[issue22390] test.regrtest should complain if a test doesn't remove temporary files

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> I would prefer to fix tests instead of trying to remove arbitrary files. I'm
> not sure that "fn.startswith(support.TESTFN)" check is safe enough.

This allow other tests which leaks the same file to be reported too.

support.TESTFN contains process ID so it is unique enough.

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<http://bugs.python.org/issue22390>
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