code: def test_append(self, indices, expected):
      # GH16212
      result = indices[0].append(indices[1:])
      tm.assert_index_equal(result, expected, exact=True)
  
      if len(indices) == 2:
          # Append single item rather than list
          result2 = indices[0].append(indices[1])
          tm.assert_index_equal(result2, expected, exact=True)
  
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 36 for calling the TestRangeIndex obj's underlying member method code with example usage: obj.test_append(indices, expected) without return types