code: def test_ValidMutations(self) -> None:
      # updating constraint metric is ok as long as lower_is_better is compatible.
      self.threshold.metric = self.ambiguous_metric
      self.threshold.op = ComparisonOp.LEQ
      self.assertEqual(self.threshold.metric.name, "buz")
  
imports: from unittest import mock
  from ax.core.metric import Metric
  from ax.core.outcome_constraint import CONSTRAINT_WARNING_MESSAGE, LOWER_BOUND_MISMATCH, ObjectiveThreshold, OutcomeConstraint, ScalarizedOutcomeConstraint, UPPER_BOUND_MISMATCH
  from ax.core.types import ComparisonOp
  from ax.utils.common.testutils import TestCase
label_desc: Use image node_id 3 for calling the ObjectiveThresholdTest obj's underlying member method code with example usage: obj.test_ValidMutations() without return types