Behaviour-driven development is an agile technique, encouraging collaboration with customers, testers, and developers.
It helps you think about what you're creating, before development starts - when change is least expensive.
Swanson is a BDD test runner, designed for Django. It takes specs in plain-text format, and runs them with the rest of your test suite.
Given I am on the signup page And I have entered mostly valid data But the username field consists only of spaces When I try to register an account Then the username field displays a "this field is required" error message