code: def testInvalidScale(self):
      scale = [-0.01, 0.0, 2.0]
      with self.assertRaisesOpError(
          "Argument `scale` must be positive."
      ):
          dsmaxwell = doublesided_maxwell.DoublesidedMaxwell(
              loc=0.0, scale=scale, validate_args=True
          )
          self.evaluate(dsmaxwell.scale)
  
file_path: probability/tensorflow_probability/python/distributions/doublesided_maxwell_test.py
imports: from absl.testing import parameterized
  import numpy
  from scipy import stats
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions import doublesided_maxwell
  from tensorflow_probability.python.internal import test_util
label_desc: Use image node_id 6 for calling the DoublesidedMaxwellTest obj's underlying member method code with example usage: obj.testInvalidScale() without return types