X-Git-Url: https://svn.cri.ensmp.fr/git/linpy.git/blobdiff_plain/5c08207a9606e513944a4ba01e6674ee8e13508a..66e41ccd173874b3309e4c24be64c7b6b2ac6298:/tests/test_linear.py diff --git a/tests/test_linear.py b/tests/test_linear.py index 96b105c..6cd1ff4 100644 --- a/tests/test_linear.py +++ b/tests/test_linear.py @@ -1,3 +1,4 @@ +import functools import unittest from fractions import Fraction @@ -5,6 +6,21 @@ from fractions import Fraction from pypol.linear import * +try: + import sympy + def _requires_sympy(func): + @functools.wraps(func) + def wrapper(self): + return func(self) + return wrapper +except ImportError: + def _requires_sympy(func): + @functools.wraps(func) + def wrapper(self): + raise unittest.SkipTest('SymPy is not available') + return wrapper + + class TestExpression(unittest.TestCase): def setUp(self): @@ -82,13 +98,6 @@ class TestExpression(unittest.TestCase): def test_values(self): self.assertCountEqual(self.expr.values(), [1, -2, 3]) - def test_symbol(self): - self.assertEqual(self.x.symbol, 'x') - with self.assertRaises(ValueError): - self.pi.symbol - with self.assertRaises(ValueError): - self.expr.symbol - def test_issymbol(self): self.assertTrue(self.x.issymbol()) self.assertFalse(self.pi.issymbol()) @@ -138,9 +147,10 @@ class TestExpression(unittest.TestCase): def test_repr(self): self.assertEqual(repr(self.x), "Symbol('x')") self.assertEqual(repr(self.one), 'Constant(1)') - self.assertEqual(repr(self.expr), "Expression({'x': 1, 'y': -2}, 3)") + self.assertEqual(repr(self.pi), 'Constant(22, 7)') + self.assertEqual(repr(self.x + self.one), "Expression('x + 1')") + self.assertEqual(repr(self.expr), "Expression('x - 2*y + 3')") - @unittest.expectedFailure def test_fromstring(self): self.assertEqual(Expression.fromstring('x'), self.x) self.assertEqual(Expression.fromstring('-x'), -self.x) @@ -158,10 +168,35 @@ class TestExpression(unittest.TestCase): self.assertEqual((self.x + self.y/2 + self.z/3)._toint(), 6*self.x + 3*self.y + 2*self.z) + @_requires_sympy + def test_fromsympy(self): + sp_x, sp_y = sympy.symbols('x y') + self.assertEqual(Expression.fromsympy(sp_x), self.x) + self.assertEqual(Expression.fromsympy(sympy.Rational(22, 7)), self.pi) + self.assertEqual(Expression.fromsympy(sp_x - 2*sp_y + 3), self.expr) + with self.assertRaises(ValueError): + Expression.fromsympy(sp_x*sp_y) + + @_requires_sympy + def test_tosympy(self): + sp_x, sp_y = sympy.symbols('x y') + self.assertEqual(self.x.tosympy(), sp_x) + self.assertEqual(self.pi.tosympy(), sympy.Rational(22, 7)) + self.assertEqual(self.expr.tosympy(), sp_x - 2*sp_y + 3) + class TestConstant(unittest.TestCase): - pass + def setUp(self): + self.zero = Constant(0) + self.one = Constant(1) + self.pi = Constant(Fraction(22, 7)) + + @_requires_sympy + def test_fromsympy(self): + self.assertEqual(Constant.fromsympy(sympy.Rational(22, 7)), self.pi) + with self.assertRaises(TypeError): + Constant.fromsympy(sympy.Symbol('x')) class TestSymbol(unittest.TestCase): @@ -170,11 +205,25 @@ class TestSymbol(unittest.TestCase): self.x = Symbol('x') self.y = Symbol('y') + def test_name(self): + self.assertEqual(self.x.name, 'x') + def test_symbols(self): self.assertListEqual(list(symbols('x y')), [self.x, self.y]) self.assertListEqual(list(symbols('x,y')), [self.x, self.y]) self.assertListEqual(list(symbols(['x', 'y'])), [self.x, self.y]) + @_requires_sympy + def test_fromsympy(self): + sp_x = sympy.Symbol('x') + self.assertEqual(Symbol.fromsympy(sp_x), self.x) + with self.assertRaises(TypeError): + Symbol.fromsympy(sympy.Rational(22, 7)) + with self.assertRaises(TypeError): + Symbol.fromsympy(2 * sp_x) + with self.assertRaises(TypeError): + Symbol.fromsympy(sp_x*sp_x) + class TestOperators(unittest.TestCase): @@ -183,4 +232,67 @@ class TestOperators(unittest.TestCase): class TestPolyhedron(unittest.TestCase): - pass + def setUp(self): + x, y = symbols('x y') + self.square = Polyhedron(inequalities=[x, 1 - x, y, 1 - y]) + + def test_symbols(self): + self.assertCountEqual(self.square.symbols, ['x', 'y']) + + def test_dimension(self): + self.assertEqual(self.square.dimension, 2) + + def test_str(self): + self.assertEqual(str(self.square), + 'x >= 0, -x + 1 >= 0, y >= 0, -y + 1 >= 0') + + def test_repr(self): + self.assertEqual(repr(self.square), + "Polyhedron('x >= 0, -x + 1 >= 0, y >= 0, -y + 1 >= 0')") + + def test_fromstring(self): + self.assertEqual(Polyhedron.fromstring('{x >= 0, -x + 1 >= 0, ' + 'y >= 0, -y + 1 >= 0}'), self.square) + + def test_isempty(self): + self.assertFalse(self.square.isempty()) + + def test_isuniverse(self): + self.assertFalse(self.square.isuniverse()) + + @unittest.expectedFailure + @_requires_sympy + def test_fromsympy(self): + sp_x, sp_y = sympy.symbols('x y') + self.assertEqual(Polyhedron.fromsympy((sp_x >= 0) & (sp_x <= 1) & + (sp_y >= 0) & (sp_y <= 1)), self.square) + + @_requires_sympy + def test_tosympy(self): + sp_x, sp_y = sympy.symbols('x y') + self.assertEqual(self.square.tosympy(), + sympy.And(-sp_x + 1 >= 0, -sp_y + 1 >= 0, sp_x >= 0, sp_y >= 0)) + + +class TestEmpty: + + def test_repr(self): + self.assertEqual(repr(Empty), 'Empty') + + def test_isempty(self): + self.assertTrue(Empty.isempty()) + + def test_isuniverse(self): + self.assertFalse(Empty.isuniverse()) + + +class TestUniverse: + + def test_repr(self): + self.assertEqual(repr(Universe), 'Universe') + + def test_isempty(self): + self.assertTrue(Universe.isempty()) + + def test_isuniverse(self): + self.assertTrue(Universe.isuniverse())