              e.exception.chain[0].tried[0][0].template_name,
              'template_loader/unknown.html',
          )
          self.assertEqual(
              e.exception.chain[-1].tried[0][0].template_name,
              'template_loader/missing.html',
          )
 
</s> remove             e.exception.tried[0][0].template_name,
 </s> add             e.exception.chain[0].tried[0][0].template_name, </s> remove             e.exception.tried[0][0].template_name,
 </s> add             e.exception.chain[0].tried[0][0].template_name, </s> remove             e.exception.tried[-1][0].template_name,
 </s> add             e.exception.chain[-1].tried[0][0].template_name, </s> remove             e.exception.tried[-1][0].template_name,
 </s> add             e.exception.chain[1].tried[0][0].template_name,
            'template_loader/unknown.html',
        )
        self.assertEqual(e.exception.chain[1].backend.name, 'django')
        self.assertEqual(
            e.exception.chain[2].tried[0][0].template_name,
            'template_loader/missing.html',
        )
        self.assertEqual(e.exception.chain[2].backend.name, 'dummy')
        self.assertEqual(
            e.exception.chain[3].tried[0][0].template_name,
        self.assertEqual(e.exception.chain[0].backend.name, 'dummy')
              e.exception.chain[0].tried[0][0].template_name,
              'template_loader/unknown.html',
          )
        self.assertEqual(e.exception.chain[0].backend.name, 'dummy')
          self.assertEqual(
              e.exception.chain[-1].tried[0][0].template_name,
              'template_loader/missing.html',
          )
keep keep add keep keep keep keep
 Fixed #24119, #24120 -- Formalized debug integration for template backends. 
tests/template_loader/tests.py