I shared this on the JSON Yahoo! group list, but this seems relevant
here, now. I extracted tests from the YUI JSON test suite for Native
JSON support.
http://github.com/lsmith/JSON-test-suite/tree/master
Great to see the sharing of tests!
Luke
On Aug 26, 2009, at 3:37 PM, Oliver Hunt wrote:
2) The grammar and an existing test in the json.org test suite
disallows final commas in array input (JSON.parse('[1,]') should
apparently throw) - IE8, Safari 4 and Firefox 3.5 all seem to
happily accept it though, as does the yet-to-go-public Opera
implementation. I'd like some reassurance from other browser
vendors that you consider this a bug and intend to fix it before I
push for a fix here because this is the kind of thing that might
cause compat problems :-o (Guess this is more a question for the
implementers on the list than for the spec authors.)
This is definitely a bug in the WebKit implementation (we disallow
the trailing comma in object literals, i'm saddened that we allow
the trailing comma in [] :-/ )
4) (Editorial) - spec says "The abstract operation Str(key, holder)
has access to
PropertyList and ReplacerFunction" - the algorithm does not
actually use
PropertyList (very trivial issue, of course)
PropertyList is used in the abstract function JO
Quick word about the test suite: it's current home is http://testsuites.opera.com/JSON/
where you can have a look at the README, load runner.htm to run
all tests (Warning: if you do that in IE8 something makes it eat
all your memory and make the PC entirely unusable!) or browse
through folders to individual tests. Hope it's useful to all you
implementers out there. Feedback welcome :)
There are also reasonably extensive tests in the WebKit repository
-- unfortunately they are designed primarily as regression tests so
their output isn't astonishingly nice -- Browsers without a native
JSON implementation just fail everything somewhat catastrophically
with no obvious indication as to why. That said the tests do cover
most edge cases (although not the [] with terminating comma thing
apparently :-( ) such as order of execution, number of times
properties are accessed, etc.
http://trac.webkit.org/export/HEAD/trunk/LayoutTests/fast/js/JSON-stringify-replacer.html
http://trac.webkit.org/export/HEAD/trunk/LayoutTests/fast/js/JSON-parse.html
http://trac.webkit.org/export/HEAD/trunk/LayoutTests/fast/js/JSON-stringify.html
(this one takes quite a while)
--Oliver
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