Free CT-MBT sample questions

Correct answer: All-Transitions Coverage

All-Transitions Coverage ensures that every transition in the state model is traversed at least once by the generated test cases. This is a stronger criterion than All-States, which only requires visiting every state.

Correct answer: Formalizing system requirements into a state transition diagram.

Formalizing requirements into a model (like a state transition diagram) is the core activity of the MBT Modeling phase. The other options relate to implementation (adaptation layer) or execution.

Correct answer: BPMN (Business Process Model and Notation)

BPMN is specifically designed for workflow modeling, emphasizing the sequence of activities, gateways (decisions), and flow of business processes. Statecharts focus on the object/system lifecycle states, which is less suitable for a process flow.

Correct answer: To provide a high-level description of the test path derived from the model, independent of the SUT's implementation details.

An abstract test case is a path through the model (sequence of inputs/expected outputs) expressed in the model's terminology. It lacks the low-level details (like specific button IDs or API endpoints) needed for execution, making it implementation-independent.

Correct answers: Underestimating the initial learning curve and effort required to build the first models.; Attempting to model the entire system in detail immediately rather than starting with a focused pilot.

A major pitfall is expecting immediate ROI. Building the initial models and adaptation layer requires significant upfront effort and new skills, often leading to disappointment if expectations aren't managed.

Trying to 'boil the ocean' by modeling everything at once usually leads to complexity overload and failure. Successful deployments typically start with a small, manageable pilot.

Correct answer: N-Switch Coverage (where N > 0)

N-Switch coverage requires traversing sequences of N+1 transitions. Even a 1-Switch coverage (pairs of transitions) is stronger than All-Transitions (which is essentially 0-Switch). It detects defects related to history/sequence, not just single steps.

Correct answer: Test Adapter

The Test Adapter is the specific component responsible for translating abstract commands (e.g., 'Login') into concrete SUT actions (e.g., 'POST /api/login with user=X').

Correct answer: submit -> approve -> publish

According to the diagram, the flow is Draft --(submit)--> Review --(approve)--> Approved --(publish)--> Published. This matches the sequence 'submit -> approve -> publish'.

Correct answer: Decision Table

Decision Tables are ideal for capturing complex business rules based on combinations of conditions (Tier, Value, Coupon) and determining the resulting action (Discount %). They handle combinatorial logic much better than state diagrams or flowcharts.

Correct answer: To reduce the number of test cases while ensuring all pairs of parameter values are tested together at least once.

Pairwise testing is a combinatorial reduction technique. It assumes most defects are caused by single parameters or the interaction of two parameters. It significantly reduces test volume compared to All Combinations (3*3*2 = 18) while maintaining high defect detection capability.