Test-Driven Development quiz

Test your Test-Driven Development knowledge with a free interactive quiz — 20 questions with answers and explanations. No signup needed to play.

What is a reasonable way to think about TDD's relationship to overall code quality/confidence, given that TDD produces tests as a natural byproduct of its process?

1. What is a reasonable way to think about TDD's relationship to overall code quality/confidence, given that TDD produces tests as a natural byproduct of its process?
2. Why does the "Red" step of TDD specifically require CONFIRMING that a newly-written test actually fails, rather than just writing the test and moving on to implementation immediately?
3. What is a "spike" (as sometimes used alongside, or as an alternative to, strict TDD) in software development practice?
4. What is "Behavior-Driven Development" (BDD), and how does it relate to (and extend) the core ideas behind TDD?
5. What is a reasonable practical criterion some teams use for deciding which specific parts of a codebase most benefit from strict TDD discipline, versus parts where a more relaxed testing approach might be acceptable?
6. What is a general reason writing a test BEFORE implementation (TDD) might help a developer more precisely clarify their own understanding of a piece of functionality's expected behavior, compared to writing the implementation first and the test afterward?
7. What is a reasonable overall summary of TDD's core value proposition, synthesizing its test-first ordering, its influence on design, and its role in enabling safe refactoring?
8. What is a "unit test" in the specific context most commonly associated with TDD's Red-Green-Refactor cycle, and why is TDD typically discussed primarily in terms of fast, narrowly-scoped unit tests rather than slower, broader integration/end-to-end tests?
9. What is the purpose of the "Refactor" step in TDD, and why is it considered safe to perform specifically at this point in the cycle (with a passing test already in place)?
10. What is a general criticism or limitation sometimes raised about strict, universal TDD adoption — situations where writing a test BEFORE any implementation might be difficult or less practical?
11. What is a general reason TDD's emphasis on writing "just enough" test and implementation code in each small cycle (rather than trying to design/implement a large, complete feature all at once) reflects a broader theme also seen in Agile methodology's emphasis on small, incremental delivery?
12. What is a commonly cited benefit of TDD's test-first approach for actually INFLUENCING/improving a piece of code's eventual design, beyond simply producing test coverage?

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