How do I get shims for base classes using Microsoft Fakes?

Question

class Parent{
   public string Name{ get; set; }
}

class Child :Parent{
   public string  address{ get; set; }
}

[TestClass]
class TestClass{
   [TestMethod]
   public void TestMethod()
   {
      var c = new Fakes.Child();
      c.addressGet = "foo"; // I can see that
      c.NameGet = "bar"; // This DOES NOT exists
   }
}

How can I set the "name" in the above code sample?

Answer 1

The generated class for Parent will have a constructor that looks like: ShimParent(Parent p).

All you need to do is:

var child = new ShimChild();
var parent = new ShimParent(child);

And set the appropriate values on the respective Shim's.

Answer 2

You'll have to declare it on the base class. The easiest way is to call the base class its AllInstances property:

[TestClass]
public class UnitTest1
{
    [TestMethod]
    public void TestMethod1()
    {
        ClassLibrary1.Child myChild = new ClassLibrary1.Child();

        using (ShimsContext.Create())
        {
            ClassLibrary1.Fakes.ShimChild.AllInstances.addressGet = (instance) => "foo";
            ClassLibrary1.Fakes.ShimParent.AllInstances.NameGet = (instance) => "bar";

            Assert.AreEqual("foo", myChild.address);
            Assert.AreEqual("bar", myChild.Name);
        }

    }
}

Also always try to add the ShimsContext to ensure the proper cleaning of your shim. Otherwise your other unit tests will also get the values returned that you have declared before. Information on ShimsContext can be found here: http://msdn.microsoft.com/en-us/library/hh549176.aspx#ShimsContext