# 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.

Fazal Rehman Shamil
Welcome to all friends. The reason for our success is only your love for T4Tutorials. Our team is always available to answer your queries regarding any kind of confusions or discussion regarding your study and career matters. For discussion with us please join our facebook group "T4Tutorials.com". The link of the group is mentioned below. Thanks and love to all for connecting with us. We are nothing without you. Love you all.....