c# - 使用基类进行集成测试

Question

我的集成测试基类:

[TestClass]
public class BaseIntegrationTest
{
    protected readonly ApplicationDbContext _dbContext;

    public BaseIntegrationTest()
    {
        _dbContext = new ApplicationDbContext("DefaultConnectionTest");
    }

    [ClassInitialize]
    public void Initialize()
    {
        InsertTestData();
    }

    public void InsertTestData()
    {
        _dbContext.Users.Add(new User { Name = "John Doe" });
    }
}

这是一个继承自 BaseIntegrationTest 的测试类:

[TestClass]
public class UserRepositoryTests : BaseIntegrationTest
{
    // how to lose this method here and use the one in the BaseIntegrationTest?
    //[ClassInitialize]
    //public static void Setup(TestContext context)
    //{
    //  BaseIntegrationTest test = new BaseIntegrationTest();
    //  test.InsertTestData();
    //}

    [TestMethod]
    public void GetUser()
    {
        Filter f = new Filter()
        {
            Name = "John Doe"
        };

        UserRepository fr = new UserRepository(_dbContext);
        var result = fr.GetUser(f);

        Assert.IsTrue(result.Any(x => x.Name == "John Doe"));
    }
}

BaseIntegrationTest 中用 [ClassInitialize] 属性修饰的方法永远不会被执行，因此，我的测试失败。没有数据被插入到数据库中。

但是，如果我取消注释 UserRepositoryTests 中的 public static void Setup(TestContext context) ，它就可以工作。

我还有一些想要测试的存储库。我希望将数据插入到基类中完成的数据库中，以便我可以运行所有测试，而无需为我想要测试的每个存储库重新创建数据库。

将 public void Initialize() 转换为 public static void Initialize(TestContext context) 也不起作用。 Initialize() 不会被执行/调用。

我错过了什么吗？或者这些是单元测试/集成测试的局限性？我对单元测试/集成测试还很陌生。

Answer 1

来自 MSDN:

Will the same approach that was used for [TestInitialize] work with [ClassInitialize] in a base class?

Not exactly, if you create a [ClassInitialize] attributed method in the base class it won’t ever get called unless you explicitly call it at the beginning of your derived test classes ClassInitialize method; which of course is nowhere near as nice as the above approach.

http://blogs.msdn.com/b/densto/archive/2008/05/16/using-a-base-class-for-your-unit-test-classes.aspx

稍后描述如何在继承类中的任何方法之前进行初始化:

How can I create an initialization method that will run before any class initialization methods in my test project?

Building on the common base class approach described above you could simply add a static constructor to your base class and either perform the initialization there or call the method that will perform the desired initialization. The resulting base class might look like this:

[TestClass]
public class TestBase
{
    static TestBase()
    {
        s_log = new StringBuilder();
        Log.AppendLine("TestBase.ctor()");
    }

    [TestInitialize]
    public void BaseTestInit()
    {
        Log.AppendLine("TestBase.BaseTestInit()");
    }

    [TestCleanup]
    public void BaseTestCleanup()
    {
        Console.WriteLine(Log.ToString());
    }

    public static StringBuilder Log
    {
        get { return s_log; }
    }

    static StringBuilder s_log;
}