docstr: Error is triggered if skip < 0.
docstr_tok: ["Error","is","triggered","if","skip","<","0","."]
code: def test_skip_should_be_non_negative(self):
      """Error is triggered if skip < 0."""
      with self.assertRaises(tf.errors.InvalidArgumentError):
          self.evaluate(
              random.sobol.sample(2, 5, skip=-10, validate_args=True)
          )
  
file_path: tf-quant-finance/tf_quant_finance/math/random_ops/sobol/sobol_test.py
imports: import numpy
  import tensorflow.compat.v2
  import tensorflow_probability
  from tensorflow.python.framework import test_util
  from tf_quant_finance.math import random
label_desc: Use image node_id 9 for calling the SampleSobolSequenceTest obj's underlying member method code with example usage: obj.test_skip_should_be_non_negative() without return types