code: def test_coerce_list(self):
      # coerce things
      arr = Index([1, 2, 3, 4])
      assert isinstance(arr, Index)
  
      # but not if explicit dtype passed
      arr = Index([1, 2, 3, 4], dtype=object)
      assert type(arr) is Index
  
imports: import numpy
  import pytest
  import pandas
  from pandas import Index, Series
  import pandas._testing
label_desc: Use image node_id 8 for calling the TestIntNumericIndex obj's underlying member method code with example usage: obj.test_coerce_list() without return types