X-Git-Url: https://svn.cri.ensmp.fr/git/linpy.git/blobdiff_plain/34bcb159c06a4725f7a2baaf5ddcc6dffd5d74fe..2b1e012ff2ad875e44e368bc37430ac5e5e97324:/tests/test_linear.py?ds=sidebyside

diff --git a/tests/test_linear.py b/tests/test_linear.py
index f02c4f4..ce42473 100644
--- a/tests/test_linear.py
+++ b/tests/test_linear.py
@@ -148,7 +148,8 @@ class TestExpression(unittest.TestCase):
         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)")
+        self.assertEqual(repr(self.x + self.one), "Expression('x + 1')")
+        self.assertEqual(repr(self.expr), "Expression('x - 2*y + 3')")
 
     def test_fromstring(self):
         self.assertEqual(Expression.fromstring('x'), self.x)
@@ -241,9 +242,13 @@ class TestPolyhedron(unittest.TestCase):
     def test_dimension(self):
         self.assertEqual(self.square.dimension, 2)
 
-    def test_tostring(self):
+    def test_str(self):
         self.assertEqual(str(self.square),
-            '{x >= 0, -x + 1 >= 0, y >= 0, -y + 1 >= 0}')
+            '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, '
@@ -267,3 +272,27 @@ class TestPolyhedron(unittest.TestCase):
         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())