code: def test_opts_image_line_magic_svg(self):
      nbname = "test_output_svg_line_magic.ipynb"
      expected = """hv.util.output(" fig='svg'")"""
      source = apply_preprocessors([OutputMagicProcessor()], 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 4 for calling the TestOptsPreprocessor obj's underlying member method code with example usage: obj.test_opts_image_line_magic_svg() without return types