test $parent = $(git rev-parse HEAD^)
'
+test_expect_success 'rebase a detached HEAD' '
+ grandparent=$(git rev-parse HEAD~2) &&
+ git checkout $(git rev-parse HEAD) &&
+ test_tick &&
+ FAKE_LINES="2 1" git rebase -i HEAD~2 &&
+ test $grandparent = $(git rev-parse HEAD~2)
+'
+
test_done