public async Task ReturnGroupsListViewModel()
        {
            var handler = new GetAllGroupsQueryHandler(Context);

            var result = await handler.Handle(new GetAllGroupsQuery(), CancellationToken.None);

            Assert.IsInstanceOf(typeof(GroupsListViewModel), result);
        }
        public async Task ReturnCorrectGroupsAmount()
        {
            var handler = new GetAllGroupsQueryHandler(Context);

            var result = await handler.Handle(new GetAllGroupsQuery(), CancellationToken.None);

            Assert.AreEqual(result.Groups.Count, 2);
        }