Design test cases and test the program of Quadratic Equation problem using Robustness testing

Sandeep Verma — Sat, 19 Sep 2020 12:49:06 +0000

An equation is said to be a quadratic equation if only if it is in the form of ax²+bx+c where a can’t be 0. We will use the Quadratic formula for calculating the roots to check whether they are imaginary or real.

This Quadratic formula is used only when b²– 4ac >= 0. such that, If b²– 4ac > 0 , means the equation has more than one real roots if b²– 4ac = 0 , means equal or single root if b²– 4ac <0, i3mplies imaginary root Lastly, if a is 0, then the equation would not be counted as a quadratic equation.

So, a quadratic equation can have [ Real, Equal, Imaginary, not quadratic ]

Program

Check out “Quadratic Equation” program along with its tested test cases.

Robustness Testing

We are assuming interval [0,10] where our input values will come in between and we will create test cases using Robustness testing accordingly.

In Robustness Testing, it will produce 6N+1 test cases which means, in this case, there will be 6*3+1 = 19 test cases.

Test ID	a	b	c	Expected Output	Program Output	Tested Outcome
1	-1	5	5	Invalid Input	Invalid Input	Pass
2	0	5	5	Not Quadratic	Not Quadratic	Pass
3	1	5	5	Real	Real	Pass
4	9	5	5	Imaginary	Imaginary	Pass
5	10	5	5	Imaginary	Imaginary	Pass
6	11	5	5	Invalid Input	Invalid Input	Pass
7	5	-1	5	Invalid Input	Invalid Input	Pass
8	5	0	5	Imaginary	Imaginary	Pass
9	5	1	5	Imaginary	Imaginary	Pass
10	5	9	5	Imaginary	Imaginary	Pass
11	5	10	5	Equal	Equal	Pass
12	5	11	5	Invalid Input	Invalid Input	Pass
13	5	5	-1	Invalid Input	Invalid Input	Pass
14	5	5	0	Real	Real	Pass
15	5	5	1	Real	Real	Pass
16	5	5	9	Imaginary	Imaginary	Pass
17	5	5	10	Imaginary	Imaginary	Pass
18	5	5	11	Invalid Input	Invalid Input	Pass
19	5	5	5	Imaginary	Imaginary	Pass

How it is different from Boundary Value Analysis?

We can observe that previously we didn’t check for input values higher than the maximum boundary limit and lesser than the minimum boundary limit. In other words, we haven’t tested our code for Invalid Inputs in Boundary Value Analysis but in Robustness testing, we did make test cases for invalid inputs too and rewrite the code to fulfill this condition.

Robustness testing example – Programmerbay

Design test cases and test the program of Quadratic Equation problem using Robustness testing

Program

Robustness Testing