In TypeMock you can create a future mock object, for example:

public class ClassToTest
{   
    public ClassToTest()
    {
        var o = new Foo();
    }
}

[Test]
public void Test()
{
    var fakeFoo = Isolate.Fake.Instance<Foo>();

    Isolate.Swap.NextInstance<Foo>().With(fakeFoo);
}

Does MS Fakes have the same functionality as the above?

有帮助吗?

解决方案

I found a great example from this SO question which demonstrates how to fake future instances of objects. Here's an example from that question:

[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);
        }

    }
}

This looks like it will do the trick for me.

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