public void NonExistingUserContainsUsersForSubchannelTest()
        {
            ITvCardContext ctx = new TvCardContext();

            IUser u1 = new User("u1", false, 1);

            u1.SubChannel = 2;
            ctx.Add(u1);

            Assert.IsFalse(ctx.ContainsUsersForSubchannel(1), "user with subchannel found");
        }