A Software Engineering question, regarding Black-Box Testing Techniques:

Q:- A program computes its output variable T according to the following formula: [ x as in multiply]

1)T = X x 0.2 + Y x 0.4 + Z x 0.4 where X>= 50, Y>= 50 and Z >= 50

2)T= X x 0.2 + Y x 0.3 + Z x 0.5 where X,Y and Z are otherwise than X>= 50, Y>= 50 and Z >= 50 range.

The input variables of this program are X,Y and Z. All of them are positive values. Using the following Black-Box testing techniques to design a test that is suit to this program:

a) Equivalence Class Testing

1. A program computes its output variable Taccording to the following formula T- X 0.2 Y 0.4 Z 0.4 X 50 and Y 2 50 and Z 50 X 0.2 Y 0.3 Z 0.5 otherwise The input variables of this program are X, Y and Z. All of them are non-negative values.

Using the following black-box testing techniques to design a test suite each to test this program a) Equivalence class testing b) Boundary value testing c) Cause-effect testing