RFR: 1990: Fix MailingListNotifierTests#testMailingListBranch

Mon Aug 14 13:58:32 UTC 2023

On Fri, 11 Aug 2023 18:01:07 GMT, Zhao Song <zsong at openjdk.org> wrote:

> Due to [SKARA-1979](https://bugs.openjdk.org/browse/SKARA-1979), when generating a notification email for the first branch of a repository, all refs except pr/X branches are regarded as potential candidates. 
> 
> Therefore, this test sometimes fails because the master branch and testlock branch are identical, and it's uncertain which one will be selected as the base for the new branch.

Would it be possible to change the test so that we don't have two equivalent branches.

Marked as reviewed by erikj (Lead).

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PR Review: https://git.openjdk.org/skara/pull/1543#pullrequestreview-1576899886
PR Review: https://git.openjdk.org/skara/pull/1543#pullrequestreview-1576900266