截止2018年7月5日,PowerMock最新版本1.7.4不兼容Mockito的版本2.18.3
而应该使用老版本2.8.47:
<properties>
<mockito.version>2.8.47</mockito.version>
<!-- <mockito.version>2.18.3</mockito.version> can't work for latest version of powermock -->
<powermock.version>1.7.4</powermock.version>
</properties>