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Exam Code: CTFL v4.0

Exam Name Certified Tester Foundation Level (CTFL) v4.0

Certification Provider: ISTQB

Corresponding Certification: CTFL

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ISTQB CTFL v4.0 Practice Test 50

Question 490

A test analyst investigates the following quality concern: An insurance policy pays only if the customer is adult, coverage is active, and the claim is within the limit; the team tests only all-true and all-false combinations. Which observation best verifies that the stated testing issue is addressed?

  1. The test set exercises immediately below, on, and immediately above each boundary.
  2. Cases detect a defect that pays when coverage is inactive despite the other two conditions being true.
  3. Two cancellation scenarios lead to their respective documented payment outcomes.
  4. Three failures lock the account as agreed, while a permitted reset follows the authorized recovery path.

Explanation

Correct Answer

B:

This is the expected verification outcome: Cases detect a defect that pays when coverage is inactive despite the other two conditions being true. It directly checks the corrective activity (Build the feasible combinations of the three booleans and map each to an expected eligibility action.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: A booking API allows 1–6 passengers, and a developer asserts that 1, 3, 6, and 7 prove three-value boundary coverage. It does not establish the required result for this case: Cases detect a defect that pays when coverage is inactive despite the other two conditions being true.

C:

This result may validate another testing scenario: A travel claim uses conditions 'flight cancelled' and 'replacement provided', with compensation depending on their combination; the tester groups all cancellation cases into one partition. It does not establish the required result for this case: Cases detect a defect that pays when coverage is inactive despite the other two conditions being true.

D:

This result may validate another testing scenario: An ATM team specifies 'if PIN invalid then reject' but never specifies what happens after three consecutive failures, leaving an account-lockout security gap. It does not establish the required result for this case: Cases detect a defect that pays when coverage is inactive despite the other two conditions being true.

Question 491

A test analyst investigates the following quality concern: An insurance policy pays only if the customer is adult, coverage is active, and the claim is within the limit; the team tests only all-true and all-false combinations. Which testing concept or underlying cause best explains the reported problem?

  1. Combined conditions may have distinct outcomes hidden by all-true/all-false checks.
  2. Defects commonly occur near transition boundaries that middle-of-partition tests do not cover.
  3. A valid state value is not proof that every transition to it is permitted.
  4. Acceptance criteria define conditions for story acceptance and must be concrete and testable.

Explanation

Correct Answer

A:

The most relevant explanation is: Combined conditions may have distinct outcomes hidden by all-true/all-false checks. This describes why the original situation (An insurance policy pays only if the customer is adult, coverage is active, and the claim is within the limit; the team tests only all-true and all-false combinations.) merits the response: Build the feasible combinations of the three booleans and map each to an expected eligibility action.

Incorrect Answers

B:

This principle could explain a different testing issue: A delivery app supports parcel weight 0.1–30.0 kg, yet testing uses only many ordinary weights in the middle of the range. The present case is better explained by: Combined conditions may have distinct outcomes hidden by all-true/all-false checks.

C:

This principle could explain a different testing issue: An order fulfillment API has 12 valid statuses but the test suite sends each status value directly while never testing that Delivered cannot return to Packing. The present case is better explained by: Combined conditions may have distinct outcomes hidden by all-true/all-false checks.

D:

This principle could explain a different testing issue: An e-commerce story has one acceptance sentence, 'the discount works', and the tester cannot determine which customer segments qualify. The present case is better explained by: Combined conditions may have distinct outcomes hidden by all-true/all-false checks.

Question 492

A test analyst investigates the following quality concern: An insurance policy pays only if the customer is adult, coverage is active, and the claim is within the limit; the team tests only all-true and all-false combinations. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Derive invalid classes from all format rules rather than only typical valid values.
  2. Trace each decision-table rule to a test and confirm infeasible combinations are identified.
  3. Include lower and upper nearest invalid neighbors in length-validation test design.
  4. Require branch outcome inventories for high-risk modules.

Explanation

Correct Answer

B:

This safeguard specifically targets the contributing cause: Trace each decision-table rule to a test and confirm infeasible combinations are identified. It addresses the principle (Combined conditions may have distinct outcomes hidden by all-true/all-false checks.) and can be assessed by: Cases detect a defect that pays when coverage is inactive despite the other two conditions being true.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 4.2): A numeric invoice reference accepts exactly eight digits, but the team tests a few eight-digit values and does not challenge the format's alphabetic and length restrictions. The targeted safeguard for the current case is: Trace each decision-table rule to a test and confirm infeasible combinations are identified.

C:

This preventive step mitigates a different project risk (syllabus section 4.2): A customer service form accepts 5–50 characters, and a tester chooses exactly 5 and 50 but never checks rejection outside the range. The targeted safeguard for the current case is: Trace each decision-table rule to a test and confirm infeasible combinations are identified.

D:

This preventive step mitigates a different project risk (syllabus section 4.3): A rule engine has eight executable branch outcomes and tests traverse six, yet management calls this 100% because every function was invoked. The targeted safeguard for the current case is: Trace each decision-table rule to a test and confirm infeasible combinations are identified.

Question 493

In a fictional application-delivery project, the team reports: An account service transitions from Locked to Active after a successful verification event, but tests check only the current labels without sending events. Which testing activity or corrective action best addresses this situation?

  1. Include event sequences from each reachable state, including the invalid Rejected-to-Approved attempt.
  2. Exercise allowed and disallowed events from the relevant states and verify state changes.
  3. Exercise the lower and upper boundaries and their nearest relevant neighbors with the required precision.
  4. Add requirements-based duplicate-payment scenarios independently of structural coverage.

Explanation

Correct Answer

B:

The targeted action is: Exercise allowed and disallowed events from the relevant states and verify state changes. It addresses the underlying software-testing principle: State transition testing evaluates event-driven behavior and permitted transitions, not only static state values. The relevant confirming evidence is: A verification event unlocks as defined while an unauthorized event leaves the account locked.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 4.2, Black-Box Test Techniques): A fraud workflow has states Review, Approved, and Rejected, but testers verify all outbound transitions only from Review and never attempt approval after rejection. The present problem instead depends on: State transition testing evaluates event-driven behavior and permitted transitions, not only static state values.

C:

This choice is a useful response to a different testing situation (section 4.2, Black-Box Test Techniques): A delivery app supports parcel weight 0.1–30.0 kg, yet testing uses only many ordinary weights in the middle of the range. The present problem instead depends on: State transition testing evaluates event-driven behavior and permitted transitions, not only static state values.

D:

This choice is a useful response to a different testing situation (section 4.3, White-Box Test Techniques): A team has 100% branch coverage for its error-prone payment module but ignores a requirement for duplicate-charge prevention absent from all code. The present problem instead depends on: State transition testing evaluates event-driven behavior and permitted transitions, not only static state values.

Question 494

In a fictional application-delivery project, the team reports: An account service transitions from Locked to Active after a successful verification event, but tests check only the current labels without sending events. Which observation best verifies that the stated testing issue is addressed?

  1. Each integer boundary case is processed according to its documented acceptance range.
  2. Tests check values just below, at, and just above the supported weight limits.
  3. Repeated trials isolate an intermittent dependency delay with supporting logs.
  4. A verification event unlocks as defined while an unauthorized event leaves the account locked.

Explanation

Correct Answer

D:

This is the expected verification outcome: A verification event unlocks as defined while an unauthorized event leaves the account locked. It directly checks the corrective activity (Exercise allowed and disallowed events from the relevant states and verify state changes.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: A warehouse selector accepts product weights in integer grams 100–500, but one test contains 99.5 grams even though the interface accepts only integers. It does not establish the required result for this case: A verification event unlocks as defined while an unauthorized event leaves the account locked.

B:

This result may validate another testing scenario: A delivery app supports parcel weight 0.1–30.0 kg, yet testing uses only many ordinary weights in the middle of the range. It does not establish the required result for this case: A verification event unlocks as defined while an unauthorized event leaves the account locked.

C:

This result may validate another testing scenario: A team follows a fixed smoke checklist through a stable feature but refuses to explore a newly observed intermittent timeout that might hide a broader outage. It does not establish the required result for this case: A verification event unlocks as defined while an unauthorized event leaves the account locked.

Question 495

In a fictional application-delivery project, the team reports: An account service transitions from Locked to Active after a successful verification event, but tests check only the current labels without sending events. Which testing concept or underlying cause best explains the reported problem?

  1. State transition testing evaluates event-driven behavior and permitted transitions, not only static state values.
  2. Defects commonly occur near transition boundaries that middle-of-partition tests do not cover.
  3. Some condition combinations are impossible or irrelevant and need justified constraints in decision tables.
  4. White-box coverage cannot detect a missing feature that has no corresponding implementation.

Explanation

Correct Answer

A:

The most relevant explanation is: State transition testing evaluates event-driven behavior and permitted transitions, not only static state values. This describes why the original situation (An account service transitions from Locked to Active after a successful verification event, but tests check only the current labels without sending events.) merits the response: Exercise allowed and disallowed events from the relevant states and verify state changes.

Incorrect Answers

B:

This principle could explain a different testing issue: A delivery app supports parcel weight 0.1–30.0 kg, yet testing uses only many ordinary weights in the middle of the range. The present case is better explained by: State transition testing evaluates event-driven behavior and permitted transitions, not only static state values.

C:

This principle could explain a different testing issue: A lending rule uses applicant age and verified income, but the decision table includes a logically impossible state where age is below 18 and an approved adult-only income credential exists. The present case is better explained by: State transition testing evaluates event-driven behavior and permitted transitions, not only static state values.

D:

This principle could explain a different testing issue: A team has 100% branch coverage for its error-prone payment module but ignores a requirement for duplicate-charge prevention absent from all code. The present case is better explained by: State transition testing evaluates event-driven behavior and permitted transitions, not only static state values.

Question 496

In a fictional application-delivery project, the team reports: An account service transitions from Locked to Active after a successful verification event, but tests check only the current labels without sending events. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Derive boundary neighbors using the actual permitted input domain.
  2. Translate business conditions into explicit truth tables before implementation.
  3. Review scenario sets for contradictions before automation.
  4. Model states, events, guards and outcomes before selecting sequences.

Explanation

Correct Answer

D:

This safeguard specifically targets the contributing cause: Model states, events, guards and outcomes before selecting sequences. It addresses the principle (State transition testing evaluates event-driven behavior and permitted transitions, not only static state values.) and can be assessed by: A verification event unlocks as defined while an unauthorized event leaves the account locked.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 4.2): A warehouse selector accepts product weights in integer grams 100–500, but one test contains 99.5 grams even though the interface accepts only integers. The targeted safeguard for the current case is: Model states, events, guards and outcomes before selecting sequences.

B:

This preventive step mitigates a different project risk (syllabus section 4.2): A service gives free delivery when either subscription is Active or order exceeds $80, but testers assume both conditions must be true. The targeted safeguard for the current case is: Model states, events, guards and outcomes before selecting sequences.

C:

This preventive step mitigates a different project risk (syllabus section 4.5): A health portal has conflicting acceptance examples for whether an unsigned consent form can unlock record sharing, and the team implements whichever one it reads first. The targeted safeguard for the current case is: Model states, events, guards and outcomes before selecting sequences.

Question 497

A tester is asked to evaluate the following situation: A warehouse order can move Created to Paid to Shipped, yet tests attempt Created to Shipped and treat any rejection as a defect. Which testing activity or corrective action best addresses this situation?

  1. Check the defined transition table and verify both permitted and forbidden transitions.
  2. Construct a decision table representing the OR decision and test each single-true case.
  3. Split valid codes by expected calculation behavior before choosing representative cases.
  4. Add representative invalid and exception examples during collaborative scenario review.

Explanation

Correct Answer

A:

The targeted action is: Check the defined transition table and verify both permitted and forbidden transitions. It addresses the underlying software-testing principle: State machines constrain valid transitions and invalid requests can correctly be rejected. The relevant confirming evidence is: The direct Created-to-Shipped request is rejected while Created-to-Paid-to-Shipped succeeds.

Incorrect Answers

B:

This choice is a useful response to a different testing situation (section 4.2, Black-Box Test Techniques): A service gives free delivery when either subscription is Active or order exceeds $80, but testers assume both conditions must be true. The present problem instead depends on: State machines constrain valid transitions and invalid requests can correctly be rejected.

C:

This choice is a useful response to a different testing situation (section 4.2, Black-Box Test Techniques): A tax product has three region codes with different calculation policies, but testers classify all supported codes into one equivalence partition because they pass validation. The present problem instead depends on: State machines constrain valid transitions and invalid requests can correctly be rejected.

D:

This choice is a useful response to a different testing situation (section 4.5, Collaboration-based Test Approaches): A product team writes acceptance examples for the happy path only and discovers after release that malformed address input crashes shipping label creation. The present problem instead depends on: State machines constrain valid transitions and invalid requests can correctly be rejected.

Question 498

A tester is asked to evaluate the following situation: A warehouse order can move Created to Paid to Shipped, yet tests attempt Created to Shipped and treat any rejection as a defect. Which observation best verifies that the stated testing issue is addressed?

  1. One blank and one malformed coupon demonstrate the two defined rejection behaviors without redundant duplicate cases.
  2. The form accepts 5 and 50 but rejects 4 and 51 as expected.
  3. The direct Created-to-Shipped request is rejected while Created-to-Paid-to-Shipped succeeds.
  4. Instrumentation confirms the defensive outcome executes and handles zero safely.

Explanation

Correct Answer

C:

This is the expected verification outcome: The direct Created-to-Shipped request is rejected while Created-to-Paid-to-Shipped succeeds. It directly checks the corrective activity (Check the defined transition table and verify both permitted and forbidden transitions.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: A purchase form classifies coupon strings as blank, valid format, and invalid format, but a tester labels every rejected blank string as a new unique partition. It does not establish the required result for this case: The direct Created-to-Shipped request is rejected while Created-to-Paid-to-Shipped succeeds.

B:

This result may validate another testing scenario: A customer service form accepts 5–50 characters, and a tester chooses exactly 5 and 50 but never checks rejection outside the range. It does not establish the required result for this case: The direct Created-to-Shipped request is rejected while Created-to-Paid-to-Shipped succeeds.

D:

This result may validate another testing scenario: A code review finds a condition guarding division by zero but the automated suite exercises only nonzero denominators and reports a green build. It does not establish the required result for this case: The direct Created-to-Shipped request is rejected while Created-to-Paid-to-Shipped succeeds.

Question 499

A tester is asked to evaluate the following situation: A warehouse order can move Created to Paid to Shipped, yet tests attempt Created to Shipped and treat any rejection as a defect. Which testing concept or underlying cause best explains the reported problem?

  1. When multiple conditions interact, one-dimensional partitions may not cover combined decisions.
  2. Transition coverage requires considering behavior from different states and not just one start state.
  3. Checklist-based testing depends on useful, relevant guidance rather than vague completion marks.
  4. State machines constrain valid transitions and invalid requests can correctly be rejected.

Explanation

Correct Answer

D:

The most relevant explanation is: State machines constrain valid transitions and invalid requests can correctly be rejected. This describes why the original situation (A warehouse order can move Created to Paid to Shipped, yet tests attempt Created to Shipped and treat any rejection as a defect.) merits the response: Check the defined transition table and verify both permitted and forbidden transitions.

Incorrect Answers

A:

This principle could explain a different testing issue: A travel claim uses conditions 'flight cancelled' and 'replacement provided', with compensation depending on their combination; the tester groups all cancellation cases into one partition. The present case is better explained by: State machines constrain valid transitions and invalid requests can correctly be rejected.

B:

This principle could explain a different testing issue: A fraud workflow has states Review, Approved, and Rejected, but testers verify all outbound transitions only from Review and never attempt approval after rejection. The present case is better explained by: State machines constrain valid transitions and invalid requests can correctly be rejected.

C:

This principle could explain a different testing issue: A retailer's tester runs a checklist that says 'verify discounts' but never clarifies the business rules, resulting in meaningless ticks. The present case is better explained by: State machines constrain valid transitions and invalid requests can correctly be rejected.

Question 500

A tester is asked to evaluate the following situation: A warehouse order can move Created to Paid to Shipped, yet tests attempt Created to Shipped and treat any rejection as a defect. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Include negative transition cases with explicitly expected rejection behavior.
  2. Translate business conditions into explicit truth tables before implementation.
  3. Add invalid-event tests for all business-critical terminal states.
  4. Include unauthorized and prohibited outcome examples in high-impact ATDD suites.

Explanation

Correct Answer

A:

This safeguard specifically targets the contributing cause: Include negative transition cases with explicitly expected rejection behavior. It addresses the principle (State machines constrain valid transitions and invalid requests can correctly be rejected.) and can be assessed by: The direct Created-to-Shipped request is rejected while Created-to-Paid-to-Shipped succeeds.

Incorrect Answers

B:

This preventive step mitigates a different project risk (syllabus section 4.2): A service gives free delivery when either subscription is Active or order exceeds $80, but testers assume both conditions must be true. The targeted safeguard for the current case is: Include negative transition cases with explicitly expected rejection behavior.

C:

This preventive step mitigates a different project risk (syllabus section 4.2): A loyalty engine has an 'expired' terminal status but the QA suite never tests attempts to redeem a reward after expiration. The targeted safeguard for the current case is: Include negative transition cases with explicitly expected rejection behavior.

D:

This preventive step mitigates a different project risk (syllabus section 4.5): A claims workflow has a formal acceptance criterion that approved claims may be paid, but no scenario ensures a rejected claim cannot trigger payment. The targeted safeguard for the current case is: Include negative transition cases with explicitly expected rejection behavior.