text: # -*- coding: utf-8 -*-
  """
  Defines the unit tests for the :mod:`colour.difference.cam02_ucs` module.
  """
  
  import numpy as np
  import unittest
  from itertools import permutations
  
  from colour.difference import (delta_E_CAM02LCD, delta_E_CAM02SCD,
                                 delta_E_CAM02UCS)
  from colour.difference.cam02_ucs import delta_E_Luo2006
  from colour.models.cam02_ucs import COEFFICIENTS_UCS_LUO2006
  from colour.utilities import ignore_numpy_errors
  
  __author__ = 'Colour Developers'
  __copyright__ = 'Copyright (C) 2013-2021 - Colour Developers'
  __license__ = 'New BSD License - https://opensource.org/licenses/BSD-3-Clause'
  __maintainer__ = 'Colour Developers'
  __email__ = 'colour-developers@colour-science.org'
  __status__ = 'Production'
  
  __all__ = ['TestDelta_E_Luo2006']
  
  
  class TestDelta_E_Luo2006(unittest.TestCase):
      """
      Defines :func:`colour.difference.cam02_ucs.delta_E_Luo2006` definition unit
      tests methods.
      """
  
      def test_delta_E_Luo2006(self):
          """
          Tests :func:`colour.difference.cam02_ucs.delta_E_Luo2006` definition.
          """
  
          self.assertAlmostEqual(
              delta_E_Luo2006(
                  np.array([54.90433134, -0.08450395, -0.06854831]),
                  np.array([54.80352754, -3.96940084, -13.57591013]),
                  COEFFICIENTS_UCS_LUO2006['CAM02-LCD']),
              14.055546437777583,
              places=7)
  
          self.assertAlmostEqual(
              delta_E_Luo2006(
                  np.array([54.90433134, -0.08450395, -0.06854831]),
                  np.array([54.80352754, -3.96940084, -13.57591013]),
                  COEFFICIENTS_UCS_LUO2006['CAM02-LCD']),
              delta_E_CAM02LCD(
                  np.array([54.90433134, -0.08450395, -0.06854831]),
                  np.array([54.80352754, -3.96940084, -13.57591013])),
              places=7)
  
          self.assertAlmostEqual(
              delta_E_Luo2006(
                  np.array([54.90433134, -0.08450395, -0.06854831]),
                  np.array([54.80352754, -3.96940084, -13.57591013]),
                  COEFFICIENTS_UCS_LUO2006['CAM02-SCD']),
              delta_E_CAM02SCD(
                  np.array([54.90433134, -0.08450395, -0.06854831]),
                  np.array([54.80352754, -3.96940084, -13.57591013])),
              places=7)
  
          self.assertAlmostEqual(
              delta_E_Luo2006(
                  np.array([54.90433134, -0.08450395, -0.06854831]),
                  np.array([54.80352754, -3.96940084, -13.57591013]),
                  COEFFICIENTS_UCS_LUO2006['CAM02-UCS']),
              delta_E_CAM02UCS(
                  np.array([54.90433134, -0.08450395, -0.06854831]),
                  np.array([54.80352754, -3.96940084, -13.57591013])),
              places=7)
  
      def test_n_dimensional_delta_E_Luo2006(self):
          """
          Tests :func:`colour.difference.cam02_ucs.delta_E_Luo2006` definition
          n-dimensional arrays support.
          """
  
          Jpapbp_1 = np.array([54.90433134, -0.08450395, -0.06854831])
          Jpapbp_2 = np.array([54.80352754, -3.96940084, -13.57591013])
          delta_E_p = delta_E_Luo2006(Jpapbp_1, Jpapbp_2,
                                      COEFFICIENTS_UCS_LUO2006['CAM02-LCD'])
  
          Jpapbp_1 = np.tile(Jpapbp_1, (6, 1))
          Jpapbp_2 = np.tile(Jpapbp_2, (6, 1))
          delta_E_p = np.tile(delta_E_p, 6)
          np.testing.assert_almost_equal(
              delta_E_Luo2006(Jpapbp_1, Jpapbp_2,
                              COEFFICIENTS_UCS_LUO2006['CAM02-LCD']),
              delta_E_p,
              decimal=7)
  
          Jpapbp_1 = np.reshape(Jpapbp_1, (2, 3, 3))
          Jpapbp_2 = np.reshape(Jpapbp_2, (2, 3, 3))
          delta_E_p = np.reshape(delta_E_p, (2, 3))
          np.testing.assert_almost_equal(
              delta_E_Luo2006(Jpapbp_1, Jpapbp_2,
                              COEFFICIENTS_UCS_LUO2006['CAM02-LCD']),
              delta_E_p,
              decimal=7)
  
      @ignore_numpy_errors
      def test_nan_delta_E_Luo2006(self):
          """
          Tests :func:`colour.difference.cam02_ucs.delta_E_Luo2006`
          definition nan support.
          """
  
          cases = [-1.0, 0.0, 1.0, -np.inf, np.inf, np.nan]
          cases = set(permutations(cases * 3, r=3))
          for case in cases:
              Jpapbp_1 = np.array(case)
              Jpapbp_2 = np.array(case)
              delta_E_Luo2006(Jpapbp_1, Jpapbp_2,
                              COEFFICIENTS_UCS_LUO2006['CAM02-LCD']),
  
  
  if __name__ == '__main__':
      unittest.main()
  