public void AddGroup()
{
var res = controller.AddGroup(3, 2);
Assert.IsInstanceOfType(res, typeof(RedirectToRouteResult));
var redirectRes = res as RedirectToRouteResult;
Assert.AreEqual("Assign", redirectRes.RouteValues["action"]);
Assert.AreEqual(3, redirectRes.RouteValues["id"]);
mockRepository.Verify(r => r.Update(tests[2]));
mockRepository.Verify(r => r.Save());
var collection = tests[2].Groups as ICollection;
CollectionAssert.Contains(collection, groups[1]);
}