diff --git a/tests/test_whatsapp.py b/tests/test_whatsapp.py
index 1476eb0..a9cdaa4 100644
--- a/tests/test_whatsapp.py
+++ b/tests/test_whatsapp.py
@@ -8,6 +8,7 @@ def test_check_whatsapp_contacts(client):
     contacts = ['+55 1 55 1234 5678', '123']
     result = client.check_whatsapp_contacts('5215500000000', contacts)
     assert '+55 1 55 1234 5678' in result  # whatsapp
+    assert result['+55 1 55 1234 5678'] == '5515512345678'
     assert '123' not in result  # no whatsapp