Untitled

Does it make a sense to write a unit test to check does it implement an interface?
public class ComparableCustomType: IComparable
    {
        private readonly someFields;

        public ComparableCustomType(AnotherBusinessObject obj)
        {
              //Do some parsing against the obj
        }

        public int CompareTo(object obj)
        {
             //Some custom sorting logic
        }
    }

[TestMethod]
public void CompareTo_IsImplementIComaparable()
{
      IComparable comparable = Isolate.Fake.Instance<ComparableCustomType>();
      Assert.AreNotEqual(null, comparable);
}

public class CustomItem{

    private AnotherBusinessObject anotherBusinessObj = null

    public CustomItem(AnotherBusinessObject obj)
    {
        this.anotherBusinessObj = obj;
    }

    public ComparableCustomType {
        get { return new CamparableCustomType(this.anotherBusinessObj); }
    }

    public string SomeOtherProperty {get;set;}

    publci int AnotherProperty {get;set;}

}

public ObservableCollection<CustomItem> MyCustomCollection {get;set;}

IComparable foo = new FooComparable();

IComparable dataSource = fooObj;