code: def testNegativeScaleFails(self):
      with self.assertRaisesOpError("`scale` must be positive"):
          dist = truncated_cauchy.TruncatedCauchy(
              loc=0.0,
              scale=-0.1,
              low=-1.0,
              high=1.0,
              validate_args=True,
          )
          self.evaluate(dist.mode())
  
file_path: probability/tensorflow_probability/python/distributions/truncated_cauchy_test.py
imports: from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions import cauchy
  from tensorflow_probability.python.distributions import truncated_cauchy
  from tensorflow_probability.python.internal import test_util
label_desc: Use image node_id 9 for calling the TruncatedCauchyTest obj's underlying member method code with example usage: obj.testNegativeScaleFails() without return types