent. Then does equality check.'

def _duplicate_and_verify(self, source_usage_key, parent_usage_key, check_asides=False):

    usage_key = self._duplicate_item(parent_usage_key, source_usage_key)
    self.assertTrue(self._check_equality(source_usage_key, usage_key, parent_usage_key, check_asides=check_asides), 'Duplicated    item    differs    from    original')
