pypol/tests/test_polyhedra.py

   1 import functools
   2 import unittest
   3
   4 from ..linexprs import symbols
   5 from ..polyhedra import *
   6 from .libhelper import requires_sympy
   7
   8
   9 class TestPolyhedron(unittest.TestCase):
  10
  11     def setUp(self):
  12         x, y = symbols('x y')
  13         self.square = Polyhedron(inequalities=[x, 1 - x, y, 1 - y])
  14
  15     def test_symbols(self):
  16         self.assertTupleEqual(self.square.symbols, symbols('x y'))
  17
  18     def test_dimension(self):
  19         self.assertEqual(self.square.dimension, 2)
  20
  21     def test_str(self):
  22         self.assertEqual(str(self.square),
  23             'And(0 <= x, 0 <= -x + 1, 0 <= y, 0 <= -y + 1)')
  24
  25     def test_repr(self):
  26         self.assertEqual(repr(self.square),
  27             "And(0 <= x, 0 <= -x + 1, 0 <= y, 0 <= -y + 1)")
  28
  29     def test_fromstring(self):
  30         self.assertEqual(Polyhedron.fromstring('{x >= 0, -x + 1 >= 0, '
  31             'y >= 0, -y + 1 >= 0}'), self.square)
  32
  33     def test_isempty(self):
  34         self.assertFalse(self.square.isempty())
  35
  36     def test_isuniverse(self):
  37         self.assertFalse(self.square.isuniverse())
  38
  39     @requires_sympy
  40     def test_fromsympy(self):
  41         import sympy
  42         sp_x, sp_y = sympy.symbols('x y')
  43         self.assertEqual(Polyhedron.fromsympy((sp_x >= 0) & (sp_x <= 1) &
  44             (sp_y >= 0) & (sp_y <= 1)), self.square)
  45
  46     @requires_sympy
  47     def test_tosympy(self):
  48         import sympy
  49         sp_x, sp_y = sympy.symbols('x y')
  50         self.assertEqual(self.square.tosympy(),
  51             sympy.And(-sp_x + 1 >= 0, -sp_y + 1 >= 0, sp_x >= 0, sp_y >= 0))
  52
  53
  54 class TestEmpty:
  55
  56     def test_repr(self):
  57         self.assertEqual(repr(Empty), 'Empty')
  58
  59     def test_isempty(self):
  60         self.assertTrue(Empty.isempty())
  61
  62     def test_isuniverse(self):
  63         self.assertFalse(Empty.isuniverse())
  64
  65
  66 class TestUniverse:
  67
  68     def test_repr(self):
  69         self.assertEqual(repr(Universe), 'Universe')
  70
  71     def test_isempty(self):
  72         self.assertTrue(Universe.isempty())
  73
  74     def test_isuniverse(self):
  75         self.assertTrue(Universe.isuniverse())