code: def test_draw_strokes_single_input(self):
      sf = self.stroke_sf
      single_bitmap = _tc.drawing_classifier.util.draw_strokes(
          sf[self.feature][0]
      )
      assert (
          type(single_bitmap) == _tc.Image
          and single_bitmap.channels == 1
          and single_bitmap.width == 28
          and single_bitmap.height == 28
      )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import os
  import turicreate
  from turicreate.toolkits._main import ToolkitError
  import numpy
  import tempfile
  from array import array
  import sys
  from .None import util
  import unittest
label_desc: Use image node_id 28 for calling the DrawingClassifierTest obj's underlying member method code with example usage: obj.test_draw_strokes_single_input() without return types