1 files changed, 19 insertions, 1 deletions
diff --git a/tests/template_tests/test_context.py b/tests/template_tests/test_context.py
index f810feda74..64d0df8d10 100644
--- a/tests/template_tests/test_context.py
+++ b/tests/template_tests/test_context.py
@@ -53,4 +53,22 @@ class ContextTests(TestCase):
     def test_context_comparable(self):
         test_data = {'x': 'y', 'v': 'z', 'd': {'o': object, 'a': 'b'}}
 
-        self.assertEquals(Context(test_data), Context(test_data))
+        self.assertEqual(Context(test_data), Context(test_data))
+
+        # Regression test for #21765
+        a = Context()
+        b = Context()
+        self.assertEqual(a, b)
+
+        # update only a
+        a.update({'a': 1})
+        self.assertNotEqual(a, b)
+
+        # update both to check regression
+        a.update({'c': 3})
+        b.update({'c': 3})
+        self.assertNotEqual(a, b)
+
+        # make contexts equals again
+        b.update({'a': 1})
+        self.assertEqual(a, b)