def METHOD_NAME(self):
    custom_block_key = self.context_key.make_usage_key(block_type='custom_scorable', block_id='green')
    self.call_scorable_block_completion_handler(custom_block_key)
    completion = BlockCompletion.objects.filter(
        user=self.user,
        context_key=self.context_key,
        block_key=custom_block_key,
    )
    assert not completion.exists()