make customer name required field.

tienda_ilusion/don_confiao/tests/test_party.py

@@ -1,5 +1,7 @@
 #!/usr/bin/env python3
 from django.test import TestCase
+from django.db.utils import IntegrityError
+
 from ..models import Customer
 
 
@@ -12,3 +14,8 @@ class TestCustomer(TestCase):
         customer.save()
 
         self.assertIsInstance(customer, Customer)
+
+    def test_don_create_customer_without_name(self):
+        customer = Customer()
+        with self.assertRaises(IntegrityError):
+            customer.save()