public void GroupsDelete()
{
Mock <Storage> storage = new Mock <Storage>();
storage.Setup(o => o.GetGroups()).Returns(groups);
Groups gr = groups.First();
storage.Setup(o => o.DeleteGroup(gr)).Callback(() => groups.Remove(gr));
groupsController.Storage = storage.Object;
ActionResult result = (groupsController.FilterGroups(new GroupsList {
CurrentGroup = gr
}, "Delete"));
Assert.AreEqual(4, groups.Count);
}