Good Practices of MBT Test Selection CT-MBT Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   Which data coverage technique involves testing values at the edges of an input domain, such as minimum, maximum, and just inside/outside boundaries?

   • AState transition testing
   • BBoundary value analysis
   • CDecision table testing
   • DEquivalence partitioning
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   How do traceability links between model elements and requirements help in test selection?

   • AThey determine the execution order of test cases
   • BThey allow testers to identify which model elements correspond to which requirements, so tests can be selected to cover specific requirements
   • CThey replace the need for structural coverage criteria
   • DThey automatically generate test data for the selected test cases
   Reveal Solution Discussion Select an answer first
4. 23expert · hard

   A team is testing a model for a medical device's drug delivery system. The model has two main features: 'administer insulin' and 'display battery status'. The 'administer insulin' feature has a very high impact if it fails (patient harm) and a medium likelihood of failure. The 'display battery status' feature has a low impact and a high likelihood of failure. The team has a very limited test budget and must choose which feature to test more thoroughly. They also have traceability links showing that 'administer insulin' is linked to critical safety requirements, while 'display battery status' is linked to non-critical requirements. Which approach best balances risk and requirement criticality?

   • ATest both features equally to ensure balanced coverage
   • BPrioritize testing for 'administer insulin' because it has higher impact and is linked to critical safety requirements
   • CUse traceability links to select tests only for requirements with the most links
   • DPrioritize testing for 'display battery status' because it has a higher likelihood of failure
   Reveal Solution Discussion Select an answer first
5. 24expert · hard

   A team has used an MBT tool to generate a reduced test suite that achieves 100% branch coverage. They want to evaluate whether this suite is effective enough for a safety-critical system. They have a set of mutants and run the suite against them, achieving a mutation score of 85%. The team is considering whether to add more test cases to improve the score. What is the most important consideration when interpreting this mutation score?

   • AThe time it took to generate the test suite
   • BWhether the remaining 15% of mutants represent realistic and important faults for the system
   • CThe total number of test cases in the suite
   • DThe size of the model
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A team is testing a model for a library management system. They have two goals: (1) ensure every decision in the model is exercised, and (2) ensure every user story is covered by at least one test. Which combination of selection criteria should the team use?

   • AStatement coverage and boundary value analysis
   • BPath coverage and equivalence partitioning
   • CBranch coverage and requirement-based selection
   • DCondition coverage and risk-based selection
   Reveal Solution Discussion Select an answer first