code: def test_single_color_cmc():
      lab1 = (0.5, 0.5, 0.5)
      lab2 = (0.4, 0.4, 0.4)
      deltaE_cmc(lab1, lab2)
  
file_path: scikit-image/skimage/color/tests/test_delta_e.py
imports: import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_almost_equal, assert_equal
  from skimage._shared.testing import fetch
  from skimage._shared.utils import _supported_float_type
  from skimage.color.delta_e import deltaE_cie76, deltaE_ciede94, deltaE_ciede2000, deltaE_cmc
label_desc: Use image node_id 10 for calling a global function with example usage: test_single_color_cmc() without return types