public async Task AssertThatGetUserIncomesPerYearCallsFindBetsByUseAndReturnsNotEmptyList() { _betDao.FindBetsByUser(Arg.Any <User>(), Arg.Any <int>()).Returns(Task.FromResult(_betsByUser)); var getUserIncomesPerYear = await _betManager.GetUserIncomesPerYear(_user); await _betDao.Received().FindBetsByUser(Arg.Any <User>(), Arg.Any <int>()); Assert.IsNotEmpty(getUserIncomesPerYear); }