Methods Expression.fromsympy(), Expression.tosympy()

[linpy.git] / tests / test_linear.py

diff --git a/tests/test_linear.py b/tests/test_linear.py
index 2375092..b7006a7 100644 (file)
--- a/tests/test_linear.py
+++ b/tests/test_linear.py
@@ -151,10 +151,35 @@ class TestExpression(unittest.TestCase):
         self.assertEqual((self.x + self.y/2 + self.z/3)._toint(),
                 6*self.x + 3*self.y + 2*self.z)
 
+    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)
+        self.assertEqual(Expression.fromsympy(sp_x - 2*sp_y + 3), self.expr)
+        with self.assertRaises(ValueError):
+            Expression.fromsympy(sp_x*sp_y)
+
+    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))
+        self.assertEqual(self.expr.tosympy(), sp_x - 2*sp_y + 3)
+
 
 class TestConstant(unittest.TestCase):
 
-    pass
+    def setUp(self):
+        self.zero = Constant(0)
+        self.one = Constant(1)
+        self.pi = Constant(Fraction(22, 7))
+
+    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'))
 
 
 class TestSymbol(unittest.TestCase):
@@ -171,6 +196,17 @@ class TestSymbol(unittest.TestCase):
         self.assertListEqual(list(symbols('x,y')), [self.x, self.y])
         self.assertListEqual(list(symbols(['x', 'y'])), [self.x, self.y])
 
+    def test_fromsympy(self):
+        import sympy
+        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):