Unit Testing is one of the most adopted methodologies for high quality code. Its contribution to a more stable, independent and documented code is well proven . Unit test code is considered and handled as an a integral part of your repository, and as such requires development and maintenance. However, developers often encounter a situation where the resources invested in unit tests where not as fruitful as one would expect. In an ideal world every method we code will have a series of tests covering it’s code and validating it’s correctness. However, usually due to time limitations we either skip some tests or write poor quality ones. In such reality, while keeping in mind the amount of resources invested in unit testing development and maintenance, one must ask himself, given the available time, which code deserve testing the most? And from the existing tests, which tests are actually worth keeping and maintaining? See here

[我有一个观点，我不能在上面看到]

“每个人都在进行单元测试，他们不一定意识到这一点——事实”

想想看，你写了一个函数来解析一个字符串并删除新的行字符。作为一个开发新手，你要么在命令行中通过Main()实现它来运行几个用例，要么用一个按钮组合一个可视化前端，将你的函数绑定到几个文本框和一个按钮上，然后看看会发生什么。

这就是单元测试——基本的和糟糕的组合在一起，但是你测试了一些情况下的代码段。

你写一些更复杂的东西。当您抛出一些用例(单元测试)并将其调试到代码中并进行跟踪时，它会抛出错误。你在浏览过程中查看这些值，并决定它们是对还是错。在某种程度上，这是单元测试。

这里的单元测试实际上是采用这种行为，将其形式化为结构化模式并保存，以便您可以轻松地重新运行这些测试。如果您编写了一个“适当的”单元测试用例而不是手动测试，那么它所花费的时间是相同的，或者随着您的经验的增加可能会更少，并且您可以一次又一次地重复它

当您手动测试软件时，通常会使用一小组测试/操作。最终，您将自动修改输入数据或操作，以便围绕已知问题进行导航。应该有单元测试来提醒您某些事情不能正常工作。

我建议在编写代码之前编写测试，添加新的测试/数据来改进主代码的功能!

Unit Testing is one of the most adopted methodologies for high quality code. Its contribution to a more stable, independent and documented code is well proven . Unit test code is considered and handled as an a integral part of your repository, and as such requires development and maintenance. However, developers often encounter a situation where the resources invested in unit tests where not as fruitful as one would expect. In an ideal world every method we code will have a series of tests covering it’s code and validating it’s correctness. However, usually due to time limitations we either skip some tests or write poor quality ones. In such reality, while keeping in mind the amount of resources invested in unit testing development and maintenance, one must ask himself, given the available time, which code deserve testing the most? And from the existing tests, which tests are actually worth keeping and maintaining? See here

如果你正在使用NUnit，一个简单而有效的演示就是在他们面前运行NUnit自己的测试套件。看到一个真正的测试套件对代码库进行测试，胜过千言万语……

简而言之——是的。它们值得你付出每一分努力……在某种程度上。在一天结束的时候，测试仍然是代码，并且很像典型的代码增长，您的测试最终将需要重构，以便可维护和可持续。有一大堆的陷阱!当涉及到单元测试时，但是没有什么，我的意思是没有什么比丰富的单元测试集更能让开发人员更自信地进行更改了。

I'm working on a project right now.... it's somewhat TDD, and we have the majority of our business rules encapuslated as tests... we have about 500 or so unit tests right now. This past iteration I had to revamp our datasource and how our desktop application interfaces with that datasource. Took me a couple days, the whole time I just kept running unit tests to see what I broke and fixed it. Make a change; Build and run your tests; fix what you broke. Wash, Rinse, Repeat as necessary. What would have traditionally taken days of QA and boat loads of stress was instead a short and enjoyable experience.

提前准备，一点点额外的努力，当你不得不开始摆弄核心特性/功能时，它会给你带来十倍的回报。

我买了这本书——它是xUnit测试知识的圣经——它可能是我书架上被引用最多的书之一，我每天都在查阅它:链接文本