testing Software Testing Techniques - Boundary Value Analysis Progressive discount
Example
The rule
Another common case we usually find and where it is useful to apply this technique are progressive rates based on values.
An e-commerce has an offer that is like:
- 10% off for orders above US$ 80.00
- 15% off for orders above US$ 150.00
- 25% off for orders above US$ 200.00
How to apply the technique
Rule of thumb: we always will pick the two sides of each boundary. For this case we will need to test with orders with the following values:
- US$ 79.99 (no discount)
- US$ 80.00 (10% off)
- US$ 149.99 (10% off)
- US$ 150.00 (15% off)
- US$ 199.99 (15% off)
- US$ 200.00 (25% off)
This is enough to cover all intervals with a great confidence level.
