Yup

something.cs

[TestFixture]
public class showing_you_my_junk
{
    private ISomething theSomethingA;
    private ISomething theSomethingB;
    private SomethingElse theClassUnderTest;
    
    [SetUp]
    public void SetUp()
    {
        theSomethingA = MockRepository.GenerateStub<ISomething>();
        theSomethingB = MockRepository.GenerateStub<ISomething>();
        
        theClassUnderTest = new SomethingElse(new [] { theSomethingA, theSomethingB });
    }
    
    [Test]
    public void look_at_these()
    {
        var someObject = Guid.New();
        
        theSomethingA.Stub(x => x.Matches()).Returns(true);
        theSomethingA.Stub(x => x.BuildIt()).Returns(someObject);
        
        theClassUnderTest.UseTheImplementations().ShouldEqual(someObject);
    }
}