tests: add test showing that `hg uncommit --rev` can fail to mark file added The test case modified in this commit uses `hg uncommit --rev 0 b` to revert the parent commit's state to revision 0 where file `b` doesn't exist. The file is still tracked in the dirstate (correctly, since `hg uncommit` should not affected the tracked-ness), so `hg status` should report it as added. However, as the calls added in this patch shows, it gets reported as modified instead.