class_docstr: Test Manifold visualizer
class_docstr_tok: ["Test","Manifold","visualizer"]
docstr: Should not raise a warning if n_neighbors not specified
docstr_tok: ["Should","not","raise","a","warning","if","n_neighbors","not","specified"]
code: def test_manifold_no_warning(self, algorithm):
      """
      Should not raise a warning if n_neighbors not specified
      """
      message = "case failed for {}".format(algorithm)
  
      with pytest.warns(None) as record:
          assert not record.list, message
  
imports: import pytest
  from yellowbrick.features.manifold import *
  from yellowbrick.utils.types import is_estimator
  from yellowbrick.features.base import TargetType
  from yellowbrick.exceptions import YellowbrickValueError, ModelError, NotFitted
  from sklearn.pipeline import Pipeline
  from sklearn.decomposition import PCA
  from sklearn.datasets import make_blobs
  from sklearn.datasets import make_s_curve
  from sklearn.manifold import LocallyLinearEmbedding
  from unittest.mock import patch
  from tests.base import VisualTestCase
label_desc: Use image node_id 3 for calling the TestManifold obj's underlying member method code with example usage: obj.test_manifold_no_warning(algorithm) without return types