Unitary tests for Polyhedron, very incomplete

[linpy.git] / tests / test_linear.py

diff --git a/tests/test_linear.py b/tests/test_linear.py
index b7006a7..f02c4f4 100644 (file)
--- 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 _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):
@@ -151,8 +167,8 @@ class TestExpression(unittest.TestCase):
         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):
-        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)
@@ -160,8 +176,8 @@ class TestExpression(unittest.TestCase):
         with self.assertRaises(ValueError):
             Expression.fromsympy(sp_x*sp_y)
 
+    @_with_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))
@@ -175,8 +191,8 @@ class TestConstant(unittest.TestCase):
         self.one = Constant(1)
         self.pi = Constant(Fraction(22, 7))
 
+    @_with_sympy
     def test_fromsympy(self):
-        import sympy
         self.assertEqual(Constant.fromsympy(sympy.Rational(22, 7)), self.pi)
         with self.assertRaises(TypeError):
             Constant.fromsympy(sympy.Symbol('x'))
@@ -196,8 +212,8 @@ class TestSymbol(unittest.TestCase):
         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):
-        import sympy
         sp_x = sympy.Symbol('x')
         self.assertEqual(Symbol.fromsympy(sp_x), self.x)
         with self.assertRaises(TypeError):
@@ -215,4 +231,39 @@ 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_tostring(self):
+        self.assertEqual(str(self.square),
+            '{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
+    @_with_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)
+
+    @_with_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))