git rebase -i $base &&
git cat-file commit HEAD | sed -e 1,/^\$/d > actual-squash-fixup &&
test_cmp expect-squash-fixup actual-squash-fixup &&
+ git cat-file commit HEAD@{2} |
+ grep "^# This is a combination of 3 commits\." &&
+ git cat-file commit HEAD@{3} |
+ grep "^# This is a combination of 2 commits\." &&
git checkout to-be-rebased &&
git branch -D squash-fixup
'