Announcing TC39 ECMAScript Test Suite Project - Test262

Allen Wirfs-Brock Allen.Wirfs-Brock at
Mon Jun 21 10:42:00 PDT 2010

The intent is a suite that tests an implementation against the actual requirement of the Ecma-262 standard. It will be based upon and similar to what you can already see in the Sputnik and ES5conform suites.  Those tests generally identify a specific requirement of a specific section of the spec. and then try to prove that the requirement is/isn't met by an implementation.

Give that the standard specification itself  is not particularly understandable to the general public, it probably isn't reasonable to expect that all the tests of the specification would be understandable to the same public.

However, reasonable understandability is a good goal.  What are some of the characteristics of the W3C suites that make them "acidic"?


> -----Original Message-----
> From: Jonathan Chetwynd [mailto:j.chetwynd at]
> Sent: Monday, June 21, 2010 1:40 AM
> To: Allen Wirfs-Brock
> Cc: es-discuss at
> Subject: Re: Announcing TC39 ECMAScript Test Suite Project - Test262
> Allen,
> is the Test262 test suite more similar to W3C  suites or might there be an acidic
> element?
> ie something the public might understand?
> regards
> Jonathan Chetwynd
> On 21 Jun 2010, at 06:52, Allen Wirfs-Brock wrote:
> > At the last TC39 meeting we agreed to launch a project to develop an
> > official ECMAScript specification test suite that developers and users
> > can use to verify that implementations accurately implement the
> > standard.  The hope is that we can integrate the various existing test
> > suites along with new tests to create a single comprehensive test
> > suite for the ECMAScript standard.
> >
> > Because of the nature of Ecma's intellectual property policies, only
> > Ecma members can directly contribute code to the project.  However,
> > the project code will be BSD licensed and development will be carried
> > out in a publically accessible manner.  The working name of the test
> > suite is Test262 and I'll be serving as the initial project editor.
> > The source code of the project will be hosted  in the TS39 repository
> > at  (coming soon) and issues will be tracked
> > at .  In addition, I'm setting up
> > a separate  test262-discuss mailing list for topics relating to
> > ECMAScript testing and the Test262 test suite. Test262-discuss is open
> > to the public. You can subscribe at t
> >
> >
> > I'm now in the early stages of organizing  the project infrastructure
> > and collecting initial code contributions from Ecma members. To kick
> > things off, Microsoft is contributing the ES5Confrom test suite as
> > well as a significant number of additional tests. Christian Plesner
> > Hansen, leader of the Sputnik project , reports that Google will
> > contribute their Sputnik code.  Other TC39 members have all been
> > supportive of this effort and I anticipate that we will receive
> > additional contributions from them in the near future.
> >
> > So, if you're interested in ECMAScript testing subscribe to test262-
> > discuss and join in.  After people have had a couple of days to
> > subscribe, I'll be kicking things off with some of my ideas about how
> > to structure and organize the Test262 suite. Please also share your
> > thoughts.
> >
> > Thanks,
> > Allen Wirfs-Brock
> >
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> > es-discuss at
> >

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