test_expect_success '-p handles "no changes" gracefully' '
HEAD=$(git rev-parse HEAD) &&
git rebase -i -p HEAD^ &&
+ git update-index --refresh &&
+ git diff-files --quiet &&
+ git diff-index --quiet --cached HEAD -- &&
test $HEAD = $(git rev-parse HEAD)
'
git checkout -b to-be-rebased &&
test_tick &&
git rebase -i -p --onto branch1 master &&
+ git update-index --refresh &&
+ git diff-files --quiet &&
+ git diff-index --quiet --cached HEAD -- &&
test $(git rev-parse HEAD~6) = $(git rev-parse branch1) &&
test $(git rev-parse HEAD~4^2) = $(git rev-parse to-be-preserved) &&
test $(git rev-parse HEAD^^2^) = $(git rev-parse HEAD^^^) &&