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ISTQB CTAL-TTA Exam - Topic 1 Question 51 Discussion

A unit test should be deterministic. Which option correctly describes the meaning of 'deterministic' as a characteristic of a unit test9SELECT ONE OPTION
B) Whenever it is run under the same conditions, it should produce the same results.
A) It should be small so that many tests can be run in a short period of time
C) it should not depend on any other test.
D) It should only test the functionality related to it.

ISTQB CTAL-TTA Exam - Topic 1 Question 51 Discussion

Actual exam question for ISTQB's CTAL-TTA exam
Question #: 51
Topic #: 1
[All CTAL-TTA Questions]

A unit test should be deterministic. Which option correctly describes the meaning of 'deterministic' as a characteristic of a unit test9

SELECT ONE OPTION

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Suggested Answer: B

A unit test being 'deterministic' means that whenever it is run under the same conditions, it should produce the same results. This characteristic is crucial for reliable, repeatable testing outcomes that are not influenced by external factors or previous test states .


by Ethan at May 27, 2026, 02:48 AM

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Ernest
I know that a unit test shouldn't rely on others, but I don't think that's what 'deterministic' means. I might need to double-check my notes on this.
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Dana
5 days ago
I practiced a similar question last week, and I think it was about consistency in test results. That makes me lean towards option B again.
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Tran
10 days ago
I'm a bit unsure about this one. I feel like all the options touch on important aspects of unit tests, but I can't quite recall which one specifically defines 'deterministic.'
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Viola
15 days ago
I remember discussing how a deterministic test should always give the same output if the input and environment are unchanged. So, I think option B makes sense.
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