public async Task CanCreateAssignments() { _assignmentRepositoryMock.Setup(x => x.InsertAssignment(It.Is <Assignment>(y => y.UserId == 2 && y.PlanId == 1))).Verifiable(); await _assignmentService.CreateAssignments(1, new List <int>() { 2 }, DateTime.Now); _assignmentRepositoryMock.Verify(); }