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Sequence Testing Guideline - Single Value

publish date: 2026/06/18 03:41:33.978563 UTC

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One guideline for testing programs with sequences, arrays, or lists states: test the software with sequences that have only a single value. Why is this guideline important?

Programmers sometimes embed assumptions that sequences have multiple values, causing failures with single-value inputs

Single-value sequences are the most common type encountered in production systems

Single-value sequences are the only ones that reveal performance bottlenecks

Testing frameworks like JUnit require single-value test cases as a baseline

Correct Answer

Programmers sometimes embed assumptions that sequences have multiple values, causing failures with single-value inputs

Explanation

Programmers naturally think of sequences as made up of several values and sometimes embed this assumption in their programs. Consequently, a program may not work properly when presented with a single-value sequence. Testing with single-value sequences helps reveal these hidden assumptions.

Reference

Software Engineering, Ian Sommerville, 10th edition

Quizzes you can take where this question appears

Choosing Unit Test Cases - Guideline-Based Testing