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TDD and Multithreaded Programs

publish date: 2026/06/19 10:09:33.831821 UTC

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TDD has a significant limitation when applied to multithreaded programs. What is this limitation?

TDD frameworks block the creation of multiple threads during testing

Tests for multithreaded programs are inherently non-deterministic because thread scheduling can vary, making defects difficult to reproduce consistently

Multithreaded programs require hardware testing rigs that TDD cannot interface with

Multithreaded programs cannot be written in languages supported by TDD frameworks

Correct Answer

Tests for multithreaded programs are inherently non-deterministic because thread scheduling can vary, making defects difficult to reproduce consistently

Explanation

TDD is difficult to apply to multithreaded programs because tests may be non-deterministic - the behavior depends on how threads are scheduled, which can vary between runs. Defects may appear and disappear depending on thread interleaving, making it hard to write tests that reliably expose these defects and confirm they are fixed.

Reference

Software Engineering, Ian Sommerville, 10th edition

Quizzes you can take where this question appears

Test-Driven Development - Limitations and Context