test(ITcpSocketFactory): improve code coverage (#6387)

* test: 增加连接延时

* refactor: 精简单元测试

* wip: 临时注移除单元测试

* refactor: 精简代码移除 ITcpSocketClient 实现类

* test: 更新单元测试

* test: 增加连接取消单元测试

* revert: 撤销单元测试

* test: 更新单元测试

Author: ArgoZhang