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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 1

Question 1

A software testing team encounters the following project situation: A billing team treats checking an invoice against its written pricing rules as debugging, and asks testers to locate the faulty line of code before reporting any mismatch. Which testing activity or corrective action best addresses this situation?

  1. Compare observed totals with the pricing rule and report any discrepancy without assuming where the defect resides.
  2. Analyze the changed rules and select new negative, boundary, and exception tests appropriate to the change.
  3. Identify the ambiguity early through review and clarify the rule before repeating implementation or execution.
  4. Introduce early review and test activities where design decisions are still inexpensive to change.

Explanation

Correct Answer

A:

The targeted action is: Compare observed totals with the pricing rule and report any discrepancy without assuming where the defect resides. It addresses the underlying software-testing principle: Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure. The relevant confirming evidence is: The test record identifies the incorrect total and reproducing input, while developer debugging is handled separately.

Incorrect Answers

B:

This choice is a useful response to a different testing situation (section 1.1, What is Testing?): A finance project runs the same ten positive-path checks on every release and calls that sufficient evidence for tax rounding changes. The present problem instead depends on: Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure.

C:

This choice is a useful response to a different testing situation (section 1.1, What is Testing?): A retailer reviews product requirements only after code is deployed and discovers an ambiguous return window that all developers implemented differently. The present problem instead depends on: Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure.

D:

This choice is a useful response to a different testing situation (section 1.3, Testing Principles): A bank queues all security testing for the final release weekend, and a permissions architecture defect forces a redesign. The present problem instead depends on: Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure.

Question 2

A software testing team encounters the following project situation: A billing team treats checking an invoice against its written pricing rules as debugging, and asks testers to locate the faulty line of code before reporting any mismatch. Which observation best verifies that the stated testing issue is addressed?

  1. Practitioners complete realistic scheduling tasks within agreed usability and accuracy criteria.
  2. The defect has a confirmed fix and a passing repeat of the initially failing case.
  3. The test record identifies the incorrect total and reproducing input, while developer debugging is handled separately.
  4. A reviewer identifies a missing negative case not considered by the original developer.

Explanation

Correct Answer

C:

This is the expected verification outcome: The test record identifies the incorrect total and reproducing input, while developer debugging is handled separately. It directly checks the corrective activity (Compare observed totals with the pricing rule and report any discrepancy without assuming where the defect resides.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: A healthcare scheduling team calls a product successful after every implemented feature works, though nurses cannot efficiently complete the real appointment task. It does not establish the required result for this case: The test record identifies the incorrect total and reproducing input, while developer debugging is handled separately.

B:

This result may validate another testing scenario: A mobile banking tester documents a wrong transfer confirmation message but the project manager counts the ticket itself as a completed correction. It does not establish the required result for this case: The test record identifies the incorrect total and reproducing input, while developer debugging is handled separately.

D:

This result may validate another testing scenario: A component's author is the only person testing it and consistently overlooks the same assumptions embedded in both code and test data. It does not establish the required result for this case: The test record identifies the incorrect total and reproducing input, while developer debugging is handled separately.

Question 3

A software testing team encounters the following project situation: A billing team treats checking an invoice against its written pricing rules as debugging, and asks testers to locate the faulty line of code before reporting any mismatch. Which testing concept or underlying cause best explains the reported problem?

  1. Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure.
  2. Test planning and specification exist at different abstraction levels and each supports different decisions.
  3. Repeating an unchanged test suite may no longer achieve the objective of detecting defects introduced by new behavior.
  4. An observed failure can be caused by one or more defects, which may originate from earlier human mistakes.

Explanation

Correct Answer

A:

The most relevant explanation is: Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure. This describes why the original situation (A billing team treats checking an invoice against its written pricing rules as debugging, and asks testers to locate the faulty line of code before reporting any mismatch.) merits the response: Compare observed totals with the pricing rule and report any discrepancy without assuming where the defect resides.

Incorrect Answers

B:

This principle could explain a different testing issue: A warehouse team treats a test strategy statement and the executable test cases as interchangeable, leaving no defined approach to choosing cases. The present case is better explained by: Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure.

C:

This principle could explain a different testing issue: A finance project runs the same ten positive-path checks on every release and calls that sufficient evidence for tax rounding changes. The present case is better explained by: Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure.

D:

This principle could explain a different testing issue: A courier tracking failure originates from a requirement that confused local and UTC times, but the incident report labels the observed wrong ETA as the root cause. The present case is better explained by: Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure.

Question 4

A software testing team encounters the following project situation: A billing team treats checking an invoice against its written pricing rules as debugging, and asks testers to locate the faulty line of code before reporting any mismatch. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Include stakeholders and realistic operational scenarios when defining acceptance objectives.
  2. Include a reviewed expected-result field in the test case design standard.
  3. Provide charter objectives and evidence expectations for exploratory sessions.
  4. Distinguish test execution, fault reporting, debugging, and confirmation testing in the team's handoff checklist.

Explanation

Correct Answer

D:

This safeguard specifically targets the contributing cause: Distinguish test execution, fault reporting, debugging, and confirmation testing in the team's handoff checklist. It addresses the principle (Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure.) and can be assessed by: The test record identifies the incorrect total and reproducing input, while developer debugging is handled separately.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 1.1): A healthcare scheduling team calls a product successful after every implemented feature works, though nurses cannot efficiently complete the real appointment task. The targeted safeguard for the current case is: Distinguish test execution, fault reporting, debugging, and confirmation testing in the team's handoff checklist.

B:

This preventive step mitigates a different project risk (syllabus section 1.1): A delivery-app tester executes scripted checks but does not record the expected result for a promotional fee calculation, so a different fee is accepted as correct. The targeted safeguard for the current case is: Distinguish test execution, fault reporting, debugging, and confirmation testing in the team's handoff checklist.

C:

This preventive step mitigates a different project risk (syllabus section 1.5): An exploratory tester discovers a serious accessibility issue but a product owner dismisses the finding because no detailed scripted test case existed first. The targeted safeguard for the current case is: Distinguish test execution, fault reporting, debugging, and confirmation testing in the team's handoff checklist.

Question 5

During a release-readiness review, a tester observes: An online marketplace releases a checkout flow after tests show no errors, and its sponsor declares the service mathematically defect free. Which testing activity or corrective action best addresses this situation?

  1. Report the test coverage and residual risks instead of promising that passing tests prove the absence of defects.
  2. Establish high-level test goals and approach separately from specific test conditions, cases, and procedures.
  3. Identify what is intentionally checked against an expectation and distinguish that from passive operational monitoring.
  4. Assess the cost and severity of plausible failures and prioritize tests that reduce the most significant business risks.

Explanation

Correct Answer

A:

The targeted action is: Report the test coverage and residual risks instead of promising that passing tests prove the absence of defects. It addresses the underlying software-testing principle: Tests can demonstrate the presence of failures but cannot establish exhaustive absence of defects. The relevant confirming evidence is: The release decision includes tested conditions and known untested combinations rather than a zero-defect guarantee.

Incorrect Answers

B:

This choice is a useful response to a different testing situation (section 1.1, What is Testing?): A warehouse team treats a test strategy statement and the executable test cases as interchangeable, leaving no defined approach to choosing cases. The present problem instead depends on: Tests can demonstrate the presence of failures but cannot establish exhaustive absence of defects.

C:

This choice is a useful response to a different testing situation (section 1.1, What is Testing?): A streaming provider considers all monitoring alerts to be test cases, although the alerts only collect production symptoms after deployment. The present problem instead depends on: Tests can demonstrate the presence of failures but cannot establish exhaustive absence of defects.

D:

This choice is a useful response to a different testing situation (section 1.2, Why is Testing Necessary?): A company removes all planned test work to meet a deadline, arguing testing never generates visible revenue and is therefore wasteful. The present problem instead depends on: Tests can demonstrate the presence of failures but cannot establish exhaustive absence of defects.

Question 6

During a release-readiness review, a tester observes: An online marketplace releases a checkout flow after tests show no errors, and its sponsor declares the service mathematically defect free. Which observation best verifies that the stated testing issue is addressed?

  1. A revised requirement gives one unambiguous return window and related tests agree with that interpretation.
  2. The saved case records test data, the expected calculation, observed total, and pass or fail decision.
  3. Teams enforce coding standards and peer review, and tests provide objective product evidence.
  4. The release decision includes tested conditions and known untested combinations rather than a zero-defect guarantee.

Explanation

Correct Answer

D:

This is the expected verification outcome: The release decision includes tested conditions and known untested combinations rather than a zero-defect guarantee. It directly checks the corrective activity (Report the test coverage and residual risks instead of promising that passing tests prove the absence of defects.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: A retailer reviews product requirements only after code is deployed and discovers an ambiguous return window that all developers implemented differently. It does not establish the required result for this case: The release decision includes tested conditions and known untested combinations rather than a zero-defect guarantee.

B:

This result may validate another testing scenario: A delivery-app tester executes scripted checks but does not record the expected result for a promotional fee calculation, so a different fee is accepted as correct. It does not establish the required result for this case: The release decision includes tested conditions and known untested combinations rather than a zero-defect guarantee.

C:

This result may validate another testing scenario: A booking team assumes testers own all quality assurance because they are the only people executing checks, so design reviews and coding standards are dropped. It does not establish the required result for this case: The release decision includes tested conditions and known untested combinations rather than a zero-defect guarantee.

Question 7

During a release-readiness review, a tester observes: An online marketplace releases a checkout flow after tests show no errors, and its sponsor declares the service mathematically defect free. Which testing concept or underlying cause best explains the reported problem?

  1. Tests require an oracle or stated expected outcome to distinguish acceptable behavior from unexpected results.
  2. Testing evaluates software or related work products; debugging locates and fixes the source of an observed failure.
  3. Tests can demonstrate the presence of failures but cannot establish exhaustive absence of defects.
  4. A software failure can arise from interactions and environmental conditions, not only a defect in a single code component.

Explanation

Correct Answer

C:

The most relevant explanation is: Tests can demonstrate the presence of failures but cannot establish exhaustive absence of defects. This describes why the original situation (An online marketplace releases a checkout flow after tests show no errors, and its sponsor declares the service mathematically defect free.) merits the response: Report the test coverage and residual risks instead of promising that passing tests prove the absence of defects.

Incorrect Answers

A:

This principle could explain a different testing issue: A delivery-app tester executes scripted checks but does not record the expected result for a promotional fee calculation, so a different fee is accepted as correct. The present case is better explained by: Tests can demonstrate the presence of failures but cannot establish exhaustive absence of defects.

B:

This principle could explain a different testing issue: A billing team treats checking an invoice against its written pricing rules as debugging, and asks testers to locate the faulty line of code before reporting any mismatch. The present case is better explained by: Tests can demonstrate the presence of failures but cannot establish exhaustive absence of defects.

D:

This principle could explain a different testing issue: A fintech product has a correct checkout engine, but an expired third-party payment certificate causes transaction failures only in the live environment. The present case is better explained by: Tests can demonstrate the presence of failures but cannot establish exhaustive absence of defects.

Question 8

During a release-readiness review, a tester observes: An online marketplace releases a checkout flow after tests show no errors, and its sponsor declares the service mathematically defect free. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Require evidence-based release statements with explicit scope and remaining uncertainty.
  2. Include a reviewed expected-result field in the test case design standard.
  3. Link important observed production incidents to reproducible regression cases.
  4. Use risk assessment and systematic selection instead of unbounded all-combinations claims.

Explanation

Correct Answer

A:

This safeguard specifically targets the contributing cause: Require evidence-based release statements with explicit scope and remaining uncertainty. It addresses the principle (Tests can demonstrate the presence of failures but cannot establish exhaustive absence of defects.) and can be assessed by: The release decision includes tested conditions and known untested combinations rather than a zero-defect guarantee.

Incorrect Answers

B:

This preventive step mitigates a different project risk (syllabus section 1.1): A delivery-app tester executes scripted checks but does not record the expected result for a promotional fee calculation, so a different fee is accepted as correct. The targeted safeguard for the current case is: Require evidence-based release statements with explicit scope and remaining uncertainty.

C:

This preventive step mitigates a different project risk (syllabus section 1.1): A streaming provider considers all monitoring alerts to be test cases, although the alerts only collect production symptoms after deployment. The targeted safeguard for the current case is: Require evidence-based release statements with explicit scope and remaining uncertainty.

D:

This preventive step mitigates a different project risk (syllabus section 1.3): A travel-site team executes every conceivable destination, browser, payment, and language combination in its test plan despite an impossible schedule. The targeted safeguard for the current case is: Require evidence-based release statements with explicit scope and remaining uncertainty.

Question 9

A test analyst investigates the following quality concern: A delivery-app tester executes scripted checks but does not record the expected result for a promotional fee calculation, so a different fee is accepted as correct. Which testing activity or corrective action best addresses this situation?

  1. Evaluate whether the deliberate destructive behavior was authorized and whether the observed result met its test objective.
  2. Analyze the changed rules and select new negative, boundary, and exception tests appropriate to the change.
  3. Derive the expected amount from the applicable rule before running the input and compare it with the actual amount.
  4. Link the test condition and case to its source requirement and related risk.

Explanation

Correct Answer

C:

The targeted action is: Derive the expected amount from the applicable rule before running the input and compare it with the actual amount. It addresses the underlying software-testing principle: Tests require an oracle or stated expected outcome to distinguish acceptable behavior from unexpected results. The relevant confirming evidence is: The saved case records test data, the expected calculation, observed total, and pass or fail decision.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 1.1, What is Testing?): A team runs an API security test that unexpectedly deletes a staging account, then argues that any test causing impact is inherently unsuccessful. The present problem instead depends on: Tests require an oracle or stated expected outcome to distinguish acceptable behavior from unexpected results.

B:

This choice is a useful response to a different testing situation (section 1.1, What is Testing?): A finance project runs the same ten positive-path checks on every release and calls that sufficient evidence for tax rounding changes. The present problem instead depends on: Tests require an oracle or stated expected outcome to distinguish acceptable behavior from unexpected results.

D:

This choice is a useful response to a different testing situation (section 1.4, Test Activities, Testware and Test Roles): A team executes a price-change test but cannot tell which requirement or risk the test covers, so auditors cannot verify why it exists. The present problem instead depends on: Tests require an oracle or stated expected outcome to distinguish acceptable behavior from unexpected results.

Question 10

A test analyst investigates the following quality concern: A delivery-app tester executes scripted checks but does not record the expected result for a promotional fee calculation, so a different fee is accepted as correct. Which observation best verifies that the stated testing issue is addressed?

  1. The saved case records test data, the expected calculation, observed total, and pass or fail decision.
  2. The release decision includes tested conditions and known untested combinations rather than a zero-defect guarantee.
  3. A targeted test stimulates a specified failure mode and checks an expected recovery behavior.
  4. A new schema incompatibility is caught by updated checks instead of appearing as wrong customer tax.

Explanation

Correct Answer

A:

This is the expected verification outcome: The saved case records test data, the expected calculation, observed total, and pass or fail decision. It directly checks the corrective activity (Derive the expected amount from the applicable rule before running the input and compare it with the actual amount.) for the described testing problem.

Incorrect Answers

B:

This result may validate another testing scenario: An online marketplace releases a checkout flow after tests show no errors, and its sponsor declares the service mathematically defect free. It does not establish the required result for this case: The saved case records test data, the expected calculation, observed total, and pass or fail decision.

C:

This result may validate another testing scenario: A streaming provider considers all monitoring alerts to be test cases, although the alerts only collect production symptoms after deployment. It does not establish the required result for this case: The saved case records test data, the expected calculation, observed total, and pass or fail decision.

D:

This result may validate another testing scenario: A tax service shows repeated successful automated results but its external rate provider changes an API contract overnight. It does not establish the required result for this case: The saved case records test data, the expected calculation, observed total, and pass or fail decision.