QA · Mid-level · Theory

An online store's discount depends on the customer's status, the order total and whether there's a promo code, and the rules overlap in places. How would you design tests for this logic?

~4 min by voice

How to approach it

This checks whether the candidate knows the decision table as a test design technique for combinations of conditions and can use it to find gaps and contradictions in the requirements, not just to write tests.

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test design decision tables

Similar questions

Tell me when you use pairwise testing, and in which cases it can miss a serious defect. Senior You're given a business rule for calculating a discount that depends on the order total, the customer's status and a promo code. How would you design tests for it? Senior In an online store, the discount depends on three conditions: whether the customer has a loyalty card, whether the order total is over $100, and whether this is their first order. How would you design the tests so that you don't miss a single combination? Junior There's a function is_valid_password: it takes a string and returns true or false. A password is valid if it has 8 to 20 characters, at least one digit, and at least one uppercase Latin letter. You don't have the function's code; write a set of automated tests for it. Junior A checkout form has four payment methods, three delivery methods, five regions, and a "have a promo code" checkbox. Testing every combination exhaustively takes too long. How would you reduce the test set, and what are you risking by doing that? Mid-level

Answer by voice

The interviewer will ask this question and listen. Think out loud and ask for a hint if you need one. When you're done, pause or tap “That's my answer”. In about a minute, your score and the points you covered show up here.

Best with headphones · ~4 min