Test driven development is a particular approach to writing code where the tests are written at the same time as the code and involves constant refactoring. Because of its association with XP, TDD is historically associated with the unit test level. However, it is possible to apply it at other levels of testing (such as functional E2E level testing).
TDD tools are traditionally unit testing and mocking tools such as
Behaviour Driven Development can be seen as an extension of TDD. The key enhancement with BDD is the introduction of a domain specific language that is very accesible to business users. BDD will typically be more at the functional test level as that is natural outcome of working with a business focused language.
The most commonly used BDD tool by far is Cucumber.
With acceptance test driven development the focus is verifying work is done by passing acceptance tests. As it is dealing with acceptance tests it will usually be at the functional test level. ATDD is close in concept to BDD, but with a stronger focus on the testing aspect as validation. It would be perfectly possible to do BDD in a way that was compliant with ATDD or to do ATDD in a way that was compliant with BDD.
ATDD tools would include Cucumber and Fitnesse.
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