code: def test_constructor_unwraps_index(self, index_flat):
      a = index_flat
      # Passing dtype is necessary for Index([True, False], dtype=object)
      #  case.
      b = type(a)(a, dtype=a.dtype)
      tm.assert_equal(a._data, b._data)
  
imports: from copy import copy, deepcopy
  import re
  import numpy
  import pytest
  from pandas.compat import IS64
  from pandas.compat.numpy import np_version_gte1p25
  from pandas.core.dtypes.common import is_integer_dtype, is_numeric_dtype
  import pandas
  from pandas import CategoricalIndex, MultiIndex, PeriodIndex, RangeIndex
  import pandas._testing
label_desc: Use image node_id 4 for calling the TestCommon obj's underlying member method code with example usage: obj.test_constructor_unwraps_index(index_flat) without return types