diff --git a/src/lists/tests.py b/src/lists/tests.py
index e78f3d9..56bfe48 100644
--- a/src/lists/tests.py
+++ b/src/lists/tests.py
@@ -21,6 +21,35 @@ class NewListTest(TestCase):
         new_list = List.objects.first()
         self.assertRedirects(response=response, expected_url=f'/lists/{new_list.id}/')
 
+class NewItemTest(TestCase):
+
+    def test_can_save_a_POST_request_to_an_existing_list(self):
+        other_list = List.objects.create()
+        correct_list = List.objects.create()
+
+        self.client.post(
+            f'/lists/{correct_list.id}/add_item', 
+            data={'item_text': 'A new item for an existing list'}
+        )
+
+        self.assertEqual(Item.objects.count(), 1)
+        new_item = Item.objects.first()
+        self.assertEqual(new_item.text, 'A new item for an existing list')
+        self.assertEqual(new_item.list, correct_list)
+
+    def test_redirects_to_list_view(self):
+        other_list = List.objects.create()
+        correct_list = List.objects.create()
+
+        response = self.client.post(
+            f'/lists/{correct_list.id}/add_item', 
+            data={'item_text': 'A new item for an existing list'}
+        )
+
+        self.assertRedirects(
+            response=response, 
+            expected_url=f'/lists/{correct_list.id}/')
+
 class ListViewTest(TestCase):
 
     def test_uses_list_template(self):