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test_voigt.py
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			# -- coding: utf-8 --
			# @file
			# @section LICENSE
			#
			# Copyright (©) 2016-2021 EPFL (École Polytechnique Fédérale de Lausanne),
			# Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
			#
			# This program is free software: you can redistribute it and/or modify
			# it under the terms of the GNU Affero General Public License as published
			# by the Free Software Foundation, either version 3 of the License, or
			# (at your option) any later version.
			#
			# This program is distributed in the hope that it will be useful,
			# but WITHOUT ANY WARRANTY; without even the implied warranty of
			# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
			# GNU Affero General Public License for more details.
			#
			# You should have received a copy of the GNU Affero General Public License
			# along with this program. If not, see <https://www.gnu.org/licenses/>.

			import tamaas as tm
			import numpy as np


			def test_voigt(tamaas_fixture):
			shape = [3, 3, 3]
			stress = np.ones(shape + [9], dtype=tm.dtype)
			# voigt = np.zeros(shape + [6])
			voigt = tm.compute.to_voigt(stress)
			sol = np.ones(shape + [6], dtype=tm.dtype)
			sol[:, :, :, 3:] = np.sqrt(2)
			print(voigt)
			print(sol)
			assert np.all(np.abs(sol - voigt) < 1e-15)