This test checks that the "-l" option creates a reflog. But
in fact we'd create one even without it, since the default
in a non-bare repository is to do so. Let's unset the config
so we can be sure our "-l" option is kicking in.
Note that we can't do this with test_config, since that
would leave the variable unset after our test finishes,
confusing downstream tests (the helper is not smart enough
to restore the previous value, and just always runs
test_unconfig).
Signed-off-by: Jeff King <peff@peff.net> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Reviewed-by: Jacob Keller <jacob.keller@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>