code: def testCdfBeyondSupport(self):
      negbinom = negative_binomial.NegativeBinomial(
          total_count=5.0, probs=0.7, validate_args=False
      )
      cdf = self.evaluate(negbinom.cdf(-1.0))
      self.assertEqual(0, cdf)
  
imports: import numpy
  from scipy import stats
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions import negative_binomial
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.math import gradient
label_desc: Use image node_id 10 for calling the NegativeBinomialTest obj's underlying member method code with example usage: obj.testCdfBeyondSupport() without return types