public void TestBackgroundMouseDown_NodeInVisibleNodeList_VisibleNodeListCleared() { _nodeSelectorViewModel.VisibleNodesList.Add(_nodeMoq1.Object); Assert.AreEqual(1, _nodeSelectorViewModel.VisibleNodesList.Count); _nodeSelectorViewModel.BackgroundMouseDown(); Assert.IsTrue(_nodeSelectorViewModel.VisibleNodesList.IsNullOrEmpty()); }