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Beginner Topic 14 of 50 Software Engineering

Test-Driven Development

Writing failing tests before the code that satisfies them.

How it works

TDD cycles Red (write a failing test), Green (make it pass minimally), Refactor (clean up). It drives design toward testable, decoupled code.

Where it is used

Library and domain logic.

Common pitfall

Writing tests after the fact tends to test what the code does, not what it should do.

Where it fits in the course

Test-Driven Development is topic 14 of 50 in Software Engineering, rated Beginner. It follows Integration Testing. The next topic is Software Documentation.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Software Engineering quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Test-Driven Development?
Writing failing tests before the code that satisfies them. It belongs to Software Engineering and is a beginner-level topic.
Where do people use Test-Driven Development?
Library and domain logic.
What is the most common mistake with Test-Driven Development?
Writing tests after the fact tends to test what the code does, not what it should do.
What should I learn before this topic?
Start with Integration Testing, the topic just before it in Software Engineering.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Software Engineering quiz.
Is Test-Driven Development hard to learn?
It is a Beginner topic, so it works as an entry point. If the terms are new, read the explanation twice and try the visualizer before the quiz.
How long does it take to learn Test-Driven Development?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Test-Driven Development?
Integration Testing, Software Documentation, Unit Testing are closely connected. The full list is in the related topics section of this page.
What should I study after Test-Driven Development?
Continue with Software Documentation, the next topic in Software Engineering.

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