diff --git a/test_add.py b/test_add.py
index 3e51fb5..ee074bd 100644
--- a/test_add.py
+++ b/test_add.py
@@ -5,3 +5,6 @@ def test_add_positive():
 
 def test_add_zero():
     assert add(0, 5) == 5
+
+def test_add_with_negative():
+    assert add(-1, -2) == -3