Black Box – Worst Case BVT in software testing

Black Box – Worst Case BVT in software testing

In Worst case boundary value testing,  we make all combinations of each value of one variable with each value of another variable.

Worst Boundary value testing on 2 variables.

Suppose we have two variables x1 and x2 to test.

The range of x1: 10 to 90

The range of x2: 20 to 70

               X1  X2
Min 10 20
Min+ 11 21
Nominal 50 45
Max- 89 69
Max 90 70

Figure: Testing points detected in Worst Case Boundary Value Testing.

Test cases:

 

Total test cases = A*A

25 = 5*5

A= Number of testing points.

These testing points are min, min+, nominal, max- and max.

We can generate 25 test cases from both variables x1 and x2 by making a combination of each value of one variable with each value of another variable.

Test Case# X1,X2 Test Case # X1,X2 Test Case # X1,X2
1 10,20 2 10,21 3 10,45
4 10,69 5 10,70 6 11,20
7 11,21 8 11,45 9 11,69
10 11,70 11 50,20 12 50,21
13 50,45 14 50,69 15 50,70
16 89,20 17 89,21 18 89,45
19 89,69 20 89,70 21 90,20
22 90,21 23 90,45 24 90,69
25 90,70  

Figure: Test cases generated in Worst Case Boundary Value Testing

These 25 test cases are enough test cases to test the input values for these variables.