Test first strategies

Differences

Acceptance Test-Driven Development is very similar to Behavioral-Driven Development. However, a key difference between them is: BDD focuses more on the behavior of the feature, whereas ATDD focuses on capturing the accurate requirements.
ATDD is a technique used WITHIN BDD. They are not one and the same.

Parameters

TDD

BDD

ATDD

Definition

TDD is a development technique that focuses more on the implementation of a feature

BDD is a development technique that focuses on the system’s behavior

ATDD is a technique similar to BDD focusing more on capturing the requirements

Participants

Developer

Developers, Customer, QAs

Language used

Written in a language similar to the one used for feature development (Eg. Java, Python, etc)

Simple English using domain terminology

Main Focus

Unit Tests

Understanding Requirements

Writing Acceptance Tests

Tools

junit

Gherkin, Dave, Cucumber, JBehave, Spec Flow, BeanSpec, Concordian, yatspec

TestNG, FitNesse, EasyB, Spectacular, Concordian, Thucydides, yatspec