Why is it important to be able to partition the test space into equivalence clas

Question

Why is it important to be able to partition the test space into equivalence classes? For the following code fragment, describe 3 different test cases, and for each, describe the class of test cases it represents. Note: The below code might or might not have any issue(s).

public String printTriangleType (int x, y, z)

{

   /* requires: The parameters are in ascending order (i.e. x <= y <= z)

        effects: If x, y and z are the lengths of the sides of a triangle,

        this function classifies the triangle using one of the three strings,

      "scalene", "isosceles" or "equilateral". If x, y, and z do not form a

        triangle, the empty string is returned. */

     String r;

     r="scalene";

     if (x == y || y == z) {   r="equilateral";   return r;   }

     if (x == z) { r="isosceles"; return r; }

     if (x <= 0 || (x+y) <= z) { r=""; return r; }

     return (r);

Explanation / Answer

Equivalence class test are needed to test function with all possibilities.

For this given the following are the equivalence test

For all the cases x,y,z represent the sides of the triangle.And Where blank is written it means triangle cannot be formed.

1) Weak Normal Equivalence Class

Test Case ID x y z Expected Output

WNE1 10 10 10 equilateral

WNE2 10 10 3 isocelec

WNE3 10 20 30 scalene

WNE4 40 10 20 blank

2) Weak Robust Equivalence Class

Test Case ID x y z Expected Output

WRE1 10 50 50 x value is wrong

WRE2 50 -10 50 y value is wrong

WRE3 50 50 -10 z value is wrong

WRE4 400 10 20 x value is out of range

4) Strong Robust Equivalence Class

Test Case ID x y z Expected Output

SRE1 -10 50 50 x value is wrong

WRE2 50 -10 50 y value is wrong

WRE3 50 50 -10 z value is wrong

WRE4 -10 -10 60 x and y value is out of range

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.