Improve error messages in linexprs.py

[linpy.git] / pypol / tests / test_polyhedra.py

diff --git a/pypol/tests/test_polyhedra.py b/pypol/tests/test_polyhedra.py
index c74e25f..689602b 100644 (file)
--- a/pypol/tests/test_polyhedra.py
+++ b/pypol/tests/test_polyhedra.py
@@ -3,21 +3,7 @@ import unittest
 
 from ..linexprs import symbols
 from ..polyhedra 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 TestPolyhedron(unittest.TestCase):
@@ -27,18 +13,18 @@ class TestPolyhedron(unittest.TestCase):
         self.square = Polyhedron(inequalities=[x, 1 - x, y, 1 - y])
 
     def test_symbols(self):
-        self.assertCountEqual(self.square.symbols, ['x', 'y'])
+        self.assertTupleEqual(self.square.symbols, symbols('x y'))
 
     def test_dimension(self):
         self.assertEqual(self.square.dimension, 2)
 
     def test_str(self):
         self.assertEqual(str(self.square),
-            'And(Ge(x, 0), Ge(-x + 1, 0), Ge(y, 0), Ge(-y + 1, 0))')
+            'And(0 <= x, 0 <= -x + 1, 0 <= y, 0 <= -y + 1)')
 
     def test_repr(self):
         self.assertEqual(repr(self.square),
-            "And(Ge(x, 0), Ge(-x + 1, 0), Ge(y, 0), Ge(-y + 1, 0))")
+            "And(0 <= x, 0 <= -x + 1, 0 <= y, 0 <= -y + 1)")
 
     def test_fromstring(self):
         self.assertEqual(Polyhedron.fromstring('{x >= 0, -x + 1 >= 0, '
@@ -50,14 +36,16 @@ class TestPolyhedron(unittest.TestCase):
     def test_isuniverse(self):
         self.assertFalse(self.square.isuniverse())
 
-    @_requires_sympy
+    @requires_sympy
     def test_fromsympy(self):
+        import sympy
         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
+    @requires_sympy
     def test_tosympy(self):
+        import sympy
         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))