git rebase master
'
+test_expect_success 'rebase, with <onto> and <upstream> specified as :/quuxery' '
+ test_when_finished "git branch -D torebase" &&
+ git checkout -b torebase my-topic-branch^ &&
+ upstream=$(git rev-parse ":/Add B") &&
+ onto=$(git rev-parse ":/Add A") &&
+ git rebase --onto $onto $upstream &&
+ git reset --hard my-topic-branch^ &&
+ git rebase --onto ":/Add A" ":/Add B" &&
+ git checkout my-topic-branch
+'
+
test_expect_success 'the rebase operation should not have destroyed author information' '
! (git log | grep "Author:" | grep "<>")
'