Re: [PATCH v3] rebase: add a config option for --no-fork-point

Denton Liu [off-list ref] writes:

I don't think this test is quite necessary. In other parts of the
code, we've already tested that local configs have priority over
global configs. We can assume that config machinery works so we
don't need to test it here.

I am not so sure if we should place so much trust in the code of
"rebase", or any other subsystem for that matter, that it uses the
configuration API and parse-options API correctly.

The do_test_rebase helper introduced here would be useful clean-up
on its own, so I'd rather take it as-is.