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"""Unit tests for the Face class"""
# Copyright (C) 2011 Garth N. Wells
#
# This file is part of DOLFIN.
#
# DOLFIN is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# DOLFIN 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
#
# First added: 2011-02-26
# Last changed: 2014-05-30
import pytest
from dolfin import *
from dolfin_utils.test import skip_in_parallel, fixture
@fixture
def cube():
return UnitCubeMesh(5, 5, 5)
@fixture
def square():
return UnitSquareMesh(5, 5)
@skip_in_parallel
def test_Area(cube, square):
"""Iterate over faces and sum area."""
area = 0.0
for f in faces(cube):
area += f.area()
assert round(area - 39.21320343559672494393, 7) == 0
area = 0.0
for f in faces(square):
area += f.area()
assert round(area - 1.0, 7) == 0
@skip_in_parallel
def test_NormalPoint(cube, square):
"""Compute normal vector to each face."""
for f in faces(cube):
n = f.normal()
assert round(n.norm() - 1.0, 7) == 0
f = Face(square, 0)
with pytest.raises(RuntimeError):
f.normal()
@skip_in_parallel
def test_NormalComponent(cube, square):
"""Compute normal vector components to each face."""
D = cube.topology().dim()
for f in faces(cube):
n = [f.normal(i) for i in range(D)]
norm = sum([x*x for x in n])
assert round(norm - 1.0, 7) == 0
f = Face(square, 0)
with pytest.raises(RuntimeError):
f.normal(0)
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