Visual Studio单元测试用于不同的接口实现

Question

我需要对一个特定接口的两个实现类进行单元测试.单元测试类是通用的,涵盖了接口的所有必要测试.我想在测试单元类TestInitialize方法中实例化实现类.

有什么办法可以强制测试类使用不同的实现类实例运行两次.

[TestClass]
public class MyFixture
{
    [TestInitialize()]
    public void MyTestInitialize()
    {
        ITest mockInstance = new TestImplement1();
        //ITest mockInstance = new TestImplement2();
    }

    [TestMethod]
    public void Test1 ()
    {
        mockInstance.Func1();
        ...  
    }

    [TestMethod]
    public void Test2 ()
    {
        ...  
    }

    ...other unit tests

 }

Answer 1

对于这种模式,通常你会有一个带测试方法的基础测试类,然后你将它子类化并填写安装方法.所以它会变成这样:(我使用NUnit,所以如果测试框架方法稍微偏离,我会道歉)

// don't mark this one as TestClass!
public abstract class MyBaseFixture
{
    protected ITest mockInstance;

    [TestMethod]
    public void Test1 ()
    {
        Assert(this.mockInstance.Func1() == 0);
    }
}

[TestClass]
public class MyConcreteFixture : MyBaseFixture
{
    [TestInitialize]
    public void Setup()
    {
        this.mockInstance = new ConcreteInstance1();
    }
}    

[TestClass]
public class MyOtherConcreteFixture : MyBaseFixture
{
    [TestInitialize]
    public void Setup()
    {
        this.mockInstance = new ConcreteInstance2();
    }
}