tests: synchronize the git and Mercurial username The problem with the default name of "test" set by the test runner is the stringutil methods are unable to split out separate user and email addresses that git wants. This means the username is recorded in git as "test <test>". Amending a commit with that user ends up trying to use "<test>" as the person field for the new commit, and the git library complains about the angle brackets. We should probably abort with a clearer message any time this bad form is used with the git extension. One of the commit dates is tweaked to recreate the ambiguous hash prefix from before. Differential Revision: https://phab.mercurial-scm.org/D10531

git: initialize `extra` to have at least the branch name for nullid Otherwise, this crashes trying to convert to local encoding: ... File "/mnt/c/Users/Matt/hg/mercurial/logcmdutil.py", line 333, in _show branch = ctx.branch() File "/mnt/c/Users/Matt/hg/mercurial/context.py", line 675, in branch return encoding.tolocal(self._changeset.extra.get(b"branch")) File "/mnt/c/Users/Matt/hg/mercurial/encoding.py", line 181, in tolocal if isasciistr(s): TypeError: a bytes-like object is required, not 'NoneType' This was originally reported to the thg bug tracker. https://foss.heptapod.net/mercurial/tortoisehg/thg/-/issues/5629 Differential Revision: https://phab.mercurial-scm.org/D10528

git: consistently use str for parents when rebuilding the index database The tests show no changes, but when these values are overwritten shortly after when a git commit object is available, that uses str. It seems better to use that for consistency. It does materially affect the database though, because the old value stored was `X'3030..3030'` and is now '00..00' when the changelog table is dumped in sqlite3. There is one query that specifies the parents, but it passes the non null hashes as str, so it worked as expected. That likely explains the lack of test changes. Differential Revision: https://phab.mercurial-scm.org/D10527