public void TestMouseLeftSelector_LibraryExists_LibrariesUnselected() { _nodeSelectorViewModel.MousedOverNode = _nodeMoq1.Object; var libraryMoq1 = new Mock <NodePaletteLibrary>(""); _nodeSelectorViewModel.LibrariesList.Add(libraryMoq1.Object); _nodeSelectorViewModel.MouseLeftSelector(); libraryMoq1.Verify(l => l.Unselect()); }