Question

Identifying Test cases using Boundary value analysis and Equivalence partitioning

Objective: To identify and document test cases for a given functionality, using Boundary value Analysis and Equivalence partitioning technique.

Q1. Problem Description: Consider the function below whosefunctionality is described in its documentation.

/******************************************************************

* Method: computeInterestRate

* Description: Given the term of the deposit, computes and returns

* the interest rate. Both the parameters iNumberOfYears and

* iNumberOfMonths together form the term

*

* Criteria for Interest:

* Less than 3 months 1%

* 3 months to 5 months 3.5%

* 6 months to 11 months 4.5%

* 1 year to 1 year, 11 months 5.0%

* 2 years and above 5.5%

* PARAMETERS:

* int iNumberOfYears  Number of years

* int iNumberOfMonths  Number of months (if less than year).

* Can have values 1-11 only

*

* RETURNS: Appropriate Rate of Interest. -1.0 in case of error.

******************************************************************/

float computeInterestRate (int iNumberOfYears, intiNumberOfMonths) {

​...

​...

}

Programming Language is Java

Answer 1

Complete java program:

public class InterestRateFinder {

   public static void main(String[] args) {
      
       //Creating the object of the class and calling the method
       InterestRateFinder object = new InterestRateFinder();
       System.out.println(object.computeInterestRate(2, 19));
   }

   //method implementation
   float computeInterestRate(int iNumberOfYears, int iNumberOfMonths) {

       /*if number of months less than 1 and number of years less than or equal to 0
       if number of months >11 and number of years less than or equal to 0*/
       if( iNumberOfYears <= 0 && (iNumberOfMonths< 1 || iNumberOfMonths > 11))
           return -1;
       else if(iNumberOfMonths < 1 || iNumberOfMonths > 11) {
           return -1;
       }
       else {
           //calculate the term
           int term = iNumberOfYears * 12 + iNumberOfMonths;
          
           //conditions
           if(term < 3) {
               return (float)1/100;
           }else if(term >=3 && term <=5) {
               return (float)3.5/100;
           }else if(term>=6 && term<=11) {
               return (float)4.5/100;
           }else if(term>=12 && term<=23) {
               return (float)5/100;
           }else if(term>=24) {
               return (float)5.5/100;
           }
       }
       return -1;
   }
}