code: def test_invalid_pre_threshold(self, pre_threshold):
      with self.assertRaisesRegex(
          ValueError, "pre_threshold has to be positive integer"
      ):
          pipeline_dp.SelectPartitionsParams(
              max_partitions_contributed=1, pre_threshold=pre_threshold
          )
  
imports: from absl.testing import parameterized
  import pipeline_dp
  from pipeline_dp import budget_accounting, aggregate_params
label_desc: Use image node_id 1 for calling the SelectPartitionsParamsTest obj's underlying member method code with example usage: obj.test_invalid_pre_threshold(pre_threshold) without return types