BDD
What is BDD?
Behavior-Driven Development (BDD) is a software development methodology that extends Test-Driven Development (TDD) by emphasizing collaboration between developers, testers, and business stakeholders. BDD focuses on defining the behavior of software in terms of user stories and acceptance criteria, written in a natural language that all stakeholders can understand.
Key Principles of BDD
Collaboration: Involves close cooperation between developers, testers, and business stakeholders to ensure a shared understanding of requirements.
User Stories: Requirements are expressed as user stories, which describe the desired behavior of the system from the user's perspective.
Acceptance Criteria: Each user story includes acceptance criteria that define the conditions under which the story is considered complete.
Executable Specifications: Acceptance criteria are written in a way that they can be turned into automated tests.
BDD Process
Discovery: Collaborate with stakeholders to understand the requirements and define user stories.
Formulation: Write acceptance criteria for each user story using a structured format such as Given-When-Then.
Automation: Implement automated tests based on the acceptance criteria.
Development: Write the code to make the tests pass.
Verification: Run the automated tests to verify that the code meets the acceptance criteria.
Example of BDD Scenario
User Story
As a user, I want to be able to log in to the application so that I can access my account.
Acceptance Criteria
Given the user is on the login page
When the user enters valid credentials
Then the user should be redirected to the dashboard
Example in Gherkin Syntax
Conclusion
BDD is a powerful methodology that enhances collaboration and ensures that software meets the needs of its users. By focusing on user stories and acceptance criteria, BDD helps create a shared understanding of requirements and produces high-quality, maintainable software.