> For the complete documentation index, see [llms.txt](https://ethan-lin.gitbook.io/refactoring/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ethan-lin.gitbook.io/refactoring/xiang-jin-mei-gui/4-task-2.md).

# 任务2：添加安全网

作为向祖传代码发起挑战的第一步，**永远是先搭建一张测试的安全网**，这张安全网需要有这样的特点：

* **必须很容易使用**。最好是按一个快捷键就能整个运行它，这样我们才可能频繁执行它
* **必须非常直观**。我们不想做人工的比对，最好是由它快速告诉我们测试是否失败，前后差别是什么
* **必须覆盖全面**。姑且不说 100%的覆盖率，如果没有 90%以上的覆盖率，怎么好意思说自己是一张“安全”网呢？

如果你想的是先添加单元测试，你可能会遇到挫折，一是因为难以找到一个合适的“单元”切入进行测试，二是难以保证全面的覆盖率。你需要开动脑筋，找到系统的入口点和输出点，仔细寻找有没有可以用来记录系统行为的用例。

此外，你还需要严格遵循这个规则：**在安全网搭建好之前不能修改产品代码**。我们可不想意外地修改代码的行为。

![](/files/-LrtW0nj2rUYC40bFn0J)

## 你的任务

Java：

```
git clone git@github.com:linesh-simplicity/gildedrose-java.git
git checkout task-2-safety-net
./gradlew clean build
```

JavaScript：

```
git clone git@github.com:linesh-simplicity/gildedrose.git
git checkout task-2-safety-net
npm i
npm test
```

1. 给代码编写自动化的测试安全网
2. 不允许对产品代码做任何修改
3. 测试覆盖率不低于 95%
4. 能够通过一个快捷键运行测试
5. 能够自动化报告测试结果

## 反思

* 过程中有没有遇到纠结的情况？


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