X-Git-Url: https://scm.cri.ensmp.fr/git/linpy.git/blobdiff_plain/844f76f670a227d335e9bc539e1a61be7161452a..5a4b72c59f689a3eb67303c60a5d76a99d4b097c:/tests/test_linear.py diff --git a/tests/test_linear.py b/tests/test_linear.py index 4636275..879cc17 100644 --- a/tests/test_linear.py +++ b/tests/test_linear.py @@ -1,4 +1,4 @@ - +import functools import unittest from fractions import Fraction @@ -6,165 +6,223 @@ from fractions import Fraction from pypol.linear import * +try: + import sympy + def _with_sympy(func): + @functools.wraps(func) + def wrapper(self): + return func(self) + return wrapper +except ImportError: + def _with_sympy(func): + @functools.wraps(func) + def wrapper(self): + raise unittest.SkipTest('SymPy is not available') + return wrapper + + class TestExpression(unittest.TestCase): def setUp(self): - self.x = symbol('x') - self.y = symbol('y') - self.z = symbol('z') - self.zero = constant(0) - self.pi = constant(Fraction(22, 7)) - self.e = self.x - 2*self.y + 3 - - def test_new(self): - pass + self.x = Expression({'x': 1}) + self.y = Expression({'y': 1}) + self.z = Expression({'z': 1}) + self.zero = Expression(constant=0) + self.one = Expression(constant=1) + self.pi = Expression(constant=Fraction(22, 7)) + self.expr = self.x - 2*self.y + 3 + + def test_new_subclass(self): + self.assertIsInstance(self.x, Symbol) + self.assertIsInstance(self.pi, Constant) + self.assertNotIsInstance(self.x + self.pi, Symbol) + self.assertNotIsInstance(self.x + self.pi, Constant) + xx = Expression({'x': 2}) + self.assertNotIsInstance(xx, Symbol) + + def test_new_types(self): + with self.assertRaises(TypeError): + Expression('x + y', 2) + self.assertEqual(Expression({'x': 2}), Expression({self.x: 2})) + with self.assertRaises(TypeError): + Expression({0: 2}) + with self.assertRaises(TypeError): + Expression({'x': '2'}) + self.assertEqual(Expression(constant=1), Expression(constant=self.one)) + with self.assertRaises(TypeError): + Expression(constant='1') def test_symbols(self): - self.assertCountEqual(self.x.symbols(), ['x']) - self.assertCountEqual(self.pi.symbols(), []) - self.assertCountEqual(self.e.symbols(), ['x', 'y']) + self.assertCountEqual(self.x.symbols, ['x']) + self.assertCountEqual(self.pi.symbols, []) + self.assertCountEqual(self.expr.symbols, ['x', 'y']) def test_dimension(self): self.assertEqual(self.x.dimension, 1) self.assertEqual(self.pi.dimension, 0) - self.assertEqual(self.e.dimension, 2) + self.assertEqual(self.expr.dimension, 2) def test_coefficient(self): - self.assertEqual(self.e.coefficient('x'), 1) - self.assertEqual(self.e.coefficient('y'), -2) - self.assertEqual(self.e.coefficient(self.y), -2) - self.assertEqual(self.e.coefficient('z'), 0) + self.assertEqual(self.expr.coefficient('x'), 1) + self.assertEqual(self.expr.coefficient('y'), -2) + self.assertEqual(self.expr.coefficient(self.y), -2) + self.assertEqual(self.expr.coefficient('z'), 0) with self.assertRaises(TypeError): - self.e.coefficient(0) + self.expr.coefficient(0) with self.assertRaises(TypeError): - self.e.coefficient(self.e) + self.expr.coefficient(self.expr) def test_getitem(self): - self.assertEqual(self.e['x'], 1) - self.assertEqual(self.e['y'], -2) - self.assertEqual(self.e[self.y], -2) - self.assertEqual(self.e['z'], 0) + self.assertEqual(self.expr['x'], 1) + self.assertEqual(self.expr['y'], -2) + self.assertEqual(self.expr[self.y], -2) + self.assertEqual(self.expr['z'], 0) with self.assertRaises(TypeError): - self.e[0] + self.expr[0] with self.assertRaises(TypeError): - self.e[self.e] + self.expr[self.expr] def test_coefficients(self): - self.assertCountEqual(self.e.coefficients(), [('x', 1), ('y', -2)]) + self.assertCountEqual(self.expr.coefficients(), [('x', 1), ('y', -2)]) def test_constant(self): self.assertEqual(self.x.constant, 0) self.assertEqual(self.pi.constant, Fraction(22, 7)) - self.assertEqual(self.e.constant, 3) + self.assertEqual(self.expr.constant, 3) def test_isconstant(self): self.assertFalse(self.x.isconstant()) self.assertTrue(self.pi.isconstant()) - self.assertFalse(self.e.isconstant()) + self.assertFalse(self.expr.isconstant()) def test_values(self): - self.assertCountEqual(self.e.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.e.symbol() + self.assertCountEqual(self.expr.values(), [1, -2, 3]) def test_issymbol(self): self.assertTrue(self.x.issymbol()) self.assertFalse(self.pi.issymbol()) - self.assertFalse(self.e.issymbol()) + self.assertFalse(self.expr.issymbol()) def test_bool(self): self.assertTrue(self.x) self.assertFalse(self.zero) self.assertTrue(self.pi) - self.assertTrue(self.e) + self.assertTrue(self.expr) def test_pos(self): - self.assertEqual(+self.e, self.e) + self.assertEqual(+self.expr, self.expr) def test_neg(self): - self.assertEqual(-self.e, -self.x + 2*self.y - 3) + self.assertEqual(-self.expr, -self.x + 2*self.y - 3) def test_add(self): self.assertEqual(self.x + Fraction(22, 7), self.x + self.pi) self.assertEqual(Fraction(22, 7) + self.x, self.x + self.pi) self.assertEqual(self.x + self.x, 2 * self.x) - self.assertEqual(self.e + 2*self.y, self.x + 3) + self.assertEqual(self.expr + 2*self.y, self.x + 3) def test_sub(self): self.assertEqual(self.x - self.x, 0) - self.assertEqual(self.e - 3, self.x - 2*self.y) + self.assertEqual(self.expr - 3, self.x - 2*self.y) + self.assertEqual(0 - self.x, -self.x) def test_mul(self): self.assertEqual(self.pi * 7, 22) - self.assertEqual(self.e * 0, 0) - self.assertEqual(self.e * 2, 2*self.x - 4*self.y + 6) + self.assertEqual(self.expr * 0, 0) + self.assertEqual(0 * self.expr, 0) + self.assertEqual(self.expr * 2, 2*self.x - 4*self.y + 6) def test_div(self): with self.assertRaises(ZeroDivisionError): - self.e / 0 - self.assertEqual(self.e / 2, self.x / 2 - self.y + Fraction(3, 2)) + self.expr / 0 + self.assertEqual(self.expr / 2, self.x / 2 - self.y + Fraction(3, 2)) def test_str(self): self.assertEqual(str(Expression()), '0') self.assertEqual(str(self.x), 'x') self.assertEqual(str(-self.x), '-x') self.assertEqual(str(self.pi), '22/7') - self.assertEqual(str(self.e), 'x - 2*y + 3') + self.assertEqual(str(self.expr), 'x - 2*y + 3') def test_repr(self): - self.assertEqual(repr(self.e), "Expression({'x': 1, 'y': -2}, 3)") + self.assertEqual(repr(self.x), "Symbol('x')") + self.assertEqual(repr(self.one), 'Constant(1)') + self.assertEqual(repr(self.pi), 'Constant(22, 7)') + self.assertEqual(repr(self.expr), "Expression({'x': 1, 'y': -2}, 3)") - @unittest.expectedFailure def test_fromstring(self): self.assertEqual(Expression.fromstring('x'), self.x) self.assertEqual(Expression.fromstring('-x'), -self.x) self.assertEqual(Expression.fromstring('22/7'), self.pi) - self.assertEqual(Expression.fromstring('x - 2y + 3'), self.e) - self.assertEqual(Expression.fromstring('x - (3-1)y + 3'), self.e) - self.assertEqual(Expression.fromstring('x - 2*y + 3'), self.e) + self.assertEqual(Expression.fromstring('x - 2y + 3'), self.expr) + self.assertEqual(Expression.fromstring('x - (3-1)y + 3'), self.expr) + self.assertEqual(Expression.fromstring('x - 2*y + 3'), self.expr) def test_eq(self): - self.assertEqual(self.e, self.e) + self.assertEqual(self.expr, self.expr) self.assertNotEqual(self.x, self.y) self.assertEqual(self.zero, 0) - def test_canonify(self): - self.assertEqual((self.x + self.y/2 + self.z/3)._canonify(), + def test__toint(self): + self.assertEqual((self.x + self.y/2 + self.z/3)._toint(), 6*self.x + 3*self.y + 2*self.z) + @_with_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) + + @_with_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 TestHelpers(unittest.TestCase): + +class TestConstant(unittest.TestCase): def setUp(self): - self.x = symbol('x') - self.y = symbol('y') + self.zero = Constant(0) + self.one = Constant(1) + self.pi = Constant(Fraction(22, 7)) - def test_constant(self): - self.assertEqual(constant(3), 3) - self.assertEqual(constant('3'), 3) - self.assertEqual(constant(Fraction(3, 4)), Fraction(3, 4)) - self.assertEqual(constant('3/4'), Fraction(3, 4)) - with self.assertRaises(ValueError): - constant('a') + @_with_sympy + def test_fromsympy(self): + self.assertEqual(Constant.fromsympy(sympy.Rational(22, 7)), self.pi) with self.assertRaises(TypeError): - constant([]) + Constant.fromsympy(sympy.Symbol('x')) - def test_symbol(self): - self.assertEqual(symbol('x'), self.x) - self.assertNotEqual(symbol('y'), self.x) - with self.assertRaises(TypeError): - symbol(0) + +class TestSymbol(unittest.TestCase): + + def setUp(self): + 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]) + @_with_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): @@ -174,4 +232,3 @@ class TestOperators(unittest.TestCase): class TestPolyhedron(unittest.TestCase): pass -