code: def test_conf_int():
      lower_, upper_ = RESULTS.conf_int()
  
      assert (lower_ < upper_).all()
      assert (lower_ > upper_ - 10).all()
  
      lower_, upper_ = RESULTS.conf_int(cols=[1]).T
  
      assert lower_ < upper_
      assert lower_ > upper_ - 10
  
file_path: nilearn/nilearn/glm/tests/test_model.py
imports: import numpy
  import pytest
  from numpy.testing import assert_array_almost_equal
  from nilearn.glm import OLSModel
label_desc: Use image node_id 8 for calling a global function with example usage: test_conf_int() without return types