public void Should_return_valid_Root_Node_calling_Initializehierarchy()
        {
            // arrange
            var rootNodeTarget = new TestTarget
            {
                Id = 0,
                Data = new TestTargetData
                {
                    TestString = "Profile Root"
                }
            };
            var mockHierarchyDataProvider = new Mock<IHierarchyDataProvider>();
            mockHierarchyDataProvider.Setup(p => p.Add(It.IsAny<HierarchyEntry>(), It.IsAny<HierarchyNode>()));
            var mockHierarchyEntryRepository = new Mock<IHierarchyEntryRepository>();
            var mockTargetEntryRepository = new Mock<ITargetEntryRepository>();
            var mockTargetRepository = new Mock<ITargetRepository>();
            var mockTargetTypes = new List<Type>();

            var service = new HierarchyService(mockHierarchyDataProvider.Object, mockHierarchyEntryRepository.Object, mockTargetEntryRepository.Object, mockTargetRepository.Object, mockTargetTypes);

            // act
            var rootHierarchyNode = service.InitializeHierarchy(hierarchyEntry, rootNodeTarget);

            // assert
            Assert.That(rootHierarchyNode, Is.Not.Null);
            Assert.That(rootHierarchyNode.LeftId, Is.EqualTo(1));
            Assert.That(rootHierarchyNode.RightId, Is.EqualTo(2));
            Assert.That(rootHierarchyNode.Id, Is.EqualTo(0));

            mockHierarchyDataProvider
                .Verify(p => p.Add(It.IsAny<HierarchyEntry>(), It.IsAny<HierarchyNode>()));
        }