diff --git a/projects/calculator/calculator_test.py b/projects/calculator/calculator_test.py
index 39b1166..f2212e2 100644
--- a/projects/calculator/calculator_test.py
+++ b/projects/calculator/calculator_test.py
@@ -4,7 +4,7 @@
 class TestSum(unittest.TestCase):
     def test_sum(self):
         calculator= Calculator()
-        self.assertEqual(calculator.add(1, 2), 3)
+        self.assertEqual(calculator.add(1, 2), 4)
 
 if __name__ == '__main__':
     unittest.main()
\ No newline at end of file