code: def test_cm_preload():
      plt.imshow([list(range(10))], cmap="cold_hot")
  
file_path: nilearn/nilearn/plotting/tests/test_cm.py
imports: import matplotlib.pyplot
  import numpy
  import pytest
  from nilearn.plotting.cm import dim_cmap, mix_colormaps, replace_inside
label_desc: Use image node_id 3 for calling a global function with example usage: test_cm_preload() without return types