X-Git-Url: https://svn.cri.ensmp.fr/git/linpy.git/blobdiff_plain/841943174bb4d3b602e8e055592d8b54d1bb086d..98d00e8b628b571e133bcfa494c0e8f0ab781234:/tests/test_linear.py

diff --git a/tests/test_linear.py b/tests/test_linear.py
index 3912fd3..4636275 100644
--- a/tests/test_linear.py
+++ b/tests/test_linear.py
@@ -110,6 +110,7 @@ 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(self.x), 'x')
         self.assertEqual(str(-self.x), '-x')
         self.assertEqual(str(self.pi), '22/7')