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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

You should create the patch with "hg diff --git" to preserve moving. And then apply it with "hg import", not the patch command. Unfortunately Rietveld don't like patches in git format.

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nosy: +serhiy.storchaka

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