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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 27

Question 260

A tester is asked to evaluate the following situation: An authentication library passes isolated component checks but fails when the mobile app calls it with a missing refresh token. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Conduct impact analysis on schema and infrastructure changes.
  2. Include negative boundary and error cases in interface contracts.
  3. Test dependent clients through the interface lifecycle.
  4. Map specific test activities to each SDLC work-product milestone.

Explanation

Correct Answer

B:

This safeguard specifically targets the contributing cause: Include negative boundary and error cases in interface contracts. It addresses the principle (Component integration testing targets interfaces and interactions that isolated components may not exercise.) and can be assessed by: An integration check reproduces the missing-token response while individual component tests still pass.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 2.2): A bank migrates a database and executes only confirmation tests of known previous defects, overlooking transactions newly broken by the migration. The targeted safeguard for the current case is: Include negative boundary and error cases in interface contracts.

C:

This preventive step mitigates a different project risk (syllabus section 2.2): 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. The targeted safeguard for the current case is: Include negative boundary and error cases in interface contracts.

D:

This preventive step mitigates a different project risk (syllabus section 2.1): 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 targeted safeguard for the current case is: Include negative boundary and error cases in interface contracts.

Question 261

A quality engineering exercise presents this condition: A shipping service passes internal API integrations but a third-party carrier uses a changed response schema and confirmations disappear. Which testing activity or corrective action best addresses this situation?

  1. Execute system integration tests using realistic carrier responses and failure conditions.
  2. Check the interaction between the module and serialization layer with representative decimal values.
  3. Add performance efficiency tests with realistic concurrent workload and response thresholds.
  4. Integrate test design and execution within each iteration and meet an agreed definition of done.

Explanation

Correct Answer

A:

The targeted action is: Execute system integration tests using realistic carrier responses and failure conditions. It addresses the underlying software-testing principle: System integration testing evaluates interactions between whole systems and external services. The relevant confirming evidence is: The integration test catches the incompatible carrier schema before customer delivery confirmations fail.

Incorrect Answers

B:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): 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 present problem instead depends on: System integration testing evaluates interactions between whole systems and external services.

C:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): An online store completes functional checkout testing but users abandon the site because a product search takes twenty seconds during peak traffic. The present problem instead depends on: System integration testing evaluates interactions between whole systems and external services.

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)): An agile team finishes coding stories during a sprint but schedules all functional tests into a distant stabilization sprint, delaying discovery of regressions. The present problem instead depends on: System integration testing evaluates interactions between whole systems and external services.

Question 262

A quality engineering exercise presents this condition: A shipping service passes internal API integrations but a third-party carrier uses a changed response schema and confirmations disappear. Which observation best verifies that the stated testing issue is addressed?

  1. The integration test catches the incompatible carrier schema before customer delivery confirmations fail.
  2. Relevant services start and complete shipment transactions on the patched platform.
  3. A customer completes a payment on each supported mobile profile without the keyboard hiding mandatory controls.
  4. Representative historical filing fixtures produce correct expected outcomes under the new runtime.

Explanation

Correct Answer

A:

This is the expected verification outcome: The integration test catches the incompatible carrier schema before customer delivery confirmations fail. It directly checks the corrective activity (Execute system integration tests using realistic carrier responses and failure conditions.) for the described testing problem.

Incorrect Answers

B:

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: The integration test catches the incompatible carrier schema before customer delivery confirmations fail.

C:

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: The integration test catches the incompatible carrier schema before customer delivery confirmations fail.

D:

This result may validate another testing scenario: A tax application migrates tax rules to a newer runtime and the test team tests only newly added features, ignoring old filings that may now calculate differently. It does not establish the required result for this case: The integration test catches the incompatible carrier schema before customer delivery confirmations fail.

Question 263

A quality engineering exercise presents this condition: A shipping service passes internal API integrations but a third-party carrier uses a changed response schema and confirmations disappear. Which testing concept or underlying cause best explains the reported problem?

  1. White-box coverage cannot reveal missing required behaviors that were never implemented.
  2. Interaction defects can occur at interfaces even when individual units meet their own specifications.
  3. System integration testing evaluates interactions between whole systems and external services.
  4. Retrospectives support process improvement only when findings become acted-on changes.

Explanation

Correct Answer

C:

The most relevant explanation is: System integration testing evaluates interactions between whole systems and external services. This describes why the original situation (A shipping service passes internal API integrations but a third-party carrier uses a changed response schema and confirmations disappear.) merits the response: Execute system integration tests using realistic carrier responses and failure conditions.

Incorrect Answers

A:

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: System integration testing evaluates interactions between whole systems and external services.

B:

This principle could explain a different testing issue: 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 present case is better explained by: System integration testing evaluates interactions between whole systems and external services.

D:

This principle could explain a different testing issue: An agile retrospective repeatedly lists environment delays but no corrective action is owned, so every iteration loses time to the same unavailable test database. The present case is better explained by: System integration testing evaluates interactions between whole systems and external services.

Question 264

A quality engineering exercise presents this condition: A shipping service passes internal API integrations but a third-party carrier uses a changed response schema and confirmations disappear. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Test critical data representation boundaries before full system release.
  2. Conduct impact analysis on schema and infrastructure changes.
  3. Maintain versioned third-party contract and failure fixtures.
  4. Link validation activities to the lifecycle artifacts that provide their test basis.

Explanation

Correct Answer

C:

This safeguard specifically targets the contributing cause: Maintain versioned third-party contract and failure fixtures. It addresses the principle (System integration testing evaluates interactions between whole systems and external services.) and can be assessed by: The integration test catches the incompatible carrier schema before customer delivery confirmations fail.

Incorrect Answers

A:

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: Maintain versioned third-party contract and failure fixtures.

B:

This preventive step mitigates a different project risk (syllabus section 2.2): A bank migrates a database and executes only confirmation tests of known previous defects, overlooking transactions newly broken by the migration. The targeted safeguard for the current case is: Maintain versioned third-party contract and failure fixtures.

D:

This preventive step mitigates a different project risk (syllabus section 2.1): A designer claims the V-model prohibits all iterative feedback and cannot support early test planning because diagrams put testing boxes after coding. The targeted safeguard for the current case is: Maintain versioned third-party contract and failure fixtures.

Question 265

A software testing team encounters the following project situation: An online store completes functional checkout testing but users abandon the site because a product search takes twenty seconds during peak traffic. Which testing activity or corrective action best addresses this situation?

  1. Add representative failure, timeout and partial-response conditions to the external interface tests.
  2. Add performance efficiency tests with realistic concurrent workload and response thresholds.
  3. Execute system integration tests using realistic carrier responses and failure conditions.
  4. Shorten the test feedback loop and use continuous testing aligned with deployment frequency and risk.

Explanation

Correct Answer

B:

The targeted action is: Add performance efficiency tests with realistic concurrent workload and response thresholds. It addresses the underlying software-testing principle: Functional testing alone does not demonstrate non-functional performance quality. The relevant confirming evidence is: Peak search latency is measured against an agreed service target under representative demand.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): A system integration test sends requests to a simulated tax provider that always returns success, so production error behavior remains untested. The present problem instead depends on: Functional testing alone does not demonstrate non-functional performance quality.

C:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): A shipping service passes internal API integrations but a third-party carrier uses a changed response schema and confirmations disappear. The present problem instead depends on: Functional testing alone does not demonstrate non-functional performance quality.

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 software team changes continuous deployment to daily releases but keeps a six-week feedback cycle for defects found in user acceptance testing. The present problem instead depends on: Functional testing alone does not demonstrate non-functional performance quality.

Question 266

A software testing team encounters the following project situation: An online store completes functional checkout testing but users abandon the site because a product search takes twenty seconds during peak traffic. Which observation best verifies that the stated testing issue is addressed?

  1. Clinicians complete an emergency override under approved policy and document accepted outcomes.
  2. The original coupon case passes and previously working combination discounts remain correct.
  3. Designers address capacity risks early and later environment tests verify representative throughput.
  4. Peak search latency is measured against an agreed service target under representative demand.

Explanation

Correct Answer

D:

This is the expected verification outcome: Peak search latency is measured against an agreed service target under representative demand. It directly checks the corrective activity (Add performance efficiency tests with realistic concurrent workload and response thresholds.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: A hospital conducts acceptance testing with only the development team's synthetic workflow, and actual clinicians find no provision for emergency priority overrides. It does not establish the required result for this case: Peak search latency is measured against an agreed service target under representative demand.

B:

This result may validate another testing scenario: A software update corrects a failed coupon rule, and testers rerun only that coupon scenario while a nearby discount-rule regression escapes. It does not establish the required result for this case: Peak search latency is measured against an agreed service target under representative demand.

C:

This result may validate another testing scenario: 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. It does not establish the required result for this case: Peak search latency is measured against an agreed service target under representative demand.

Question 267

A software testing team encounters the following project situation: An online store completes functional checkout testing but users abandon the site because a product search takes twenty seconds during peak traffic. Which testing concept or underlying cause best explains the reported problem?

  1. Non-functional reliability properties require their own relevant stimuli and expected outcomes.
  2. Functional testing alone does not demonstrate non-functional performance quality.
  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

B:

The most relevant explanation is: Functional testing alone does not demonstrate non-functional performance quality. This describes why the original situation (An online store completes functional checkout testing but users abandon the site because a product search takes twenty seconds during peak traffic.) merits the response: Add performance efficiency tests with realistic concurrent workload and response thresholds.

Incorrect Answers

A:

This principle could explain a different testing issue: An IoT controller is tested against its functional specifications but cannot restart cleanly after a power interruption. The present case is better explained by: Functional testing alone does not demonstrate non-functional performance quality.

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: Functional testing alone does not demonstrate non-functional performance quality.

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: Functional testing alone does not demonstrate non-functional performance quality.

Question 268

A software testing team encounters the following project situation: An online store completes functional checkout testing but users abandon the site because a product search takes twenty seconds during peak traffic. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Include load and capacity criteria in the system test plan.
  2. Test critical data representation boundaries before full system release.
  3. Maintain negative partner response fixtures and recovery expectations.
  4. Verify that each required executable specification has functioning step definitions and assertions.

Explanation

Correct Answer

A:

This safeguard specifically targets the contributing cause: Include load and capacity criteria in the system test plan. It addresses the principle (Functional testing alone does not demonstrate non-functional performance quality.) and can be assessed by: Peak search latency is measured against an agreed service target under representative demand.

Incorrect Answers

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: Include load and capacity criteria in the system test plan.

C:

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: Include load and capacity criteria in the system test plan.

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: Include load and capacity criteria in the system test plan.

Question 269

During a release-readiness review, a tester observes: 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. Which testing activity or corrective action best addresses this situation?

  1. Include accessibility and relevant usability testing of realistic user workflows.
  2. Test the interface contract between calling application and authentication component.
  3. Run confirmation testing for the original coupon failure plus risk-selected regression tests of related discount behavior.
  4. Add outcome-oriented quality measurements and investigate defects found after production changes.

Explanation

Correct Answer

A:

The targeted action is: Include accessibility and relevant usability testing of realistic user workflows. It addresses the underlying software-testing principle: Non-functional testing evaluates quality characteristics such as usability and accessibility. The relevant confirming evidence is: A screen-reader user can identify fields and complete the medical workflow as specified.

Incorrect Answers

B:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): An authentication library passes isolated component checks but fails when the mobile app calls it with a missing refresh token. The present problem instead depends on: Non-functional testing evaluates quality characteristics such as usability and accessibility.

C:

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 testing evaluates quality characteristics such as usability and accessibility.

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)): An organization assesses software testing success by deployment frequency alone, with no indicator of escaped high-severity failures after releases. The present problem instead depends on: Non-functional testing evaluates quality characteristics such as usability and accessibility.

Question 270

During a release-readiness review, a tester observes: 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. 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. The supported mobile client continues reading the field or receives an agreed versioned alternative.
  3. Relevant smoke and regression issues are detected before daily production promotion.
  4. A screen-reader user can identify fields and complete the medical workflow as specified.

Explanation

Correct Answer

D:

This is the expected verification outcome: A screen-reader user can identify fields and complete the medical workflow as specified. It directly checks the corrective activity (Include accessibility and relevant usability testing of realistic user workflows.) 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: A screen-reader user can identify fields and complete the medical workflow as specified.

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: A screen-reader user can identify fields and complete the medical workflow as specified.

C:

This result may validate another testing scenario: A software team changes continuous deployment to daily releases but keeps a six-week feedback cycle for defects found in user acceptance testing. It does not establish the required result for this case: A screen-reader user can identify fields and complete the medical workflow as specified.