public void Load_WithAvailableSources_DoesntSaveThoseSources() { Source rootFolder = new Source { IsRoot = true, SourceType = SourceType.Music, Folder = @"C:\Folder" }; Source specificFolder = new Source { IsRoot = false, SourceType = SourceType.Music, Folder = @"C:\Folder\Music" }; IEnumerable <Source> sources = new List <Source> { rootFolder, specificFolder }; _sourceService.GetSources(SourceType.Music) .Returns(sources); // Act _viewModel.Load(); // Assert _sourceService.DidNotReceiveWithAnyArgs() .Add(null); }