如何使用Microsft Fakes框架对抽象类进行单元测试

Question

I have the following abstract class for which I want to write a unit test. I am new to Microsoft Fakes and so far I have only used it for testing public classes.

public abstract class ProvideBase 
{
    private string tag = string.Empty;

    public string Tag
    {
        get { return tag; }         
        set { tag = value; }
    }

}

public static String GetMyConfig(string sectionName)
{
    MyConfiguration config = MyConfiguration.GetConfig(sectionName);
    return config.GetMyConfig(config.DefaultConfig);
}

I wrote a unit test for my GetMyConfig() method. My test coverage is not 100% however, since I have not used the Tag property. Is there a way I can test it to?

Pex does some kind of mocking to test such things. How do I mock/test the Tag property using Microsoft Fakes?

Answer 1

I'm not really sure why you want to use Fakes for this. Deriving a class from it makes it easy enough to test:

class TestableProvideBase : ProvideBase{}

[TestMethod]
public void TestTagProperty() {
    var sut = new TestableProvideBase();

    Assert.AreEqual(String.Empty, sut.Tag);

    sut.Tag = "someValue";

    Assert.AreEqual("someValue", sut.Tag);
}

Answer 2

to mock a property of the parent class I am using the following syntax

bool tagPropertyGot = false;
ShimProvideBase.AllInstances.TagGet = (i) => {
    if (i.Equals(myTestingTargetInstance))
    {
        tagPropertyGot = true;
        return "otherTagValue";
    }
    return "tagvalue";
};