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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 46

Question 450

A tester is asked to evaluate the following situation: A team chooses randomized inputs for a shipping discount before reading the discount rule, then claims it has performed systematic specification-based test design. Which observation best verifies that the stated testing issue is addressed?

  1. Each documented discount class has a representative input with an expected total.
  2. The eligibility cases cover relevant combinations and the search uses representative text classes.
  3. The suite includes newly specified age limits plus failure patterns from previous releases.
  4. The report identifies actual executed statements and excludes unreachable or generated code according to stated rules.

Explanation

Correct Answer

A:

This is the expected verification outcome: Each documented discount class has a representative input with an expected total. It directly checks the corrective activity (Derive test conditions from the rule and select a suitable black-box technique for discount ranges.) for the described testing problem.

Incorrect Answers

B:

This result may validate another testing scenario: A team always selects decision tables for simple free-text search without constraints and reserves no method for a complex eligibility rule with multiple conditions. It does not establish the required result for this case: Each documented discount class has a representative input with an expected total.

C:

This result may validate another testing scenario: A tester relies on a checklist of historic outages and misses a newly required age boundary in a registration feature. It does not establish the required result for this case: Each documented discount class has a representative input with an expected total.

D:

This result may validate another testing scenario: A developer asserts 100% statement coverage can be established by inspecting the code without running any instrumentation or test execution. It does not establish the required result for this case: Each documented discount class has a representative input with an expected total.

Question 451

A tester is asked to evaluate the following situation: A team chooses randomized inputs for a shipping discount before reading the discount rule, then claims it has performed systematic specification-based test design. Which testing concept or underlying cause best explains the reported problem?

  1. Black-box techniques derive tests from the specified behavior without needing code structure.
  2. White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage.
  3. Test quantity is not equivalent to coverage across black-box or white-box criteria.
  4. Inconsistent acceptance examples create conflicting test oracles and implementation expectations.

Explanation

Correct Answer

A:

The most relevant explanation is: Black-box techniques derive tests from the specified behavior without needing code structure. This describes why the original situation (A team chooses randomized inputs for a shipping discount before reading the discount rule, then claims it has performed systematic specification-based test design.) merits the response: Derive test conditions from the rule and select a suitable black-box technique for discount ranges.

Incorrect Answers

B:

This principle could explain a different testing issue: A programmer obtains statement coverage for an unfamiliar tax module but declares that the work proves the legal requirements are complete. The present case is better explained by: Black-box techniques derive tests from the specified behavior without needing code structure.

C:

This principle could explain a different testing issue: A team treats automated test-count growth as proof that it has covered every requirement and structural path. The present case is better explained by: Black-box techniques derive tests from the specified behavior without needing code structure.

D:

This principle could explain a different testing issue: 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 present case is better explained by: Black-box techniques derive tests from the specified behavior without needing code structure.

Question 452

A tester is asked to evaluate the following situation: A team chooses randomized inputs for a shipping discount before reading the discount rule, then claims it has performed systematic specification-based test design. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Combine fresh requirements analysis with historical defect lessons.
  2. Review the test basis before choosing design techniques and input values.
  3. Combine structural and business-rule coverage when selecting a test approach.
  4. Include lower and upper nearest invalid neighbors in length-validation test design.

Explanation

Correct Answer

B:

This safeguard specifically targets the contributing cause: Review the test basis before choosing design techniques and input values. It addresses the principle (Black-box techniques derive tests from the specified behavior without needing code structure.) and can be assessed by: Each documented discount class has a representative input with an expected total.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 4.1): A tester relies on a checklist of historic outages and misses a newly required age boundary in a registration feature. The targeted safeguard for the current case is: Review the test basis before choosing design techniques and input values.

C:

This preventive step mitigates a different project risk (syllabus section 4.1): A programmer obtains statement coverage for an unfamiliar tax module but declares that the work proves the legal requirements are complete. The targeted safeguard for the current case is: Review the test basis before choosing design techniques and input values.

D:

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: Review the test basis before choosing design techniques and input values.

Question 453

A quality engineering exercise presents this condition: A programmer obtains statement coverage for an unfamiliar tax module but declares that the work proves the legal requirements are complete. Which testing activity or corrective action best addresses this situation?

  1. Measure separately which requirement conditions and structural items are exercised by the tests.
  2. Supplement structural coverage with specification-derived tests of all applicable tax requirements.
  3. Match test techniques to the work product: suitable partitions for search and decision tables for the eligibility logic.
  4. Select additional inputs to execute each decision's true and false outcomes.

Explanation

Correct Answer

B:

The targeted action is: Supplement structural coverage with specification-derived tests of all applicable tax requirements. It addresses the underlying software-testing principle: White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage. The relevant confirming evidence is: A missing legislative exception is revealed by a rule-based test despite high code coverage.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 4.1, Test Techniques Overview): A team treats automated test-count growth as proof that it has covered every requirement and structural path. The present problem instead depends on: White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage.

C:

This choice is a useful response to a different testing situation (section 4.1, Test Techniques Overview): A team always selects decision tables for simple free-text search without constraints and reserves no method for a complex eligibility rule with multiple conditions. The present problem instead depends on: White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage.

D:

This choice is a useful response to a different testing situation (section 4.3, White-Box Test Techniques): A parser contains two independent if decisions and the tester executes only an input that makes both conditions true. The present problem instead depends on: White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage.

Question 454

A quality engineering exercise presents this condition: A programmer obtains statement coverage for an unfamiliar tax module but declares that the work proves the legal requirements are complete. Which observation best verifies that the stated testing issue is addressed?

  1. A missing legislative exception is revealed by a rule-based test despite high code coverage.
  2. Each documented discount class has a representative input with an expected total.
  3. The suite includes newly specified age limits plus failure patterns from previous releases.
  4. Coverage counters show the discount path and the no-discount path each ran.

Explanation

Correct Answer

A:

This is the expected verification outcome: A missing legislative exception is revealed by a rule-based test despite high code coverage. It directly checks the corrective activity (Supplement structural coverage with specification-derived tests of all applicable tax requirements.) for the described testing problem.

Incorrect Answers

B:

This result may validate another testing scenario: A team chooses randomized inputs for a shipping discount before reading the discount rule, then claims it has performed systematic specification-based test design. It does not establish the required result for this case: A missing legislative exception is revealed by a rule-based test despite high code coverage.

C:

This result may validate another testing scenario: A tester relies on a checklist of historic outages and misses a newly required age boundary in a registration feature. It does not establish the required result for this case: A missing legislative exception is revealed by a rule-based test despite high code coverage.

D:

This result may validate another testing scenario: A component contains an if branch that computes a discount only for Premium customers, and tests cover Premium input alone yet report 100% branch coverage. It does not establish the required result for this case: A missing legislative exception is revealed by a rule-based test despite high code coverage.

Question 455

A quality engineering exercise presents this condition: A programmer obtains statement coverage for an unfamiliar tax module but declares that the work proves the legal requirements are complete. Which testing concept or underlying cause best explains the reported problem?

  1. Test quantity is not equivalent to coverage across black-box or white-box criteria.
  2. Black-box techniques derive tests from the specified behavior without needing code structure.
  3. White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage.
  4. Covering only one range edge does not satisfy complete boundary analysis of a two-ended interval.

Explanation

Correct Answer

C:

The most relevant explanation is: White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage. This describes why the original situation (A programmer obtains statement coverage for an unfamiliar tax module but declares that the work proves the legal requirements are complete.) merits the response: Supplement structural coverage with specification-derived tests of all applicable tax requirements.

Incorrect Answers

A:

This principle could explain a different testing issue: A team treats automated test-count growth as proof that it has covered every requirement and structural path. The present case is better explained by: White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage.

B:

This principle could explain a different testing issue: A team chooses randomized inputs for a shipping discount before reading the discount rule, then claims it has performed systematic specification-based test design. The present case is better explained by: White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage.

D:

This principle could explain a different testing issue: A pharmacy system supports refill counts 0–3 but a tester chooses -1, 0, 1 and 2, claiming both the minimum and maximum boundaries are covered. The present case is better explained by: White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage.

Question 456

A quality engineering exercise presents this condition: A programmer obtains statement coverage for an unfamiliar tax module but declares that the work proves the legal requirements are complete. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Review the test basis before choosing design techniques and input values.
  2. State the rationale for each test design method in test planning.
  3. Combine structural and business-rule coverage when selecting a test approach.
  4. Run periodic mutation or intentional-failure checks against ATDD step definitions.

Explanation

Correct Answer

C:

This safeguard specifically targets the contributing cause: Combine structural and business-rule coverage when selecting a test approach. It addresses the principle (White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage.) and can be assessed by: A missing legislative exception is revealed by a rule-based test despite high code coverage.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 4.1): A team chooses randomized inputs for a shipping discount before reading the discount rule, then claims it has performed systematic specification-based test design. The targeted safeguard for the current case is: Combine structural and business-rule coverage when selecting a test approach.

B:

This preventive step mitigates a different project risk (syllabus section 4.1): A team always selects decision tables for simple free-text search without constraints and reserves no method for a complex eligibility rule with multiple conditions. The targeted safeguard for the current case is: Combine structural and business-rule coverage when selecting a test approach.

D:

This preventive step mitigates a different project risk (syllabus section 4.5): A service team automates its Gherkin scenarios with step definitions that always return success regardless of the application's actual state. The targeted safeguard for the current case is: Combine structural and business-rule coverage when selecting a test approach.

Question 457

A software testing team encounters the following project situation: A tester relies on a checklist of historic outages and misses a newly required age boundary in a registration feature. Which testing activity or corrective action best addresses this situation?

  1. Measure separately which requirement conditions and structural items are exercised by the tests.
  2. Match test techniques to the work product: suitable partitions for search and decision tables for the eligibility logic.
  3. Refresh suspected fault patterns using the changed architecture and current threat model.
  4. Add systematic specification-derived boundary cases while retaining useful experience-based checks.

Explanation

Correct Answer

D:

The targeted action is: Add systematic specification-derived boundary cases while retaining useful experience-based checks. It addresses the underlying software-testing principle: Experience-based testing complements but does not replace structured black-box techniques. The relevant confirming evidence is: The suite includes newly specified age limits plus failure patterns from previous releases.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 4.1, Test Techniques Overview): A team treats automated test-count growth as proof that it has covered every requirement and structural path. The present problem instead depends on: Experience-based testing complements but does not replace structured black-box techniques.

B:

This choice is a useful response to a different testing situation (section 4.1, Test Techniques Overview): A team always selects decision tables for simple free-text search without constraints and reserves no method for a complex eligibility rule with multiple conditions. The present problem instead depends on: Experience-based testing complements but does not replace structured black-box techniques.

C:

This choice is a useful response to a different testing situation (section 4.4, Experience-based Test Techniques): An API tester writes an error-guessing list from a five-year-old version and never considers new authentication tokens introduced in the current release. The present problem instead depends on: Experience-based testing complements but does not replace structured black-box techniques.

Question 458

A software testing team encounters the following project situation: A tester relies on a checklist of historic outages and misses a newly required age boundary in a registration feature. Which observation best verifies that the stated testing issue is addressed?

  1. A coverage report reveals one untested requirement and an uncovered conditional outcome despite hundreds of scripts.
  2. The eligibility cases cover relevant combinations and the search uses representative text classes.
  3. The suite includes newly specified age limits plus failure patterns from previous releases.
  4. Two cancellation scenarios lead to their respective documented payment outcomes.

Explanation

Correct Answer

C:

This is the expected verification outcome: The suite includes newly specified age limits plus failure patterns from previous releases. It directly checks the corrective activity (Add systematic specification-derived boundary cases while retaining useful experience-based checks.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: A team treats automated test-count growth as proof that it has covered every requirement and structural path. It does not establish the required result for this case: The suite includes newly specified age limits plus failure patterns from previous releases.

B:

This result may validate another testing scenario: A team always selects decision tables for simple free-text search without constraints and reserves no method for a complex eligibility rule with multiple conditions. It does not establish the required result for this case: The suite includes newly specified age limits plus failure patterns from previous releases.

D:

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: The suite includes newly specified age limits plus failure patterns from previous releases.

Question 459

A software testing team encounters the following project situation: A tester relies on a checklist of historic outages and misses a newly required age boundary in a registration feature. Which testing concept or underlying cause best explains the reported problem?

  1. Experience-based testing complements but does not replace structured black-box techniques.
  2. Black-box techniques derive tests from the specified behavior without needing code structure.
  3. White-box techniques evaluate implementation structure and cannot establish unimplemented requirement coverage.
  4. Executable acceptance specifications require real observable checks, not green steps with no oracle.

Explanation

Correct Answer

A:

The most relevant explanation is: Experience-based testing complements but does not replace structured black-box techniques. This describes why the original situation (A tester relies on a checklist of historic outages and misses a newly required age boundary in a registration feature.) merits the response: Add systematic specification-derived boundary cases while retaining useful experience-based checks.

Incorrect Answers

B:

This principle could explain a different testing issue: A team chooses randomized inputs for a shipping discount before reading the discount rule, then claims it has performed systematic specification-based test design. The present case is better explained by: Experience-based testing complements but does not replace structured black-box techniques.

C:

This principle could explain a different testing issue: A programmer obtains statement coverage for an unfamiliar tax module but declares that the work proves the legal requirements are complete. The present case is better explained by: Experience-based testing complements but does not replace structured black-box techniques.

D:

This principle could explain a different testing issue: A service team automates its Gherkin scenarios with step definitions that always return success regardless of the application's actual state. The present case is better explained by: Experience-based testing complements but does not replace structured black-box techniques.

Question 460

A software testing team encounters the following project situation: A tester relies on a checklist of historic outages and misses a newly required age boundary in a registration feature. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Report denominators and coverage measures appropriate to the technique.
  2. Combine structural and business-rule coverage when selecting a test approach.
  3. Combine fresh requirements analysis with historical defect lessons.
  4. Include benefit and target persona in collaborative story refinement.

Explanation

Correct Answer

C:

This safeguard specifically targets the contributing cause: Combine fresh requirements analysis with historical defect lessons. It addresses the principle (Experience-based testing complements but does not replace structured black-box techniques.) and can be assessed by: The suite includes newly specified age limits plus failure patterns from previous releases.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 4.1): A team treats automated test-count growth as proof that it has covered every requirement and structural path. The targeted safeguard for the current case is: Combine fresh requirements analysis with historical defect lessons.

B:

This preventive step mitigates a different project risk (syllabus section 4.1): A programmer obtains statement coverage for an unfamiliar tax module but declares that the work proves the legal requirements are complete. The targeted safeguard for the current case is: Combine fresh requirements analysis with historical defect lessons.

D:

This preventive step mitigates a different project risk (syllabus section 4.5): A shipping team's testers receive a story with the words 'As a user' but no actual business benefit, leading to tests that optimize a technically valid but irrelevant feature. The targeted safeguard for the current case is: Combine fresh requirements analysis with historical defect lessons.