code: def test_convert_idx(self):
      spans = mrc_sample.convert_idx(
          context, mrc_sample.get_words("context")
      )
      self.assertEqual(spans[1][0], 6)
  
file_path: textflint/test/input/component/sample/test_mrc_sample.py
imports: import unittest
  from textflint.input.component.sample.mrc_sample import MRCSample
label_desc: Use image node_id 2 for calling the TestMRCSample obj's underlying member method code with example usage: obj.test_convert_idx() without return types