OpenEuphoria

Re: Success Story

• Posted by Derek Parnell <ddparnell at bigpond.com> Jun 09, 2007
• 582 views

Ricardo Forno wrote:
> 
> Hi Derek!
> Congratulations to you, to all Euphorians and, of course, to Rob!
> Just a small question: what do you exactly mean by a "modelling language"
> in a case such as the present one, I mean, excel, mortgages, banking, etc.?

The modelling language is used to simulate real-world scenarios. In this case it
is used to simulate the various activities that can occur to a mortgage loan over
its lifetime - such as changes in interest rates, in amount borrowed, terms,
repayment frequencies, missed payments, over payments, bounced cheques, bank
charges, etc...

Each of these things effect the loan and account data and the modelling language
enables the tester to simulate these effects without having to run the real
application in real time. The purpose is to use it to see if the application is
doing things according to the requirements specification.

Excel is often used to model complex interactions but there comes a point in
which one bumps into its limitations.

I was pleasantly surprised at how easy it was to write and how quickly it could
be done. I guessed beforehand that Euphoria would make the task possible to be
done in the time frame I had, but it really just flowed so naturally.

Also, I must give credit to Carl White's datetime.e library. 


Here is a sample of a testcase file:

****************
using iomodel
title "Interest Only with Monthly repayments, Account Keeping Fee applies"

Set Date:   2007/09/30
Settlement: $200,000.00             * Settlement
Draw down:  $-200,000.00            * Drawdown

Set Date:   2007/10/31
Interest:   $-1,227.40 id=1         * Interest posted
Fee:        $-300.00  id=2          * Account keeping fee

Set Date:   2007/11/01
Uncleared CR:  $1227.40 id=1        * Collect interest payment from Nom.Acct
End Cycle:                          * End of Repayment period
Uncleared CR:  $300.00 id=2         * Collect fee payment from Nom.Acct
Payment Due:   id=1                 * Interest due
Payment Due:   id=2                 * Fee due

Set Date:   2007/11/09
Clearing:   id=1                    * Clear Interest Payment
Clearing:   id=2                    * Clear AKF Payment

Set Date:   2007/11/30
Interest:   $-1,150.68 id=3         * Interest posted

Set Date:   2007/12/03
Cleared CR: $100.00                 * Cash deposit
EndCycle:                           * End of Repayment period
Payment Due: id=3                   * Interest due

Set Date:   2007/12/04
Withdrawal: $-200.00                * Cash withdrawal
**********************************

This is run using the model described in 'iomodel', which is a collection of
macro/script type blocks of code that reflect what happens to the various fields
in a loan account as the events are triggered.

At the end of the test run, a .CSV file is created suitable for loading into
Excel to see the effects of the test.

-- 
Derek Parnell
Melbourne, Australia
Skype name: derek.j.parnell