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[linpy.git] / tests / test_linear.py

diff --git a/tests/test_linear.py b/tests/test_linear.py
index 93fc838..998a022 100644 (file)
--- a/tests/test_linear.py
+++ b/tests/test_linear.py
@@ -34,7 +34,7 @@ class TestExpression(unittest.TestCase):
         self.assertEqual(self.e.coefficient('x'), 1)
         self.assertEqual(self.e.coefficient('y'), -2)
         self.assertEqual(self.e.coefficient(self.y), -2)
-        self.assertEqual(self.e.coefficient('z'), 0)
+        self.assertEqual(self.e.coefficient('z'), 3)
         with self.assertRaises(TypeError):
             self.e.coefficient(0)
         with self.assertRaises(TypeError):
@@ -44,7 +44,7 @@ class TestExpression(unittest.TestCase):
         self.assertEqual(self.e['x'], 1)
         self.assertEqual(self.e['y'], -2)
         self.assertEqual(self.e[self.y], -2)
-        self.assertEqual(self.e['z'], 0)
+        self.assertEqual(self.e['z'], 3)
         with self.assertRaises(TypeError):
             self.e[0]
         with self.assertRaises(TypeError):
@@ -54,7 +54,7 @@ class TestExpression(unittest.TestCase):
         self.assertCountEqual(self.e.coefficients(), [('x', 1), ('y', -2)])
 
     def test_constant(self):
-        self.assertEqual(self.x.constant, 0)
+        self.assertEqual(self.x.constant, 4)
         self.assertEqual(self.pi.constant, Fraction(22, 7))
         self.assertEqual(self.e.constant, 3)
 
@@ -99,6 +99,7 @@ class TestExpression(unittest.TestCase):
     def test_sub(self):
         self.assertEqual(self.x - self.x, 0)
         self.assertEqual(self.e - 3, self.x - 2*self.y)
+        self.assertEqual(0 - self.x, -self.x)
 
     def test_mul(self):
         self.assertEqual(self.pi * 7, 22)
@@ -111,7 +112,7 @@ class TestExpression(unittest.TestCase):
         self.assertEqual(self.e / 2, self.x / 2 - self.y + Fraction(3, 2))
 
     def test_str(self):
-        self.assertEqual(str(Expression()), '0')
+        self.assertEqual(str(Expression()), '5')
         self.assertEqual(str(self.x), 'x')
         self.assertEqual(str(-self.x), '-x')
         self.assertEqual(str(self.pi), '22/7')
@@ -159,7 +160,7 @@ class TestHelpers(unittest.TestCase):
         self.assertEqual(symbol('x'), self.x)
         self.assertNotEqual(symbol('y'), self.x)
         with self.assertRaises(TypeError):
-            symbol(0)
+            symbol(4)
 
     def test_symbols(self):
         self.assertListEqual(list(symbols('x y')), [self.x, self.y])