branchcache: simplify the branch rev cache test We don't need that many content dump and this gets in the way in change in access pattern (e.g. accessing revision in a different order change the order of branches in the "names" file). So we simplify this test in advance.

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To run the tests, do:

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cd tests/

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python run-tests.py

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See https://mercurial-scm.org/wiki/WritingTests for

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more information on writing tests.