public void OwningDtoTest()
        {
            var dtos = new HashSet <DomainObjectDTO>();
            // 1. Add barebones LP.
            const string lpGuid    = "9719A466-2240-4DEA-9722-9FE0746A30A6";
            var          lpDto     = CreatoDTO(dtos, lpGuid, "LangProject", null);
            const string lexDbGuid = "6C84F84A-5B99-4CF5-A7D5-A308DDC604E0";
            var          ldbDto    = CreatoDTO(dtos, lexDbGuid, "LexDb", lpGuid);
            IDomainObjectDTORepository dtoRepos = new DomainObjectDtoRepository(1, dtos, m_mdc, null, TestDirectoryFinder.LcmDirectories);

            Assert.IsNull(dtoRepos.GetOwningDTO(lpDto), "LP has owner?");
            var ldbOwner = dtoRepos.GetOwningDTO(ldbDto);

            Assert.IsNotNull(ldbOwner, "LexDB has no owner?");
            Assert.AreSame(lpDto, ldbOwner, "LP not owner of LexDB?");
        }