Fixed #23516 -- Added caching of include tag Template objects

This also speeds up for loops that render the same template
multiple times.

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/template_tests/syntax_tests/test_if_changed.py b/tests/template_tests/syntax_tests/test_if_changed.py
index 09cdc34a88..ee67c64218 100644
--- a/tests/template_tests/syntax_tests/test_if_changed.py
+++ b/tests/template_tests/syntax_tests/test_if_changed.py
@@ -196,3 +196,17 @@ class IfChangedTests(SimpleTestCase):
         template = self.engine.from_string('{% ifchanged %}{% cycle "1st time" "2nd time" %}{% endifchanged %}')
         output = template.render(Context({}))
         self.assertEqual(output, '1st time')
+
+    def test_include(self):
+        """
+        #23516 -- This works as a regression test only if the cached loader
+        isn't used. Hence we don't use the @setup decorator.
+        """
+        engine = Engine(loaders=[
+            ('django.template.loaders.locmem.Loader', {
+                'template': '{% for x in vars %}{% include "include" %}{% endfor %}',
+                'include': '{% ifchanged %}{{ x }}{% endifchanged %}',
+            }),
+        ])
+        output = engine.render_to_string('template', dict(vars=[1, 1, 2, 2, 3, 3]))
+        self.assertEqual(output, "123")