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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 29

Question 280

In a fictional application-delivery project, the team reports: A software update corrects a failed coupon rule, and testers rerun only that coupon scenario while a nearby discount-rule regression escapes. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Require both fix evidence and impact-driven regression selection.
  2. Maintain negative partner response fixtures and recovery expectations.
  3. Add recovery fault-injection tests to relevant system-level suites.
  4. Review test cycle time and repair latency when altering release cadence.

Explanation

Correct Answer

A:

This safeguard specifically targets the contributing cause: Require both fix evidence and impact-driven regression selection. It addresses the principle (Confirmation testing checks a specific fix; regression testing checks for adverse side effects.) and can be assessed by: The original coupon case passes and previously working combination discounts remain correct.

Incorrect Answers

B:

This preventive step mitigates a different project risk (syllabus section 2.2): A system integration test sends requests to a simulated tax provider that always returns success, so production error behavior remains untested. The targeted safeguard for the current case is: Require both fix evidence and impact-driven regression selection.

C:

This preventive step mitigates a different project risk (syllabus section 2.2): An IoT controller is tested against its functional specifications but cannot restart cleanly after a power interruption. The targeted safeguard for the current case is: Require both fix evidence and impact-driven regression selection.

D:

This preventive step mitigates a different project risk (syllabus section 2.1): A software team changes continuous deployment to daily releases but keeps a six-week feedback cycle for defects found in user acceptance testing. The targeted safeguard for the current case is: Require both fix evidence and impact-driven regression selection.

Question 281

A tester is asked to evaluate the following situation: A bank migrates a database and executes only confirmation tests of known previous defects, overlooking transactions newly broken by the migration. Which testing activity or corrective action best addresses this situation?

  1. Measure internal branch or statement coverage with a white-box instrumented test suite.
  2. Plan maintenance testing focused on changed data structures and unchanged business operations that could be affected.
  3. Add specification-based black-box tests derived from business rules and exclusions.
  4. Begin relevant reviews and test design alongside each corresponding lifecycle work product instead of waiting for final execution.

Explanation

Correct Answer

B:

The targeted action is: Plan maintenance testing focused on changed data structures and unchanged business operations that could be affected. It addresses the underlying software-testing principle: Maintenance testing addresses changes to an operational system and their regression risks. The relevant confirming evidence is: Existing account transfers and balances remain correct after the schema migration.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): A mobile app team uses a black-box login test to claim every internal conditional branch has executed because the screen looked correct. The present problem instead depends on: Maintenance testing addresses changes to an operational system and their regression risks.

C:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): An insurance team executes code-based branch tests exclusively and overlooks a legally required policy exception absent from the implementation. The present problem instead depends on: Maintenance testing addresses changes to an operational system and their regression risks.

D:

This choice is a useful response to a different testing situation (section 2.1, Testing in the Context of a Software Development Lifecycle (SDLC)): A bank uses sequential requirements, design and coding phases but does not plan any testing until developers finish the whole system, leading to late feedback. The present problem instead depends on: Maintenance testing addresses changes to an operational system and their regression risks.

Question 282

A tester is asked to evaluate the following situation: A bank migrates a database and executes only confirmation tests of known previous defects, overlooking transactions newly broken by the migration. Which observation best verifies that the stated testing issue is addressed?

  1. An integration check reproduces the missing-token response while individual component tests still pass.
  2. A customer completes a payment on each supported mobile profile without the keyboard hiding mandatory controls.
  3. Existing account transfers and balances remain correct after the schema migration.
  4. The red-green-refactor cycle yields a test that fails against the initial incorrect behavior and passes after correction.

Explanation

Correct Answer

C:

This is the expected verification outcome: Existing account transfers and balances remain correct after the schema migration. It directly checks the corrective activity (Plan maintenance testing focused on changed data structures and unchanged business operations that could be affected.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: An authentication library passes isolated component checks but fails when the mobile app calls it with a missing refresh token. It does not establish the required result for this case: Existing account transfers and balances remain correct after the schema migration.

B:

This result may validate another testing scenario: A browser-based app performs exactly to requirements on desktop but cannot complete payment on supported mobile devices with a virtual keyboard covering the submit button. It does not establish the required result for this case: Existing account transfers and balances remain correct after the schema migration.

D:

This result may validate another testing scenario: A programmer writes production code before deciding what a small calculation should return, then adds a test that simply mirrors the implemented algorithm's wrong result. It does not establish the required result for this case: Existing account transfers and balances remain correct after the schema migration.

Question 283

A tester is asked to evaluate the following situation: A bank migrates a database and executes only confirmation tests of known previous defects, overlooking transactions newly broken by the migration. Which testing concept or underlying cause best explains the reported problem?

  1. Maintenance testing addresses changes to an operational system and their regression risks.
  2. White-box coverage cannot reveal missing required behaviors that were never implemented.
  3. Functional and non-functional test types target different quality questions and are complementary.
  4. DevOps feedback benefits from frequent automated verification but testing remains necessary beyond a successful build.

Explanation

Correct Answer

A:

The most relevant explanation is: Maintenance testing addresses changes to an operational system and their regression risks. This describes why the original situation (A bank migrates a database and executes only confirmation tests of known previous defects, overlooking transactions newly broken by the migration.) merits the response: Plan maintenance testing focused on changed data structures and unchanged business operations that could be affected.

Incorrect Answers

B:

This principle could explain a different testing issue: An insurance team executes code-based branch tests exclusively and overlooks a legally required policy exception absent from the implementation. The present case is better explained by: Maintenance testing addresses changes to an operational system and their regression risks.

C:

This principle could explain a different testing issue: A payment provider creates a new authentication algorithm and counts a security penetration test as proof that its business rules calculate fees correctly. The present case is better explained by: Maintenance testing addresses changes to an operational system and their regression risks.

D:

This principle could explain a different testing issue: A retail team's CI pipeline deploys a checkout update after compilation only, leaving high-impact payment tests for a weekly manual run. The present case is better explained by: Maintenance testing addresses changes to an operational system and their regression risks.

Question 284

A tester is asked to evaluate the following situation: A bank migrates a database and executes only confirmation tests of known previous defects, overlooking transactions newly broken by the migration. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Make accessibility criteria and assistive technology part of system acceptance.
  2. Test critical data representation boundaries before full system release.
  3. Conduct impact analysis on schema and infrastructure changes.
  4. Assign early analysis and subsequent executable checks to the correct delivery stages.

Explanation

Correct Answer

C:

This safeguard specifically targets the contributing cause: Conduct impact analysis on schema and infrastructure changes. It addresses the principle (Maintenance testing addresses changes to an operational system and their regression risks.) and can be assessed by: Existing account transfers and balances remain correct after the schema migration.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 2.2): A medical web app performs every required calculation but shows unreadable labels to screen-reader users, and the team says accessibility is outside all testing. The targeted safeguard for the current case is: Conduct impact analysis on schema and infrastructure changes.

B:

This preventive step mitigates a different project risk (syllabus section 2.2): A new tax calculation component returns correct totals to its local unit tests but yields different rounding when invoked through the API currency serialization layer. The targeted safeguard for the current case is: Conduct impact analysis on schema and infrastructure changes.

D:

This preventive step mitigates a different project risk (syllabus section 2.1): A product manager says shift-left means moving every production load test into the first day of requirements discovery, even before an executable performance environment exists. The targeted safeguard for the current case is: Conduct impact analysis on schema and infrastructure changes.

Question 285

A quality engineering exercise presents this condition: A payment provider creates a new authentication algorithm and counts a security penetration test as proof that its business rules calculate fees correctly. Which testing activity or corrective action best addresses this situation?

  1. Run confirmation testing for the original coupon failure plus risk-selected regression tests of related discount behavior.
  2. Add specification-based black-box tests derived from business rules and exclusions.
  3. Use suitable functional tests for fee rules and security tests for access and abuse risks.
  4. Verify completeness, correctness and accessibility of the exported records as part of retirement maintenance testing.

Explanation

Correct Answer

C:

The targeted action is: Use suitable functional tests for fee rules and security tests for access and abuse risks. It addresses the underlying software-testing principle: Functional and non-functional test types target different quality questions and are complementary. The relevant confirming evidence is: Separate reports demonstrate correct fees and absence of discovered privilege bypass in tested scenarios.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): A software update corrects a failed coupon rule, and testers rerun only that coupon scenario while a nearby discount-rule regression escapes. The present problem instead depends on: Functional and non-functional test types target different quality questions and are complementary.

B:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): An insurance team executes code-based branch tests exclusively and overlooks a legally required policy exception absent from the implementation. The present problem instead depends on: Functional and non-functional test types target different quality questions and are complementary.

D:

This choice is a useful response to a different testing situation (section 2.3, Maintenance Testing): An ERP is partially retired and a data export process is introduced, but test planning excludes archival integrity because no new user interface was built. The present problem instead depends on: Functional and non-functional test types target different quality questions and are complementary.

Question 286

A quality engineering exercise presents this condition: A payment provider creates a new authentication algorithm and counts a security penetration test as proof that its business rules calculate fees correctly. Which observation best verifies that the stated testing issue is addressed?

  1. Separate reports demonstrate correct fees and absence of discovered privilege bypass in tested scenarios.
  2. The supported mobile client continues reading the field or receives an agreed versioned alternative.
  3. Relevant services start and complete shipment transactions on the patched platform.
  4. A story is not marked done until its functional and regression acceptance checks complete.

Explanation

Correct Answer

A:

This is the expected verification outcome: Separate reports demonstrate correct fees and absence of discovered privilege bypass in tested scenarios. It directly checks the corrective activity (Use suitable functional tests for fee rules and security tests for access and abuse risks.) for the described testing problem.

Incorrect Answers

B:

This result may validate another testing scenario: A content platform redesign removes a field from its API but deploys the change without checking the mobile app consumer, causing an existing feature to break. It does not establish the required result for this case: Separate reports demonstrate correct fees and absence of discovered privilege bypass in tested scenarios.

C:

This result may validate another testing scenario: A logistics company patches a production operating system and assumes maintenance testing is unnecessary because no application source code changed. It does not establish the required result for this case: Separate reports demonstrate correct fees and absence of discovered privilege bypass in tested scenarios.

D:

This result may validate another testing scenario: An agile team finishes coding stories during a sprint but schedules all functional tests into a distant stabilization sprint, delaying discovery of regressions. It does not establish the required result for this case: Separate reports demonstrate correct fees and absence of discovered privilege bypass in tested scenarios.

Question 287

A quality engineering exercise presents this condition: A payment provider creates a new authentication algorithm and counts a security penetration test as proof that its business rules calculate fees correctly. Which testing concept or underlying cause best explains the reported problem?

  1. Maintenance testing addresses changes to an operational system and their regression risks.
  2. Functional and non-functional test types target different quality questions and are complementary.
  3. Validated happy-path integration does not establish resilience under realistic dependent-service failures.
  4. Maintenance changes can propagate risk into external systems connected to the modified interface.

Explanation

Correct Answer

B:

The most relevant explanation is: Functional and non-functional test types target different quality questions and are complementary. This describes why the original situation (A payment provider creates a new authentication algorithm and counts a security penetration test as proof that its business rules calculate fees correctly.) merits the response: Use suitable functional tests for fee rules and security tests for access and abuse risks.

Incorrect Answers

A:

This principle could explain a different testing issue: A bank migrates a database and executes only confirmation tests of known previous defects, overlooking transactions newly broken by the migration. The present case is better explained by: Functional and non-functional test types target different quality questions and are complementary.

C:

This principle could explain a different testing issue: A system integration test sends requests to a simulated tax provider that always returns success, so production error behavior remains untested. The present case is better explained by: Functional and non-functional test types target different quality questions and are complementary.

D:

This principle could explain a different testing issue: An API provider deprecates an endpoint, but clients continue using it because the maintenance team tests only the provider's new implementation. The present case is better explained by: Functional and non-functional test types target different quality questions and are complementary.

Question 288

A quality engineering exercise presents this condition: A payment provider creates a new authentication algorithm and counts a security penetration test as proof that its business rules calculate fees correctly. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Make accessibility criteria and assistive technology part of system acceptance.
  2. Treat platform and dependency upgrades as triggers for change-impact testing.
  3. Document which quality characteristics each suite actually addresses.
  4. Verify that each required executable specification has functioning step definitions and assertions.

Explanation

Correct Answer

C:

This safeguard specifically targets the contributing cause: Document which quality characteristics each suite actually addresses. It addresses the principle (Functional and non-functional test types target different quality questions and are complementary.) and can be assessed by: Separate reports demonstrate correct fees and absence of discovered privilege bypass in tested scenarios.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 2.2): A medical web app performs every required calculation but shows unreadable labels to screen-reader users, and the team says accessibility is outside all testing. The targeted safeguard for the current case is: Document which quality characteristics each suite actually addresses.

B:

This preventive step mitigates a different project risk (syllabus section 2.2): A logistics company patches a production operating system and assumes maintenance testing is unnecessary because no application source code changed. The targeted safeguard for the current case is: Document which quality characteristics each suite actually addresses.

D:

This preventive step mitigates a different project risk (syllabus section 2.1): A project team interprets a written Gherkin scenario as an executable automated test, although no implementation links it to product behavior. The targeted safeguard for the current case is: Document which quality characteristics each suite actually addresses.

Question 289

A software testing team encounters the following project situation: An IoT controller is tested against its functional specifications but cannot restart cleanly after a power interruption. Which testing activity or corrective action best addresses this situation?

  1. Plan maintenance testing focused on changed data structures and unchanged business operations that could be affected.
  2. Run confirmation testing for the original coupon failure plus risk-selected regression tests of related discount behavior.
  3. Include recovery and reliability checks for the system's operational fault conditions.
  4. Distinguish collaboratively specified acceptance examples from executable tests and implement the appropriate supporting checks.

Explanation

Correct Answer

C:

The targeted action is: Include recovery and reliability checks for the system's operational fault conditions. It addresses the underlying software-testing principle: Non-functional reliability properties require their own relevant stimuli and expected outcomes. The relevant confirming evidence is: A controlled power-cycle retains safe state and resumes permitted functions within the recovery target.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): A bank migrates a database and executes only confirmation tests of known previous defects, overlooking transactions newly broken by the migration. The present problem instead depends on: Non-functional reliability properties require their own relevant stimuli and expected outcomes.

B:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): A software update corrects a failed coupon rule, and testers rerun only that coupon scenario while a nearby discount-rule regression escapes. The present problem instead depends on: Non-functional reliability properties require their own relevant stimuli and expected outcomes.

D:

This choice is a useful response to a different testing situation (section 2.1, Testing in the Context of a Software Development Lifecycle (SDLC)): A project team interprets a written Gherkin scenario as an executable automated test, although no implementation links it to product behavior. The present problem instead depends on: Non-functional reliability properties require their own relevant stimuli and expected outcomes.

Question 290

A software testing team encounters the following project situation: An IoT controller is tested against its functional specifications but cannot restart cleanly after a power interruption. Which observation best verifies that the stated testing issue is addressed?

  1. API integration passes its contract and users independently confirm the end-to-end goal.
  2. The missed legal exception fails a test even though existing branch coverage remains high.
  3. A controlled power-cycle retains safe state and resumes permitted functions within the recovery target.
  4. The acceptance example is connected to an executable check that fails when the business rule is violated.

Explanation

Correct Answer

C:

This is the expected verification outcome: A controlled power-cycle retains safe state and resumes permitted functions within the recovery target. It directly checks the corrective activity (Include recovery and reliability checks for the system's operational fault conditions.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: A technical team labels a database API contract test as an acceptance test even though no business stakeholder has approved end-to-end usefulness criteria. It does not establish the required result for this case: A controlled power-cycle retains safe state and resumes permitted functions within the recovery target.

B:

This result may validate another testing scenario: An insurance team executes code-based branch tests exclusively and overlooks a legally required policy exception absent from the implementation. It does not establish the required result for this case: A controlled power-cycle retains safe state and resumes permitted functions within the recovery target.

D:

This result may validate another testing scenario: A project team interprets a written Gherkin scenario as an executable automated test, although no implementation links it to product behavior. It does not establish the required result for this case: A controlled power-cycle retains safe state and resumes permitted functions within the recovery target.