public void TestConstrutorEmptySubscriptions()
        {
            var objectUnderTest =
                new TestTopicViewModelBase(_ownerMock.Object, _itemMock.Object, new List <Subscription>());

            Assert.AreEqual(_ownerMock.Object.DataSource, objectUnderTest.DataSource);
            Assert.AreEqual(_ownerMock.Object.Context, objectUnderTest.Context);
            Assert.AreEqual((object)_itemMock.Object, objectUnderTest.Item);
            Assert.AreEqual(((ICloudExplorerItemSource)objectUnderTest).Item, objectUnderTest.Item);
            objectUnderTest.AssetOwnerEquals(_ownerMock.Object);
            Assert.AreEqual(0, objectUnderTest.Children.Count);
        }