O'Reilly logo

Test-Driven Java Development - Second Edition by Viktor Farcic, Alex Garcia

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Unit testing with TDD

What is the difference in the way we write unit tests in the context of TDD? The major differentiator is in when. While traditionally unit tests are written after the implementation code is done, in TDD we write tests before—the order of things is inverted. Without TDD, the purpose of unit tests is to validate an existing code. TDD teaches us that unit tests should drive our development and design. They should define the behavior of the smallest possible unit. They are micro-requirements pending development. A test tells you what to do next and when you're done doing it. Depending on the type of tests (unit, functional, integration, and so on), the scope of what should be done next differs. In the case of TDD with unit ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required