我们可以对所有单元测试类仅使用一个ClassInitialize吗？

Question

I started an internship where my job consists of seting up unit tests on some projects.

I have already implemented dozens of tests and now I want to create a mechanism which restores the original database after or before each run.

I have the necessary scripts to create, populate and drop my database, but I don't want to call this mechanism each test classes, but instead call it just once.

Is it possible to create a ClassIniatialize() who is called only once when I start one or all the tests?

EDIT

All I/you need is to use AssemblyInitialize() and AssemblyCleanUp() and all is resolved, ;)

Answer 1

我/您所需要做的就是使用AssemblyInitialize（）和AssemblyCleanUp（） ，所有这些都将解决；;）

Answer 2

You could start a transaction on TestInitialize and do a rollback on TestCleanup . This approach would allow you to avoid data changes to perdure outside the scope of individual tests.

  [TestInitialize()]
  public void Initialize()
  {
     //Init DB Transaction
  }

  [TestCleanup()]
  public void Cleanup()
  {
     //Rollback DB Transaction, database returns to the initial state
  }

You'll need to have a previously populated test database to run test on.

As a side note, database access should be tested on integration test and not on unit test. Adding external dependencies is against unit test definition.

Check also about the possibility of using in memory SQLite , will be more suitable for testing database access that a production db engine.

Answer 3

You could create a base class and decorate a method in that base class with the ClassInitialize-attribute.

After that you just need to make sure that all your test-classes inherit from this base class.

Answer 4

ClassInitilize method will be called once for every testclass you have. You may implement it just once in a base testclass for example, but it will still be called once for every test class.