fixes #268
Squashed commit of the following:

commit d40d0831d578af23559ea2a2544ceebc47f6df50
Author: Cheng Pan <379377944@qq.com>
Date:   Fri Jan 8 18:30:51 2021 +0800

    remove unused mockito

commit 386e7e4eb1c93006e302c41ffbc04d0acfaf9a9b
Author: Cheng Pan <379377944@qq.com>
Date:   Fri Jan 8 17:35:44 2021 +0800

    extract versions to properties