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BCS CTFL4 Prüfungsplan:

Thema	Einzelheiten
Thema 1	Test Analysis and Design: It focuses on black-box and the collaboration-based test approach.
Thema 2	Managing the Test Activities: This topic explains how to plan tests in general, monitor and control test activities, and report defects in a clear and understandable way.
Thema 3	Testing Throughout the Software Development Lifecycle: This topic explains how testing is incorporated into different development approaches. It also focuses on the concepts of test-first approaches.
Thema 4	Static Testing: The topic covers static testing basics, the feedback and review process.

BCS ISTQB Certified Tester Foundation Level CTFL 4.0 CTFL4 Prüfungsfragen mit Lösungen (Q64-Q69):

64. Frage
A program is used to control a manufacturing line (turn machines on and off. start and stop conveyer belts, add raw materials to the flow. etc.). Not all actions are possible at all times. For example, there are certain manufacturing stages that cannot be stopped - unless there is an emergency. A tester attempts to evaluate if all such cases (where a specific action is not allowed) are covered by the tests.
Which coverage metric will provide the needed information for this analysis?

A. Data flow coverage
B. Code coverage
C. Statement coverage
D. Branch Coverage

Antwort: D

Begründung:
Branch coverage is a type of structural coverage metric that measures the percentage of branches or decision outcomes that are executed by the test cases. A branch is a point in the code where the control flow can take two or more alternative paths based on a condition. For example, an if-else statement is a branch that can execute either the if-block or the else-block depending on the evaluation of the condition. Branch coverage ensures that each branch is taken at least once by the test cases, and thus reveals the behavior of the software under different scenarios. Branch coverage is also known as decision coverage or all-edges coverage.
Branch coverage is suitable for testing the cases where a specific action is not allowed, because it can verify that the test cases cover all the possible outcomes of the conditions that determine the action. For example, if the program has a condition that checks if the manufacturing stage can be stopped, then branch coverage can ensure that the test cases cover both the cases where the stage can be stopped and where it cannot be stopped. This way, branch coverage can help identify any missing or incorrect branches that may lead to undesired or unsafe actions.
The other options are not correct because they are not suitable for testing the cases where a specific action is not allowed. Code coverage is a general term that encompasses various types of coverage metrics, such as statement coverage, branch coverage, data flow coverage, etc. Code coverage does not specify which type of coverage metric is used for the analysis. Data flow coverage is a type of structural coverage metric that measures the percentage of data flow paths that are executed by the test cases. A data flow path is a sequence of statements that define, use, or kill a variable. Data flow coverage is useful for testing the correctness and completeness of the data manipulation in the software, but not for testing the conditions that determine the actions. Statement coverage is a type of structural coverage metric that measures the percentage of statements or lines of code that are executed by the test cases. Statement coverage ensures that each statement is executed at least once by the test cases, but it does not reveal the behavior of the software under different scenarios. Statement coverage is a weaker criterion than branch coverage, because it does not account for the branches or decision outcomes in the code. Reference = ISTQB Certified Tester Foundation Level (CTFL) v4.0 syllabus, Chapter 4: Test Techniques, Section 4.3: Structural Testing Techniques, Pages 51-54.

65. Frage
Which ONE of the following options explains a benefit of independent testing the BEST?

A. Independent testers may lack information regarding the test object.
B. Developers may lose a sense of responsibility for the quality of the product they develop.
C. Independent testers are likely to recognize different types of failures compared to developers.
D. The testers can be isolated from the development team and thus avoid acquiring the same bias as the developers.

Antwort: C

Begründung:
Comprehensive and Detailed In-Depth Explanation:Independent testers provide a fresh perspective and are more likely to identify failures that developers might overlook due to their familiarity with the software (C). Independent testing helps avoid cognitive biases, improves defect detection, and enhances the overall quality assurance process. While A and D touch on related concepts, they do not directly define the benefit as well as C does. Option B highlights a potential challenge rather than a benefit.

66. Frage
Which of the following statements about branch coverage is true?

A. If full branch coverage has been achieved, then all combinations of conditions in a decision table have surely been exercised
B. Exercising at least one of the decision outcomes for all decisions within the code, ensures achieving full branch coverage
C. The minimum number of test cases needed to achieve full branch coverage, is usually lower than that needed to achieve full statement coverage
D. If full branch coverage has been achieved, then all unconditional branches within the code have surely been exercised

Antwort: B

Begründung:
Exercising at least one of the decision outcomes for all decisions within the code, ensures achieving full branch coverage, which is a test coverage criterion that requires that all branches in the control flow of the code are executed at least once by the test cases. A branch is a basic block of code that has a single entry point and a single exit point, and a decision is a point in the code where the control flow can take more than one direction, such as an if-then-else statement, a switch-case statement, a loop statement, etc. The decision outcomes are the possible paths that can be taken from a decision, such as the then branch or the else branch, the case branch or the default branch, the loop body or the loop exit, etc. The other statements are false, because:
The minimum number of test cases needed to achieve full branch coverage, is usually higher than that needed to achieve full statement coverage, which is a test coverage criterion that requires that all executable statements in the code are executed at least once by the test cases. This is because branch coverage is a stronger criterion than statement coverage, as it implies statement coverage, but not vice versa. For example, a single test case can achieve full statement coverage for an if-then-else statement, but two test cases are needed to achieve full branch coverage, as both the then branch and the else branch need to be exercised.
If full branch coverage has been achieved, then all unconditional branches within the code have not necessarily been exercised, as unconditional branches are branches that do not depend on any decision, and are always executed, such as a goto statement, a break statement, a return statement, etc. Unconditional branches are not part of the branch coverage criterion, as they do not represent different paths in the control flow of the code. However, they are part of the statement coverage criterion, as they are executable statements in the code.
If full branch coverage has been achieved, then all combinations of conditions in a decision table have not necessarily been exercised, as a decision table is a test design technique that represents the logical relationships between multiple conditions and their corresponding actions, in a tabular format. A decision table can have more combinations of conditions than the number of decision outcomes in the code, as each condition can have two or more possible values, such as true or false, yes or no, etc. For example, a decision table with four conditions can have 16 combinations of conditions, but the corresponding code may have only two decision outcomes, such as pass or fail. To exercise all combinations of conditions in a decision table, a stronger test coverage criterion is needed, such as condition combination coverage, which requires that all possible combinations of condition outcomes in the code are executed at least once by the test cases. Reference: ISTQB Certified Tester Foundation Level (CTFL) v4.0 sources and documents:
ISTQB Certified Tester Foundation Level Syllabus v4.0, Chapter 2.3.1, Test Coverage Criteria Based on the Structure of the Software ISTQB Glossary of Testing Terms v4.0, Branch Coverage, Statement Coverage, Branch, Decision, Decision Outcome, Unconditional Branch, Decision Table, Condition Combination Coverage

67. Frage
A possible risk of introducing test automation is:

A. the tool may not be fit-for-purpose.
B. the tool may not be compatible with the development platform.
C. the tool may create additional development dependencies.
D. the tool will be owned and maintained by developers and replace testers.

Antwort: A

Begründung:
One possible risk of introducing test automation is that the selected tool may not be fit-for-purpose. This means that the tool might not meet the specific needs and requirements of the project, leading to inefficiencies and possibly failing to provide the expected benefits. It is crucial to evaluate and select the appropriate tool based on the project's context and objectives. The ISTQB CTFL syllabus highlights the importance of careful tool evaluation and selection to ensure it aligns with the testing goals and the development environment.
References:ISTQB CTFL Syllabus, Section 6.2, "Potential Benefits and Risks of Test Automation."

68. Frage
Consider the following simplified version of a state transition diagram that specifies the behavior of a video poker game:

What Is the minimum number of test cases needed to cover every unique sequence of up to 3 states/2 transitions starting In the "Start" state and ending In the "End" state?

A. 0
B. 1
C. 2
D. 3

Antwort: C

Begründung:
The minimum number of test cases needed to cover every unique sequence of up to 3 states/2 transitions starting in the "Start" state and ending in the "End" state is 4. This is because there are 4 unique sequences of up to 3 states/2 transitions starting in the "Start" state and ending in the "End" state:
Start -> Bet -> End
Start -> Deal -> End
Start -> 1st Deal -> End
Start -> 2nd Deal -> End Reference: ISTQB Certified Tester Foundation Level (CTFL) v4.0 sources and documents.

69. Frage
......

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BCS CTFL4 Prüfungsübungen & CTFL4 Fragen Beantworten

BCS CTFL4 Prüfungsplan:

BCS ISTQB Certified Tester Foundation Level CTFL 4.0 CTFL4 Prüfungsfragen mit Lösungen (Q64-Q69):

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