bneradt commented on code in PR #13158:
URL: https://github.com/apache/trafficserver/pull/13158#discussion_r3262731158


##########
tests/gold_tests/headers/range_transform.test.py:
##########
@@ -0,0 +1,18 @@
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+tr = Test.ATSReplayTest(replay_file="replays/range_transform.replay.yaml")
+tr.Processes.Default.TimeOut = 10

Review Comment:
   Might not need this TimeOut set if we adjust the delay calls above.



##########
tests/gold_tests/headers/replays/range_transform.replay.yaml:
##########
@@ -0,0 +1,223 @@
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+# Verify RangeTransform on stale-revalidate
+#
+# Preconditions for the bug:
+#  1. Client request has a `Range` header.
+#  2. Cached object is stale, so ATS revalidates.
+#  3. Origin returns `200 OK` with the full body (not 304, not 206).
+#  4. The fresh `Content-Length` differs from the cached object size.
+
+meta:
+  version: '1.0'
+
+autest:
+  description: 'Verify RangeTransform'
+
+  dns:
+    name: "dns-range-transform"
+
+  server:
+    name: "server-range-transform"
+
+  client:
+    name: "client-range-transform"
+
+  ats:
+    name: "ts-range-transform"
+
+    process_config:
+      enable_cache: true
+
+    records_config:
+      proxy.config.http.wait_for_cache: 1
+      proxy.config.http.cache.required_headers: 0
+      proxy.config.diags.debug.enabled: 1
+      proxy.config.diags.debug.tags: 'http'
+
+    remap_config:
+      - from: "http://example.com/";
+        to: "http://backend.example.com:{SERVER_HTTP_PORT}/";
+
+    log_validation:
+      traffic_out:
+        contains:
+          - expression: 'perform_transform_cache_write_action 
CacheAction_t::REPLACE'
+            description: 'Stale cache is replaced via RangeTransform'
+
+sessions:
+  # Prime cache with BIG body.
+  - transactions:
+      - client-request:
+          method: "GET"
+          version: "1.1"
+          url: /obj
+          headers:
+            fields:
+              - [Host, example.com]
+              - [uuid, prime]
+
+        server-response:
+          status: 200
+          reason: OK
+          headers:
+            fields:
+              - [Date, "Mon, 01 Jan 2026 00:00:00 GMT"]
+              - [Cache-Control, "max-age=1, public"]
+              - [Content-Type, application/octet-stream]
+              - [Content-Length, 64097]
+          content:
+            size: 64097
+
+        proxy-response:
+          status: 200
+
+  # Stale revalidate: origin body shrunk to 40000, Range end (64096) 
unreachable.
+  - transactions:
+      - client-request:
+          delay: 1500ms

Review Comment:
   Nit.: 100ms should be plenty for IO. We use that elsewhere in the autests 
for cache IO. That will save a few seconds of test execution here.
   
   This applies to quite a few `delay:` calls in here.



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