public void TestReadNonExistentCoupleRelationship()
{
var person = tree.AddPerson(TestBacking.GetCreateMalePerson());
cleanup.Add(person);
var relationship = TestBacking.GetCreateInvalidRelationship();
var state = person.ReadRelationship(relationship);
Assert.Throws <GedcomxApplicationException>(() => state.IfSuccessful());
Assert.AreEqual(HttpStatusCode.NotFound, state.Response.StatusCode);
}