100 percent test coverage achieved, patching a critical api bug in api.serializers and .views

src/apps/api/tests/integrated/test_views.py

@@ -24,7 +24,6 @@ class ListDetailAPITest(BaseAPITest):
         self.assertEqual(len(response.data["items"]), 2)
 
 class ListItemsAPITest(BaseAPITest):
-
     def test_can_add_item_to_list(self):
         list_ = List.objects.create(owner=self.user)
 
@@ -37,6 +36,28 @@ class ListItemsAPITest(BaseAPITest):
         self.assertEqual(Item.objects.count(), 1)
         self.assertEqual(Item.objects.first().text, "a new item")
 
+    def test_cannot_add_empty_item_to_list(self):
+        list_ = List.objects.create(owner=self.user)
+
+        response = self.client.post(
+            f"/api/lists/{list_.id}/items/",
+            {"text": ""},
+        )
+
+        self.assertEqual(response.status_code, 400)
+        self.assertEqual(Item.objects.count(), 0)
+
+    def test_cannot_add_duplicate_item_to_list(self):
+        list_ = List.objects.create(owner=self.user)
+        Item.objects.create(text="list item", list=list_)
+        duplicate_response = self.client.post(
+            f"/api/lists/{list_.id}/items/",
+            {"text": "list item"},
+        )
+
+        self.assertEqual(duplicate_response.status_code, 400)
+        self.assertEqual(Item.objects.count(), 1)
+
 class ListsAPITest(BaseAPITest):
     def test_get_returns_only_users_lists(self):
         list1 = List.objects.create(owner=self.user)