code: def test_text_feature_returns_text_as_visualization_type(
      self,
  ) -> None:
      feature = TextFeature(self.FEATURE_NAME, None, None, None)
      self.assertEqual(feature.visualization_type(), "text")
  
file_path: captum/tests/insights/test_features.py
imports: from unittest.mock import patch
  import torch
  from captum.insights.attr_vis.features import _convert_figure_base64, EmptyFeature, FeatureOutput, GeneralFeature, ImageFeature, TextFeature
  from matplotlib.figure import Figure
  from tests.helpers.basic import BaseTest
label_desc: Use image node_id 1 for calling the TestTextFeature obj's underlying member method code with example usage: obj.test_text_feature_returns_text_as_visualization_type() without return types