class_docstr: Test the ParallelCoordinates visualizer
class_docstr_tok: ["Test","the","ParallelCoordinates","visualizer"]
docstr: Negative int values should raise exception
docstr_tok: ["Negative","int","values","should","raise","exception"]
code: def test_sample_int_invalid(self):
      """
      Negative int values should raise exception
      """
      with pytest.raises(YellowbrickValueError):
          ParallelCoordinates(sample=-1)
  
imports: import pytest
  import numpy
  from yellowbrick.datasets import load_occupancy
  from yellowbrick.features.pcoords import *
  from tests.base import VisualTestCase
  from ..fixtures import Dataset
  from sklearn.datasets import make_classification
label_desc: Use image node_id 20 for calling the TestParallelCoordinates obj's underlying member method code with example usage: obj.test_sample_int_invalid() without return types