amoghrajesh commented on code in PR #66859:
URL: https://github.com/apache/airflow/pull/66859#discussion_r3271592624


##########
shared/state/tests/state/test_state.py:
##########
@@ -70,3 +70,71 @@ def test_abstract_methods_cover_full_interface(self):
         """BaseStateBackend enforces all 8 sync+async methods as abstract."""
         expected = {"get", "set", "delete", "clear", "aget", "aset", 
"adelete", "aclear"}
         assert BaseStateBackend.__abstractmethods__ == expected
+
+    def test_task_state_serialize_deserialize_round_trip(self, backend):
+        original = "app_1234"
+        serialized = backend.serialize_task_state_to_ref(value=original, 
key="job_id", ti_id="abc-123")
+        deserialized = backend.deserialize_task_state_from_ref(serialized)
+        assert deserialized == original
+
+    def test_custom_backend_overrides_task_state_ser_deser(self):
+        class MyBackend(BaseStateBackend):
+            def get(self, scope, key): ...
+            def set(self, scope, key, value): ...
+            def delete(self, scope, key): ...
+            def clear(self, scope, *, all_map_indices=False): ...
+            async def aget(self, scope, key): ...
+            async def aset(self, scope, key, value): ...
+            async def adelete(self, scope, key): ...
+            async def aclear(self, scope, *, all_map_indices=False): ...
+
+            def serialize_task_state_value(self, *, value, key, ti_id):

Review Comment:
   Fixed — renamed `serialize_task_state_value`/`deserialize_task_state_value` 
to `serialize_task_state_to_ref` / `deserialize_task_state_from_ref` and same 
for asset state. 
   
   The end-to-end hook is already verified through `TaskStateAccessor` in 
`test_task_state_set_sends_reference_via_custom_backend` / 
`test_asset_state_set_sends_reference_via_custom_backend` in 
`test_task_runner.py`



##########
shared/state/tests/state/test_state.py:
##########
@@ -70,3 +70,71 @@ def test_abstract_methods_cover_full_interface(self):
         """BaseStateBackend enforces all 8 sync+async methods as abstract."""
         expected = {"get", "set", "delete", "clear", "aget", "aset", 
"adelete", "aclear"}
         assert BaseStateBackend.__abstractmethods__ == expected
+
+    def test_task_state_serialize_deserialize_round_trip(self, backend):
+        original = "app_1234"
+        serialized = backend.serialize_task_state_to_ref(value=original, 
key="job_id", ti_id="abc-123")
+        deserialized = backend.deserialize_task_state_from_ref(serialized)
+        assert deserialized == original
+
+    def test_custom_backend_overrides_task_state_ser_deser(self):
+        class MyBackend(BaseStateBackend):
+            def get(self, scope, key): ...
+            def set(self, scope, key, value): ...
+            def delete(self, scope, key): ...
+            def clear(self, scope, *, all_map_indices=False): ...
+            async def aget(self, scope, key): ...
+            async def aset(self, scope, key, value): ...
+            async def adelete(self, scope, key): ...
+            async def aclear(self, scope, *, all_map_indices=False): ...
+
+            def serialize_task_state_value(self, *, value, key, ti_id):
+                return f"s3://bucket/{ti_id}/{key}"
+
+            def deserialize_task_state_value(self, stored):
+                return f"fetched:{stored}"
+
+        b = MyBackend()
+        assert (
+            b.serialize_task_state_value(value="app_1234", key="job_id", 
ti_id="abc-123")
+            == "s3://bucket/abc-123/job_id"
+        )
+        assert (
+            b.deserialize_task_state_value("s3://bucket/abc-123/job_id")
+            == "fetched:s3://bucket/abc-123/job_id"
+        )
+
+    def test_asset_state_serialize_deserialize_round_trip(self, backend):
+        original = "2026-05-01"
+        serialized = backend.serialize_asset_state_to_ref(
+            value="2026-05-01", key="watermark", asset_ref="my_asset"
+        )
+        deserialized = backend.deserialize_asset_state_from_ref(serialized)
+        assert deserialized == original
+
+    def test_custom_backend_overrides_asset_state_ser_deser(self):
+        class MyBackend(BaseStateBackend):
+            def get(self, scope, key): ...
+            def set(self, scope, key, value): ...
+            def delete(self, scope, key): ...
+            def clear(self, scope, *, all_map_indices=False): ...
+            async def aget(self, scope, key): ...
+            async def aset(self, scope, key, value): ...
+            async def adelete(self, scope, key): ...
+            async def aclear(self, scope, *, all_map_indices=False): ...
+
+            def serialize_asset_state_value(self, *, value, key, asset_ref):
+                return f"s3://bucket/assets/{asset_ref}/{key}"

Review Comment:
   Same as above



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