Mettl Test Design & Development 4

Question 1

In test design, what is a 'test oracle'?

Accepted Answer

A mechanism or source of information used to determine whether the actual outcome is correct

Answer

A test oracle provides the expected results against which actual system outputs are compared to determine pass or fail.

Question 2

Which approach is most suitable for designing tests for a system with complex business rules involving multiple conditions and actions?

Accepted Answer

Decision Table Testing

Answer

Decision Table Testing systematically handles complex logical combinations of conditions and their resulting actions, ensuring all rule combinations are considered.

Question 3

What does 'test independence' mean in the context of test design?

Accepted Answer

Tests do not rely on the outcome or state of other tests, ensuring reliable and repeatable results

Answer

Test independence ensures that test results are not influenced by execution order or the state left by other tests, making failures easier to isolate.

Question 4

What is 'defect clustering' and how should it influence test design?

Accepted Answer

The observation that most defects are concentrated in a few modules, so test effort should be focused there

Answer

Defect clustering (Pareto Principle) shows ~80% of defects come from ~20% of modules, guiding testers to apply deeper testing in high-risk areas.

Question 5

When designing tests for an API endpoint, which input category is MOST important to cover beyond happy path tests?

Accepted Answer

Invalid data types, missing required fields, and out-of-range values

Answer

API testing must validate how the endpoint handles malformed, missing, and boundary-violating inputs to ensure robustness and security.

Mettl Practice Test

Mettl Practice Test

Mettl Test Design & Development 4