[docs][zh] translated testing.md

docs/zh/guide/testing.md

 # Testing
 
-- [Vue CLI](https://github.com/vuejs/vue-cli) offers pre-configured unit testing and e2e testing setups.
+- [Vue CLI](https://github.com/vuejs/vue-cli) 提供了预配置的单元测试和 e2e 测试安装。
 
-- If you are interested in manually setting up unit tests for `*.vue` files, consult the docs for [@vue/test-utils](https://vue-test-utils.vuejs.org/en/), which covers setup with [mocha-webpack](https://vue-test-utils.vuejs.org/en/guides/testing-SFCs-with-mocha-webpack.html) or [Jest](https://vue-test-utils.vuejs.org/en/guides/testing-SFCs-with-jest.html).
+- 如果你有兴趣为 `*.vue` 文件手动设置单元测试，请咨询 [@vue/test-utils](https://vue-test-utils.vuejs.org/zh-cn/) 的文档，这份文档涵盖了对 [mocha-webpack](https://vue-test-utils.vuejs.org/zh-cn/guides/testing-SFCs-with-mocha-webpack.html) 或 [Jest](https://vue-test-utils.vuejs.org/zh-cn/guides/testing-SFCs-with-jest.html) 的设置。