Mettl Test Design & Development 2 — Questions and Answers
Question 1: Which test design technique is most effective for identifying defects at the boundaries of input ranges?
- Equivalence Partitioning
- Boundary Value Analysis (Correct answer)
- Decision Table Testing
- State Transition Testing
Correct answer: Boundary Value Analysis
Boundary Value Analysis focuses on the edges of input ranges where defects are statistically most likely to occur.
Question 2: In a decision table, what does a 'don't care' condition (often marked as '-') signify?
- The condition must always be true
- The condition's value does not affect the outcome for that rule (Correct answer)
- The condition has not been analyzed yet
- The condition should be ignored during testing
Correct answer: The condition's value does not affect the outcome for that rule
A 'don't care' condition means the outcome is the same regardless of whether that condition is true or false.
Question 3: Which technique is most appropriate when testing a login system that locks an account after 3 failed attempts?
- Equivalence Partitioning
- Cause-Effect Graphing
- State Transition Testing (Correct answer)
- Boundary Value Analysis
Correct answer: State Transition Testing
State Transition Testing models systems that change behavior based on history or state, like account lockout scenarios.
Question 4: What is the primary purpose of a traceability matrix in test design?
- Track the number of bugs found per tester
- Link test cases to their corresponding requirements (Correct answer)
- Schedule test execution order
- Measure test coverage by line of code
Correct answer: Link test cases to their corresponding requirements
A traceability matrix maps each requirement to test cases, ensuring all requirements are covered and changes are tracked.
Question 5: A software module has 5 conditions, each independently true or false. How many rows would a full decision table have?
- 10
- 25
- 32 (Correct answer)
- 64
Correct answer: 32
With 5 binary conditions, the full decision table has 2^5 = 32 possible combinations of inputs.
Question 6: Which of the following best describes the 'use case testing' technique?
- Tests individual functions in isolation
- Validates system behavior through actor-system interaction scenarios (Correct answer)
- Checks code paths by analyzing source code structure
- Tests boundary values across all input partitions
Correct answer: Validates system behavior through actor-system interaction scenarios
Use case testing derives test cases from use cases that describe how actors interact with the system to achieve goals.
Question 7: When applying Equivalence Partitioning to a field that accepts ages 18–65, which set of test values provides the best partition coverage?
- 17, 18, 65, 66
- 10, 30, 50, 70
- 18, 41, 65
- 17, 41, 66 (Correct answer)
Correct answer: 17, 41, 66
Testing one invalid value below (17), one valid middle value (41), and one invalid value above (66) covers all three equivalence partitions.
Mettl Test Design & Development 2
Which test design technique is most effective for identifying defects at the boundaries of input ranges?