[webkit-dev] platform-specific differences in test case inputs

Adam Barth abarth at webkit.org
Tue Sep 18 12:36:07 PDT 2012

This is an interesting case because it's important for the
serialization format to be consistent across time (so that an
IndexedDB created at one point in time can work at another point in
time), but it's not important to be consistent across embedders
(because IndexedDB created by Safari don't need to be readable by
Chrome and vice versa).

Perhaps we shouldn't use LayoutTests to test this functionality.
Instead, it might make more sense to use API-level tests that check
that a particular embedder API is stable and working as expected.


On Tue, Sep 18, 2012 at 12:19 PM, Alec Flett <alecflett at chromium.org> wrote:
> Background: some of the storage systems use SerializedScriptValue to persist
> structured-clonable objects
> (http://www.w3.org/TR/html5/common-dom-interfaces.html#safe-passing-of-structured-data)
> - most of this is implemented in a V8 or JSC-specific implementation of
> SerializedScriptValue.
> I'm adding tests for the actual values stored with SerializedScriptValue so
> that we can move forward with serialization changes without breaking
> backwards compatibility.
> So many of my js tests boil down to:
> testSerialization({}, [0x01ff, 0x003f, 0x7b6f, 0x0000]);
> Which makes sure that these two representations are equivalent by going in
> both directions.
> The issue I'm hitting is that JSC has a different implementation with a
> different storage format, and the serialization/deserialization between the
> two storage formats is not compatible - the above code works great on V8 but
> JSC uses different bytes.
> I can't address this with just expectations files (i.e. only check that {}
> serializes to some byte array, and have different expectations depending on
> the port) because I need to check that specific inputs (such as old V8-based
> formats) can also deserialize back into the right native objects.
> What I kind of want is something like:
> #ifdef JSC
> <script src="serialized_script_tests_jsc.js"> </script>
> #endif
> #ifdef V8
> <script src="serialized_script_tests_v8.js"> </script>
> #endif
> Thoughts?
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