public async Task GroupByEmployeeIdentifierGetHighCountInOrders() { List <Employees> employeeList = await OrderOperations.GetEmployeesTask(); IGrouping <int, Employees> employee = OrderOperations.EmployeeMostOrders(employeeList); // https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/default-values Assert.IsTrue(employee != default); Debug.WriteLine($"Order count: {employee.Count()} employee id: {employee.Key}"); SqlOperations.Server = ".\\SQLEXPRESS"; SqlOperations.Database = "NorthWind2020"; // | | // V V <- Discards var(_, _, dictionary) = SqlOperations.EmployeeMostOrders(); Assert.AreEqual(employee.Count(), dictionary.FirstOrDefault().Value); }