Fixed #23768 -- Rewrote template tests as unit tests.

tests/template_tests/syntax_tests/test_setup.py

@@ -0,0 +1,29 @@
+from django.conf import settings
+from django.test import TestCase
+
+from .utils import setup
+
+
+class SetupTests(TestCase):
+
+    def test_setup(self):
+        """
+        Let's just make sure setup runs cases in the right order.
+        """
+        cases = []
+
+        @setup({})
+        def method(self):
+            cases.append([
+                settings.TEMPLATE_STRING_IF_INVALID,
+                settings.TEMPLATE_DEBUG,
+            ])
+
+        method(self)
+
+        self.assertEqual(cases[0], ['', False])
+        self.assertEqual(cases[1], ['', False])
+        self.assertEqual(cases[2], ['INVALID', False])
+        self.assertEqual(cases[3], ['INVALID', False])
+        self.assertEqual(cases[4], ['', True])
+        self.assertEqual(cases[5], ['', True])