1 files changed, 9 insertions, 0 deletions
diff --git a/Lib/json/tests/test_dump.py b/Lib/json/tests/test_dump.py
index 9a7c8cc..cd92569 100644
--- a/Lib/json/tests/test_dump.py
+++ b/Lib/json/tests/test_dump.py
@@ -19,5 +19,14 @@ class TestDump(object):
                 {2: 3.0, 4.0: 5L, False: 1, 6L: True}, sort_keys=True),
                 '{"false": 1, "2": 3.0, "4.0": 5, "6": true}')
 
+    # Issue 16228: Crash on encoding resized list
+    def test_encode_mutated(self):
+        a = [object()] * 10
+        def crasher(obj):
+            del a[-1]
+        self.assertEqual(self.dumps(a, default=crasher),
+                 '[null, null, null, null, null]')
+
+
 class TestPyDump(TestDump, PyTest): pass
 class TestCDump(TestDump, CTest): pass