add unset test
unset test pass
Revert "unset test pass"

This reverts commit 91fa9b2cf1eadcdd6b077534f6df0bbd498efd64.
Revert "add unset test"

This reverts commit a95f046401bd9f3d02dad4f5f87baa074f4b8841.
add test for get ufter unset
fix get ufter unset