Subject Computer Science Software Engineering and Design

Question

The WonderCard, Ultd. credit card operations division has revised the criteria for granting credit limit increases to customers. The new business rules are described below. The software has not yet been developed.
The new program will read as input three data items for a customer and determine a new credit limit. The input items are the number of years as a customer, average monthly credit usage, and a credit score ( P = poor, G = good, E = excellent).
If a customer has a credit score of P no credit increase will be granted under any circumstances. Also, no credit increase will be granted to a customer who has been with WonderCard for five years or less and has a credit usage of $0 - $1,000 and a credit score of G.
A five percent increase will be given to customers who have been with WonderCard for more than five years if they have a G credit score and usage of $0 - $1,000; if they have been a customer for more than two years but not more than five years and have a credit score of G and usage greater than $1,000, or have been a customer for up to two years and have a credit score of E and usage not exceeding $1,000, or a credit score of G or E and usage greater than $1,000.
A ten percent increase will be given to customers who have been with WonderCard for more than five years and have a credit score of G and usage in excess of $1,000, or a credit score of E and usage not exceeding $1,000; or if they have been a customer for more than two years but not more than 5 years and have a credit score of E and usage in excess of $1,000.
A fifteen percent increase will be granted to only to those who have been customers for more than five years and have a credit score of E and a usage in excess of $1,000. Determine the number and types of test cases you would use to test this functional requirement, and be able to justify your results.

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In this case, there would be use of combinational test cases since more than one requirement is being tested (Jorgensen, 2013). Here there are four types of output that can be given – no increase, 5% increase, 10% increase and 15% increase. There are 3 inputs that would be provided to determine these 4 outcomes. As such, the total test cases should be 12 (4 * 3) so that all the combinations of the inputs and the resulting output can be fed into the system. Since the inputs can be a range, list or rank, they would have to be dealt differently....

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