Signed-off-by: haozi007 <liuhao27@huawei.com> (cherry picked from commit 244b9728646d06f25f4581a0a419e58cca5e68f0)
update coverage of ut Signed-off-by: haozi007 <liuhao27@huawei.com> (cherry picked from commit e1d8a046299e003c1e8a2d9031603d7a89ed9029)