Re: [PATCH 1/4] t5510: start tracking-ref tests from a known state

> are updated by various fetches and pulls; the first two
> should not update the ref, and the third should. Each test
> depends on the state left by the test before.
>
> This is fragile (a failing early test will confuse later
> tests), and means we cannot add more "should update" tests
> after the third one.
>
> Let's instead save the initial state before these tests, and
> then reset to a known state before running each test.
>
> Signed-off-by: Jeff King <peff@peff.net>