code: def test_delete_field_at_index(self):
      # test insert before index and mask
      del_sample = pos_sample.delete_field_at_index("x", [1, 3])
      self.assertEqual(
          ["That", "good", "survey"], del_sample.dump()["x"]
      )
      self.assertEqual(del_sample.dump()["y"], ["DT", "JJ", "NN"])
      self.assertEqual([0, 0, 0], del_sample.x.mask)
      self.assertRaises(
          ValueError, pos_sample.delete_field_at_index, "x", [5, 4]
      )
  
file_path: textflint/test/input/component/sample/test_pos_sample.py
imports: import unittest
  from textflint.input.component.sample.pos_sample import *
label_desc: Use image node_id 4 for calling the TestPOSSample obj's underlying member method code with example usage: obj.test_delete_field_at_index() without return types