not getting the same precise error message, but perhaps the intent is the same?; anyway, updated views & some FTs, base.html for more dynamic error handling (tho incomplete)

src/apps/dashboard/tests/test_views.py

@@ -1,4 +1,5 @@
 from django.test import TestCase
+from django.utils import html
 from ..models import Item, List
 import lxml.html
 
@@ -56,6 +57,18 @@ class NewListTest(TestCase):
         new_list = List.objects.get()
         self.assertRedirects(response, f'/apps/dashboard/{new_list.id}/')
 
+    def test_validation_errors_are_sent_back_to_home_page_template(self):
+        response = self.client.post("/apps/dashboard/newlist", data={"item_text": ""})
+        self.assertEqual(response.status_code, 200)
+        self.assertTemplateUsed(response, "apps/dashboard/home.html")
+        expected_error = html.escape("You can't have an empty list item")
+        self.assertContains(response, expected_error)
+        
+    def test_invalid_list_items_never_save(self):
+        self.client.post("/apps/dashboard/newlist", data={"item_text": ""})
+        self.assertEqual(List.objects.count(), 0)
+        self.assertEqual(Item.objects.count(), 0)
+
 class NewItemTest(TestCase):
     def test_can_save_a_POST_request_to_an_existing_list(self):
         other_list = List.objects.create()