Fixed #34823 -- Fixed assertTemplateUsed() context manager crash on unnamed templates.

django/test/testcases.py

@@ -114,18 +114,16 @@ class _AssertTemplateUsedContext:
         self.count = count
 
         self.rendered_templates = []
-        self.rendered_template_names = []
         self.context = ContextList()
 
     def on_template_render(self, sender, signal, template, context, **kwargs):
         self.rendered_templates.append(template)
-        self.rendered_template_names.append(template.name)
         self.context.append(copy(context))
 
     def test(self):
         self.test_case._assert_template_used(
             self.template_name,
-            self.rendered_template_names,
+            [t.name for t in self.rendered_templates if t.name is not None],
             self.msg_prefix,
             self.count,
         )
@@ -143,8 +141,11 @@ class _AssertTemplateUsedContext:
 
 class _AssertTemplateNotUsedContext(_AssertTemplateUsedContext):
     def test(self):
+        rendered_template_names = [
+            t.name for t in self.rendered_templates if t.name is not None
+        ]
         self.test_case.assertFalse(
-            self.template_name in self.rendered_template_names,
+            self.template_name in rendered_template_names,
             f"{self.msg_prefix}Template '{self.template_name}' was used "
             f"unexpectedly in rendering the response",
         )

tests/test_utils/tests.py

@@ -26,6 +26,7 @@ from django.forms import (
     formset_factory,
 )
 from django.http import HttpResponse
+from django.template import Context, Template
 from django.template.loader import render_to_string
 from django.test import (
     SimpleTestCase,
@@ -530,12 +531,20 @@ class AssertTemplateUsedContextManagerTests(SimpleTestCase):
             with self.assertTemplateUsed("template_used/base.html"):
                 render_to_string("template_used/alternative.html")
 
-        with self.assertRaisesMessage(
-            AssertionError, "No templates used to render the response"
-        ):
+        msg = "No templates used to render the response"
+        with self.assertRaisesMessage(AssertionError, msg):
             response = self.client.get("/test_utils/no_template_used/")
             self.assertTemplateUsed(response, "template_used/base.html")
 
+        with self.assertRaisesMessage(AssertionError, msg):
+            with self.assertTemplateUsed("template_used/base.html"):
+                self.client.get("/test_utils/no_template_used/")
+
+        with self.assertRaisesMessage(AssertionError, msg):
+            with self.assertTemplateUsed("template_used/base.html"):
+                template = Template("template_used/alternative.html", name=None)
+                template.render(Context())
+
     def test_msg_prefix(self):
         msg_prefix = "Prefix"
         msg = f"{msg_prefix}: No templates used to render the response"