X-Git-Url: https://svn.cri.ensmp.fr/git/linpy.git/blobdiff_plain/1d494bb187b70135df721c13306d7f26fdf33f50..9f4798446bbb3ac43f7b8291ddae095af3818299:/pypol/tests/test_linexprs.py diff --git a/pypol/tests/test_linexprs.py b/pypol/tests/test_linexprs.py index 1606ea0..adfec7d 100644 --- a/pypol/tests/test_linexprs.py +++ b/pypol/tests/test_linexprs.py @@ -4,29 +4,15 @@ import unittest from fractions import Fraction from ..linexprs 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 +from .libhelper import requires_sympy class TestExpression(unittest.TestCase): def setUp(self): - self.x = Expression({'x': 1}) - self.y = Expression({'y': 1}) - self.z = Expression({'z': 1}) + self.x = Symbol('x') + self.y = Symbol('y') + self.z = Symbol('z') self.zero = Expression(constant=0) self.one = Expression(constant=1) self.pi = Expression(constant=Fraction(22, 7)) @@ -34,14 +20,13 @@ class TestExpression(unittest.TestCase): def test_new(self): self.assertIsInstance(self.x, Symbol) - self.assertIsInstance(self.pi, Constant) + self.assertIsInstance(self.pi, Rational) self.assertNotIsInstance(self.x + self.pi, Symbol) - self.assertNotIsInstance(self.x + self.pi, Constant) - xx = Expression({'x': 2}) + self.assertNotIsInstance(self.x + self.pi, Rational) + xx = Expression({self.x: 2}) self.assertNotIsInstance(xx, Symbol) 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): @@ -52,27 +37,29 @@ class TestExpression(unittest.TestCase): Expression(constant='a') def test_coefficient(self): - self.assertEqual(self.expr.coefficient('x'), 1) - self.assertEqual(self.expr.coefficient('y'), -2) + self.assertEqual(self.expr.coefficient(self.x), 1) self.assertEqual(self.expr.coefficient(self.y), -2) - self.assertEqual(self.expr.coefficient('z'), 0) + self.assertEqual(self.expr.coefficient(self.z), 0) + with self.assertRaises(TypeError): + self.expr.coefficients('x') with self.assertRaises(TypeError): self.expr.coefficient(0) with self.assertRaises(TypeError): self.expr.coefficient(self.expr) def test_getitem(self): - self.assertEqual(self.expr['x'], 1) - self.assertEqual(self.expr['y'], -2) + self.assertEqual(self.expr[self.x], 1) self.assertEqual(self.expr[self.y], -2) - self.assertEqual(self.expr['z'], 0) + self.assertEqual(self.expr[self.z], 0) + with self.assertRaises(TypeError): + self.assertEqual(self.expr['x'], 1) with self.assertRaises(TypeError): self.expr[0] with self.assertRaises(TypeError): self.expr[self.expr] def test_coefficients(self): - self.assertCountEqual(self.expr.coefficients(), [('x', 1), ('y', -2)]) + self.assertCountEqual(self.expr.coefficients(), [(self.x, 1), (self.y, -2)]) def test_constant(self): self.assertEqual(self.x.constant, 0) @@ -80,9 +67,9 @@ class TestExpression(unittest.TestCase): self.assertEqual(self.expr.constant, 3) def test_symbols(self): - self.assertCountEqual(self.x.symbols, ['x']) + self.assertCountEqual(self.x.symbols, [self.x]) self.assertCountEqual(self.pi.symbols, []) - self.assertCountEqual(self.expr.symbols, ['x', 'y']) + self.assertCountEqual(self.expr.symbols, [self.x, self.y]) def test_dimension(self): self.assertEqual(self.x.dimension, 1) @@ -141,10 +128,30 @@ class TestExpression(unittest.TestCase): self.assertNotEqual(self.x, self.y) self.assertEqual(self.zero, 0) - def test__toint(self): - self.assertEqual((self.x + self.y/2 + self.z/3)._toint(), + def test_scaleint(self): + self.assertEqual((self.x + self.y/2 + self.z/3).scaleint(), 6*self.x + 3*self.y + 2*self.z) + def test_subs(self): + self.assertEqual(self.x.subs(self.x, 3), 3) + self.assertEqual(self.x.subs(self.x, self.x), self.x) + self.assertEqual(self.x.subs(self.x, self.y), self.y) + self.assertEqual(self.x.subs(self.x, self.x + self.y), self.x + self.y) + self.assertEqual(self.x.subs(self.y, 3), self.x) + self.assertEqual(self.pi.subs(self.x, 3), self.pi) + self.assertEqual(self.expr.subs(self.x, -3), -2 * self.y) + self.assertEqual(self.expr.subs([(self.x, self.y), (self.y, self.x)]), 3 - self.x) + self.assertEqual(self.expr.subs({self.x: self.z, self.y: self.z}), 3 - self.z) + self.assertEqual(self.expr.subs({self.x: self.z, self.y: self.z}), 3 - self.z) + with self.assertRaises(TypeError): + self.x.subs('x', 3) + with self.assertRaises(TypeError): + self.expr.subs([('x', self.z), ('y', self.z)]) + with self.assertRaises(TypeError): + self.expr.subs({'x': self.z, 'y': self.z}) + with self.assertRaises(TypeError): + self.expr.subs(self.x, 'x') + def test_fromstring(self): self.assertEqual(Expression.fromstring('x'), self.x) self.assertEqual(Expression.fromstring('-x'), -self.x) @@ -153,22 +160,16 @@ class TestExpression(unittest.TestCase): self.assertEqual(Expression.fromstring('x - (3-1)y + 3'), self.expr) self.assertEqual(Expression.fromstring('x - 2*y + 3'), self.expr) - def test_str(self): + def test_repr(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.expr), 'x - 2*y + 3') - def test_repr(self): - 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.x + self.one), "Expression('x + 1')") - self.assertEqual(repr(self.expr), "Expression('x - 2*y + 3')") - - @_requires_sympy + @requires_sympy def test_fromsympy(self): + import sympy 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) @@ -176,8 +177,9 @@ class TestExpression(unittest.TestCase): with self.assertRaises(ValueError): Expression.fromsympy(sp_x*sp_y) - @_requires_sympy + @requires_sympy def test_tosympy(self): + import sympy sp_x, sp_y = sympy.symbols('x y') self.assertEqual(self.x.tosympy(), sp_x) self.assertEqual(self.pi.tosympy(), sympy.Rational(22, 7)) @@ -192,7 +194,8 @@ class TestSymbol(unittest.TestCase): def test_new(self): self.assertEqual(Symbol(' x '), self.x) - self.assertEqual(Symbol(self.x), self.x) + with self.assertRaises(TypeError): + Symbol(self.x) with self.assertRaises(TypeError): Symbol(1) @@ -207,14 +210,12 @@ class TestSymbol(unittest.TestCase): with self.assertRaises(SyntaxError): Symbol.fromstring('1') - def test_str(self): - self.assertEqual(str(self.x), 'x') - def test_repr(self): - self.assertEqual(repr(self.x), "Symbol('x')") + self.assertEqual(str(self.x), 'x') - @_requires_sympy + @requires_sympy def test_fromsympy(self): + import sympy sp_x = sympy.Symbol('x') self.assertEqual(Symbol.fromsympy(sp_x), self.x) with self.assertRaises(TypeError): @@ -230,18 +231,18 @@ class TestSymbol(unittest.TestCase): self.assertListEqual(list(symbols(['x', 'y'])), [self.x, self.y]) -class TestConstant(unittest.TestCase): +class TestRational(unittest.TestCase): def setUp(self): - self.zero = Constant(0) - self.one = Constant(1) - self.pi = Constant(Fraction(22, 7)) + self.zero = Rational(0) + self.one = Rational(1) + self.pi = Rational(Fraction(22, 7)) def test_new(self): - self.assertEqual(Constant(), self.zero) - self.assertEqual(Constant(1), self.one) - self.assertEqual(Constant(self.pi), self.pi) - self.assertEqual(Constant('22/7'), self.pi) + self.assertEqual(Rational(), self.zero) + self.assertEqual(Rational(1), self.one) + self.assertEqual(Rational(self.pi), self.pi) + self.assertEqual(Rational('22/7'), self.pi) def test_isconstant(self): self.assertTrue(self.zero.isconstant()) @@ -251,19 +252,20 @@ class TestConstant(unittest.TestCase): self.assertTrue(self.pi) def test_fromstring(self): - self.assertEqual(Constant.fromstring('22/7'), self.pi) + self.assertEqual(Rational.fromstring('22/7'), self.pi) with self.assertRaises(ValueError): - Constant.fromstring('a') + Rational.fromstring('a') with self.assertRaises(TypeError): - Constant.fromstring(1) + Rational.fromstring(1) def test_repr(self): - self.assertEqual(repr(self.zero), 'Constant(0)') - self.assertEqual(repr(self.one), 'Constant(1)') - self.assertEqual(repr(self.pi), 'Constant(22, 7)') + self.assertEqual(repr(self.zero), '0') + self.assertEqual(repr(self.one), '1') + self.assertEqual(repr(self.pi), '22/7') - @_requires_sympy + @requires_sympy def test_fromsympy(self): - self.assertEqual(Constant.fromsympy(sympy.Rational(22, 7)), self.pi) + import sympy + self.assertEqual(Rational.fromsympy(sympy.Rational(22, 7)), self.pi) with self.assertRaises(TypeError): - Constant.fromsympy(sympy.Symbol('x')) + Rational.fromsympy(sympy.Symbol('x'))