Total discount is a simple summation of individual discounts:

Guitar Type	Basic Acoustic	2%
	Basic Acoustic with Kit	3%
	World-class Acoustic with Kit	4%
Quantity	1-20 guitars	5%
	More than 20 guitars	10%
Shipping	Domestic	5%
	Overseas	3%
Payment mode	Credit Card	0%
	Cash on receipt	4%

Here is how Sahi can be used to test it:

Create a single test case by choosing various options for the guitar.
For example, this could be the sample script which was recorded.

_setSelected(_select("typeofguitar"), "Basic Acoustic with Kit - Each Unit Rs. 4500");
_setValue(_textbox("qty"), "12");
_click(_radio("shipto[1]"));
_click(_radio("pay[1]"));
_click(_button("Click for discount >"));
_assertContainsText("15", _span("discount"));

We modify the script and replace the identification of various elements with their ids, for better readability. (This will be the default recording from the next version of Sahi)

_setSelected(_select("typeofguitar"), "BasicWithKit");
_setValue(_textbox("qty"), "12");
_click(_radio("Overseas"));
_click(_radio("CreditCard"));
_click(_button("Click for discount >"));
_assertContainsText("15", _span("discount"));

Create a function out of this and invoke it.

function checkDiscount($guitarType, $quantity, $destination, $paymentMode, $expectedDiscount){
	_setSelected(_select("typeofguitar"), $guitarType);
	_setValue(_textbox("qty"), $quantity);
	_click(_radio($destination));
	_click(_radio($paymentMode));
	_click(_button("Click for discount >"));
	_assertContainsText($expectedDiscount, _span("discount"));
}
checkDiscount("BasicWithKit", "12", "Overseas", "CreditCard", "15");

Now we need to create the different cases and the desired output for this.

• A deep look at the above fields presents us with a Test Input Model.
• There are 3 types of guitars, 2 equivalence classes for quantity, 2 locations for shipping, and 2 modes of payment. This implies that there are totally 3 * 2 * 2 * 2 = 24 combinations of test inputs.
• Preparing a traditional horizontal decision table will not help automate the 24 tests and we need a vertical chart (a data table) that the Sahi can process.
• Also important to note is the fact that none of these 24 combinations can be omitted from testing, as each input combination has significantly different behavior from the calculations perspective.

There is a simple way to create this data. We use TestersDesk.com (a free online toolkit for the testing community that provides test design and test data tools) and provide the below input model to the N-way TestCase Generator (all-combinations).

TypeOfGuitar:Basic,BasicWithKit,Advanced
Qty:12,24
Location:Domestic,Overseas
PaymentMode:CashOnReceipt,CreditCard

Note that the format is ParameterName:Value1,Value2,Value3 etc in each line. The generated file may usually open in MS Excel but try and open it in a normal text editor and copy what is needed. This will produce the below output, to which you can add one more column called expected result and enter the needed values.

Basic,12,Domestic,CashOnReceipt
Basic,12,Domestic,CreditCard
Basic,12,Overseas,CashOnReceipt
Basic,12,Overseas,CreditCard
Basic,24,Domestic,CashOnReceipt
Basic,24,Domestic,CreditCard
Basic,24,Overseas,CashOnReceipt
Basic,24,Overseas,CreditCard
BasicWithKit,12,Domestic,CashOnReceipt
BasicWithKit,12,Domestic,CreditCard
BasicWithKit,12,Overseas,CashOnReceipt
BasicWithKit,12,Overseas,CreditCard
BasicWithKit,24,Domestic,CashOnReceipt
BasicWithKit,24,Domestic,CreditCard
BasicWithKit,24,Overseas,CashOnReceipt
BasicWithKit,24,Overseas,CreditCard
Advanced,12,Domestic,CashOnReceipt
Advanced,12,Domestic,CreditCard
Advanced,12,Overseas,CashOnReceipt
Advanced,12,Overseas,CreditCard
Advanced,24,Domestic,CashOnReceipt
Advanced,24,Domestic,CreditCard
Advanced,24,Overseas,CashOnReceipt
Advanced,24,Overseas,CreditCard

Now, adding one more column with the expected result will have the 24 tests ready. So we compute the values based on the rules above and come up with this

Basic,12,Domestic,CashOnReceipt,16
Basic,12,Domestic,CreditCard,12
Basic,12,Overseas,CashOnReceipt,14
Basic,12,Overseas,CreditCard,10
Basic,24,Domestic,CashOnReceipt,21
Basic,24,Domestic,CreditCard,17
Basic,24,Overseas,CashOnReceipt,19
Basic,24,Overseas,CreditCard,15
BasicWithKit,12,Domestic,CashOnReceipt,17
BasicWithKit,12,Domestic,CreditCard,13
BasicWithKit,12,Overseas,CashOnReceipt,15
BasicWithKit,12,Overseas,CreditCard,11
BasicWithKit,24,Domestic,CashOnReceipt,22
BasicWithKit,24,Domestic,CreditCard,18
BasicWithKit,24,Overseas,CashOnReceipt,20
BasicWithKit,24,Overseas,CreditCard,16
Advanced,12,Domestic,CashOnReceipt,18
Advanced,12,Domestic,CreditCard,14
Advanced,12,Overseas,CashOnReceipt,16
Advanced,12,Overseas,CreditCard,12
Advanced,24,Domestic,CashOnReceipt,23
Advanced,24,Domestic,CreditCard,19
Advanced,24,Overseas,CashOnReceipt,21
Advanced,24,Overseas,CreditCard,17

• We have essentially created a vertical decision table that can test all possible combinations using the N-way TestCase Generator at TestersDesk.com.

Once the test case data has been created, we store it in a csv file, say, values.csv

We now read the csv file using _readCSVFile and iterate over the data using a for loop.

var $data = _readCSVFile("../scripts/td/values.csv"); // the file is kept in the scripts/td folder
for (var $i=0; $i<$data.length; $i++){
	var $row = $data[$i];
	checkDiscount($row[0], $row[1], $row[2], $row[3], $row[4]);
}

The full script now becomes:

function checkDiscount($guitarType, $quantity, $destination, $paymentMode, $expectedDiscount){
	_setSelected(_select("typeofguitar"), $guitarType);
	_setValue(_textbox("qty"), $quantity);
	_click(_radio($destination));
	_click(_radio($paymentMode));
	_click(_button("Click for discount >"));
	_assertContainsText($expectedDiscount, _span("discount"));
}

var $data = _readCSVFile("../scripts/td/values.csv");
for (var $i=0; $i<$data.length; $i++){
	var $row = $data[$i];
	checkDiscount($row[0], $row[1], $row[2], $row[3], $row[4]);
}

There is a small problem in this script. If there is a problem in the execution of any particular row of data, the script will fail and not proceed to the next row.
We fix this by using a try catch block and come up with this final script.

function checkDiscount($guitarType, $quantity, $destination, $paymentMode, $expectedDiscount){
    try{
        _setSelected(_select("typeofguitar"), $guitarType);
        _setValue(_textbox("qty"), $quantity);
        _click(_radio($destination));
        _click(_radio($paymentMode));
        _click(_button("Click for discount >"));
        _assertContainsText($expectedDiscount, _span("discount"));
    }catch(e){
        // The try catch block helps in continuing with the next step of data inspite of failures.
        // _logException will log the exception so that the logs will indicate the failing line.
        _logException(e);
    }
}

var $data = _readCSVFile("../scripts/td/values.csv");
for (var $i=0; $i<$data.length; $i++){
	var $row = $data[$i];
	checkDiscount($row[0], $row[1], $row[2], $row[3], $row[4]);
}