[stdlib-sig] bootstrapping test suite

[Michael Foord]

Allison Randal wrote:
> For Pynie we're developing a bootstrapping test suite, which may be 
> useful to other implementations as they migrate to 3.x. It uses Robert 
> Collins' SubUnit, which decouples the testing framework from the 
> tests. So the testing framework runs in CPython (or any reasonably 
> complete Python 2.x implementation), while the tests run in Pynie. All 
> that's required to pass the first test is an implementation of 'print' 
> and string constants. The tests gradually build up in complexity 
> through numeric constants, operators, control structures, functions, 
> etc, and when we're done with them will walk all the way through to 
> supporting the full Python 3.x syntax. When the bootstrap is complete, 
> the test framework moves to Pynie too, integrated with the core 
> CPython test suite.

Isn't Subunit GPL? That could be an issue for some projects.

Michael
>
> It might eventually be useful to add to the py3k branch, though I 
> wouldn't include it in release tarballs. Or, if another repo is 
> started for the benchmark tests, the bootstrapping tests might be 
> added there. We'll contribute it to the PSF, anyway, so it's 
> available. It does depend on SubUnit, which isn't part of the standard 
> library. I can strip it down to a minimal subset of SubUnit's features 
> and include them in the test running script if that makes it more 
> generally useful.
>
> Right now the tests live in Lib/test/parrot in the Pynie repository, 
> but will likely move to Lib/test/bootstrap (suggestions on 
> Python-friendly naming welcome).
>
> Allison
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