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# Copyright 2023 DeepMind Technologies Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Unit tests for geometry.py."""
import unittest
from absl.testing import absltest
import geometry as gm
class GeometryTest(unittest.TestCase):
def _setup_equality_example(self):
# Create 4 nodes a, b, c, d
# and their lengths
a = gm.Segment('a')
la = gm.Length('l(a)')
a.connect_to(la)
la.connect_to(a)
b = gm.Segment('b')
lb = gm.Length('l(b)')
b.connect_to(lb)
lb.connect_to(b)
c = gm.Segment('c')
lc = gm.Length('l(c)')
c.connect_to(lc)
lc.connect_to(c)
d = gm.Segment('d')
ld = gm.Length('l(d)')
d.connect_to(ld)
ld.connect_to(d)
# Now let a=b, b=c, a=c, c=d
la.merge([lb], 'fact1')
lb.merge([lc], 'fact2')
la.merge([lc], 'fact3')
lc.merge([ld], 'fact4')
return a, b, c, d, la, lb, lc, ld
def test_merged_node_representative(self):
_, _, _, _, la, lb, lc, ld = self._setup_equality_example()
# all nodes are now represented by la.
self.assertEqual(la.rep(), la)
self.assertEqual(lb.rep(), la)
self.assertEqual(lc.rep(), la)
self.assertEqual(ld.rep(), la)
def test_merged_node_equivalence(self):
_, _, _, _, la, lb, lc, ld = self._setup_equality_example()
# all la, lb, lc, ld are equivalent
self.assertCountEqual(la.equivs(), [la, lb, lc, ld])
self.assertCountEqual(lb.equivs(), [la, lb, lc, ld])
self.assertCountEqual(lc.equivs(), [la, lb, lc, ld])
self.assertCountEqual(ld.equivs(), [la, lb, lc, ld])
def test_bfs_for_equality_transitivity(self):
a, _, _, d, _, _, _, _ = self._setup_equality_example()
# check that a==d because fact3 & fact4, not fact1 & fact2
self.assertCountEqual(gm.why_equal(a, d), ['fact3', 'fact4'])
if __name__ == '__main__':
absltest.main()
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