code: def test_opts_image_line_magic(self):
      nbname = "test_opts_image_line_magic.ipynb"
      expected = (
          """hv.util.opts(" Image [xaxis=None] (cmap='viridis')")"""
      )
      source = apply_preprocessors([OptsMagicProcessor()], nbname)
      self.assertEqual(source.strip().endswith(expected), True)
  
file_path: holoviews/holoviews/tests/ipython/test_notebooks.py
imports: import os
  import nbconvert
  import nbformat
  from holoviews.element.comparison import ComparisonTestCase
  from holoviews.ipython.preprocessors import OptsMagicProcessor, OutputMagicProcessor
label_desc: Use image node_id 1 for calling the TestOptsPreprocessor obj's underlying member method code with example usage: obj.test_opts_image_line_magic() without return types