code: def test_insert(self):
      # GH 7256
      # validate neg/pos inserts
      result = Index(["b", "c", "d"])
  
      # test 0th element
      tm.assert_index_equal(
          Index(["a", "b", "c", "d"]), result.insert(0, "a")
      )
  
      # test Nth element that follows Python list behavior
      tm.assert_index_equal(
          Index(["b", "c", "e", "d"]), result.insert(-1, "e")
      )
  
      # test loc +/- neq (0, -1)
      tm.assert_index_equal(
          result.insert(1, "z"), result.insert(-2, "z")
      )
  
      # test empty
      null_index = Index([])
      tm.assert_index_equal(
          Index(["a"], dtype=object), null_index.insert(0, "a")
      )
  
file_path: pandas/pandas/tests/indexes/base_class/test_reshape.py
imports: import numpy
  import pytest
  from pandas import Index
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestReshape obj's underlying member method code with example usage: obj.test_insert() without return types