Fixed #28935 -- Fixed display of errors in extended blocks.

Get the template that caused the exception and get the
exception info from that template, using the node that
caused the exception.

3 files changed, 19 insertions, 1 deletions

diff --git a/tests/template_tests/templates/test_extends_block_error.html b/tests/template_tests/templates/test_extends_block_error.html
new file mode 100644
index 0000000000..c4733747a2
--- /dev/null
+++ b/tests/template_tests/templates/test_extends_block_error.html
@@ -0,0 +1,2 @@
+{% extends "test_extends_block_error_parent.html" %}
+{% block content %}{% include "missing.html" %}{% endblock %}
diff --git a/tests/template_tests/templates/test_extends_block_error_parent.html b/tests/template_tests/templates/test_extends_block_error_parent.html
new file mode 100644
index 0000000000..cb0dbe444b
--- /dev/null
+++ b/tests/template_tests/templates/test_extends_block_error_parent.html
@@ -0,0 +1 @@
+{% block content %}{% endblock %}
diff --git a/tests/template_tests/tests.py b/tests/template_tests/tests.py
index a8f089c351..5ea026723e 100644
--- a/tests/template_tests/tests.py
+++ b/tests/template_tests/tests.py
@@ -1,11 +1,14 @@
 import sys
 
 from django.contrib.auth.models import Group
-from django.template import Context, Engine, TemplateSyntaxError
+from django.template import (
+    Context, Engine, TemplateDoesNotExist, TemplateSyntaxError,
+)
 from django.template.base import UNKNOWN_SOURCE
 from django.test import SimpleTestCase, override_settings
 from django.urls import NoReverseMatch
 from django.utils import translation
+from django.utils.html import escape
 
 
 class TemplateTests(SimpleTestCase):
@@ -134,6 +137,18 @@ class TemplateTests(SimpleTestCase):
             t.render(Context())
         self.assertEqual(e.exception.template_debug['during'], '{% badtag %}')
 
+    def test_render_tag_error_in_extended_block(self):
+        """Errors in extended block are displayed correctly."""
+        e = Engine(app_dirs=True, debug=True)
+        template = e.get_template('test_extends_block_error.html')
+        context = Context()
+        with self.assertRaises(TemplateDoesNotExist) as cm:
+            template.render(context)
+        self.assertEqual(
+            cm.exception.template_debug['during'],
+            escape('{% include "missing.html" %}'),
+        )
+
     def test_super_errors(self):
         """
         #18169 -- NoReverseMatch should not be silence in block.super.