于今夕之何夕，唯读书以自省

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根据The Art of Unit Testing With Examples in .NET，好的unit test应该具备如下特点：

• It should be automated and repeatable.
• It should be easy to implement.
• Once it’s written, it should remain for future use.
• Anyone should be able to run it.
• It should run at the push of a button.
• It should run quickly.

如果这还不够，请回答下列问题，足以判断一个测试是否是好的unit test：

• Can I run and get results from a unit test I wrote two weeks or months or years ago?
• Can any member of my team run and get the results from unit tests I wrote two months ago?
• Can I run all the unit tests I’ve written in no more than a few minutes?
• Can I run all the unit tests I’ve written at the push of a button?
• Can I write a basic unit test in no more than a few minutes?

有任何一个问题的回答是“no”，对不起，您的测试不是unit test，而是integration test，书中对于此类测试定义如下：

Integration testing means testing two or more dependent software modules as a group.

因此，unit test的定义如下：

A unit test is an automated piece of code that invokes the method or class being tested and then checks some assumptions about the logical behavior of that method or class. A unit test is almost always written using a unit-testing framework. It can be written easily and runs quickly. It’s fully automated, trustworthy, readable, and maintainable.