public void OnWorkspaceSavingIsCalledWhenWorkspaceIsSaving()
{
// Act
model.OnWorkspaceSaving(model.CurrentWorkspace, Graph.SaveContext.Save);
// Assert
storageExt.Verify(x => x.OnWorkspaceSaving(It.IsAny <Dictionary <string, string> >(), It.IsAny <Graph.SaveContext>()), Times.Once());
}