code: def testValidateArgs(self):
      with self.assertRaisesOpError("must be positive"):
          k = parabolic.Parabolic(-1.0, 1.0, validate_args=True)
          self.evaluate(k.apply([1.0], [1.0]))
  
      with self.assertRaisesOpError("must be positive"):
          parabolic.Parabolic(2.0, -2.0, validate_args=True)
          self.evaluate(k.apply([1.0], [1.0]))
  
      # But `None`'s are ok
      k = parabolic.Parabolic(None, None, validate_args=True)
      self.evaluate(k.apply([1.0], [1.0]))
  
file_path: probability/tensorflow_probability/python/math/psd_kernels/parabolic_test.py
imports: from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.math.psd_kernels import parabolic
label_desc: Use image node_id 6 for calling the ParabolicTest obj's underlying member method code with example usage: obj.testValidateArgs() without return types