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Question 3 - CTFL-2018 discussion

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In a system designed to work out the employee tax to be paid:

_ An employee has $4,000 of salary tax free.

_ The next $1,500 is taxed at 10%.

_ The next $28,000 after that is taxed at 22%.

_ Any further amount is taxed at 40%.

Which of these is a valid Boundary Value Analysis test case?

A.
$28,000
Answers
A.
$28,000
B.
$1,500
Answers
B.
$1,500
C.
$33,501
Answers
C.
$33,501
D.
$5,000
Answers
D.
$5,000
Suggested answer: C

Explanation:

Boundary Value Analysis is a black-box testing technique that is used to test the boundaries or limits of input or output values for a given system or component. Boundary Value Analysis helps to identify errors at the edges of an input or output domain. For example, in a system designed to work out the employee tax to be paid, there are four boundaries for the salary input: $4,000 (lower boundary for tax free), $5,500 (upper boundary for tax free and lower boundary for 10% tax), $34,000 (upper boundary for 10% tax and lower boundary for 22% tax), and any value above $34,000 (upper boundary for 22% tax and lower boundary for 40% tax). A valid Boundary Value Analysis test case would test one value below, on, and above each boundary. For example, $33,501 is a valid test case because it is one value above the boundary of $34,000. A detailed explanation of Boundary Value Analysis can be found in [A Study Guide to the ISTQB Foundation Level 2018 Syllabus], pages 38-41.

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asked 18/09/2024
Tyler Henderson
35 questions
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