class_docstr: Test DecisionBoundariesVisualizer
class_docstr_tok: ["Test","DecisionBoundariesVisualizer"]
docstr: Test fit when features are specified
docstr_tok: ["Test","fit","when","features","are","specified"]
code: def test_fit_features_assignment(self):
      """
      Test fit when features are specified
      """
      model = neighbors.KNeighborsClassifier(3)
      viz = DecisionBoundariesVisualizer(model, features=["one", "two"])
      fitted_viz = viz.fit(X_two_cols, y=y)
      assert fitted_viz.features_ == ["one", "two"]
  
imports: import sys
  import pytest
  import numpy
  from unittest import mock
  from tests.base import VisualTestCase
  from yellowbrick.contrib.classifier import *
  from yellowbrick.exceptions import YellowbrickTypeError
  from yellowbrick.exceptions import YellowbrickValueError
  from sklearn import datasets
  from sklearn import neighbors
  from sklearn import naive_bayes
label_desc: Use image node_id 9 for calling the TestDecisionBoundariesVisualizer obj's underlying member method code with example usage: obj.test_fit_features_assignment() without return types