Make test randomness repeatable.

[davidmorgan]

The test tries to use repeatable random numbers, but depending on "Directory.list" order meant this did not always work.

Fix it by sorting before shuffling :)

[github-actions]

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Package	Version	Status	Publish tag (post-merge)
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package:coverage	1.15.0	already published at pub.dev
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package:stack_trace	1.12.2-wip	(error) pubspec version (1.12.2-wip) and changelog (1.12.2-dev) don't agree
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[davidmorgan]

I have further/related changes and fixes ready, I'll send as one PR :)