code: def test_glover_hrf():
      """test that the spm_hrf is correctly normalized and has correct length"""
      h = glover_hrf(2.0)
      assert_almost_equal(h.sum(), 1)
      assert len(h) == 256
  
imports: import warnings
  import numpy
  import pytest
  from numpy.testing import assert_almost_equal, assert_array_equal
  from ..hemodynamic_models import _hrf_kernel, _orthogonalize, _regressor_names, _resample_regressor, _sample_condition, compute_regressor, glover_hrf, glover_time_derivative, spm_dispersion_derivative, spm_hrf, spm_time_derivative
label_desc: Use image node_id 3 for calling a global function with example usage: test_glover_hrf() without return types