Fix assertions

subscribers/models.py

@@ -54,7 +54,11 @@ class Subscriber(models.Model):
     )
 
     def __str__(self):
-        return f"{self.email} {f'#{self.phone_number}' if self.phone_number is not None else ''}"
+        s = []
+        if self.email:        s.append(str(self.email))
+        if self.phone_number: s.append(str(self.phone_number))
+
+        return " ".join(s)
 
     @staticmethod
     def _filter_centers(centers, age_limit):

subscribers/tests/test_models.py

@@ -20,6 +20,9 @@ def setUp(self):
         self.subscriber2 = Subscriber.objects.create(
             phone_number="9999999999", district_id=1
         )
+        self.subscriber3 = Subscriber.objects.create(
+            email="[email protected]", phone_number="9999999999", pincode=222222, district_id=2
+        )
 
         self.test_centers = [
             {
@@ -149,6 +152,7 @@ def setUp(self):
     def test_str_method(self):
         self.assertEqual(str(self.subscriber1), "[email protected]")
         self.assertEqual(str(self.subscriber2), "+919999999999")
+        self.assertEqual(str(self.subscriber3), "[email protected] +919999999999")
 
     def test_filter_centers(self):
         filter_18 = Subscriber._filter_centers(self.parsed_test_centers, 18)