diff --git a/py_expression_eval/tests.py b/py_expression_eval/tests.py
index <HASH>..<HASH> 100755
--- a/py_expression_eval/tests.py
+++ b/py_expression_eval/tests.py
@@ -70,6 +70,7 @@ class ParserTestCase(unittest.TestCase):
         self.assertEqual(parser.parse("(a**2-b**2)==((a+b)*(a-b))").evaluate({'a': 4859, 'b': 13150}), True)
         self.assertEqual(parser.parse("(a**2-b**2+1)==((a+b)*(a-b))").evaluate({'a': 4859, 'b': 13150}), False)
         self.assertExactEqual(parser.parse("x/((x+y))").simplify({}).evaluate({'x':1, 'y':1}), 0.5)
+        self.assertExactEqual(parser.parse('origin+2.0').evaluate({'origin': 1.0}), 3.0)
 
         #functions
         self.assertExactEqual(parser.parse('pyt(2 , 0)').evaluate({}), 2.0)
add test with variable name starting with "or"