[issue9517] Make test.script_helper more comprehensive, and use it in the test suite

[Rodrigue Alcazar]

Rodrigue Alcazar added the comment:

@Mark, I had a look at the time I commented on the ticket but didn't get a chance to progress much in the end.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9517>
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