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From:   Junio C Hamano <gitster@pobox.com>
To:     lists@haller-berlin.de (Stefan Haller)
Cc:     anatoly.borodin@gmail.com (Anatoly Borodin), git@vger.kernel.org
Subject: Re: Limitiations of git rebase --preserve-merges --interactive
References: <1mu13z0.1hye7bq1uqj26sM%lists@haller-berlin.de>
Date:   Fri, 23 Sep 2016 08:37:00 -0700
In-Reply-To: <1mu13z0.1hye7bq1uqj26sM%lists@haller-berlin.de> (Stefan Haller's
        message of "Fri, 23 Sep 2016 12:40:29 +0200")
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lists@haller-berlin.de (Stefan Haller) writes:

> Thanks, this is interesting; I'm having trouble understanding the tests
> though. Some of them use rebase -p -i, but I don't understand why they
> use -i, or why that even works in a test (i.e. why it doesn't open an
> editor).

Upon starting up, tests dot-source t/test-lib.sh file and it
unsets most of GIT_* environment variables to obtain a stable
testing environment that is not affected by things that testers
may have in their environment.

There is EDITOR=: in t/test-lib.sh, which was added in 2006 before
GIT_EDITOR was invented.  That is the one in effect for git
subcommands that usually interacts with editors during the test,
unless specific tests further override it with test_set_editor
helper.