code: def test_insert(self):
      idx = RangeIndex(5, name="Foo")
      result = idx[1:4]
  
      # test 0th element
      tm.assert_index_equal(
          idx[0:4], result.insert(0, idx[0]), exact="equiv"
      )
  
      # GH 18295 (test missing)
      expected = Index([0, np.nan, 1, 2, 3, 4], dtype=np.float64)
      for na in [np.nan, None, pd.NA]:
          result = RangeIndex(5).insert(1, na)
          tm.assert_index_equal(result, expected)
  
      result = RangeIndex(5).insert(1, pd.NaT)
      expected = Index([0, pd.NaT, 1, 2, 3, 4], dtype=object)
      tm.assert_index_equal(result, expected)
  
imports: import numpy
  import pytest
  from pandas.core.dtypes.common import ensure_platform_int
  import pandas
  from pandas import Index, RangeIndex
  import pandas._testing
label_desc: Use image node_id 8 for calling the TestRangeIndex obj's underlying member method code with example usage: obj.test_insert() without return types