Getting started with Acceptance Test-Driven Development

Transcription

1 Getting started with Acceptance Test-Driven Development Or flipping Ice Cream Cones to make Volcanoes

2 Acknowledgements This is a very early work in progress for a class on ATDD that I am developing. So please understand that presentation is far from being complete. The information has been heavily influence by study/education/readings of Elisabeth Hendrickson, George Dinwiddie, David Hussman, David Chelimsky, Matt Wynne and numerous conversations with members at the Chicago Agile Open Space meet-up. Some images in this presentation are copyrighted and information pertaining to the holder of such rights remain intact with the images. Bill Allen Software Developer agile Coach/Instructor/Evangelist code examples available on:

3 A typical pattern seen in many organizations for software development Requirements Code Test

4 Develop from the Outside In Save implementation details for last Code Unit Tests via TDD Acceptance Tests Features and Acceptance Criteria Business Goals

5 C o d e Unit Tests via TDD Acceptance Tests B u s i n e s s F a c i n g! Written by developer art-deploy.net Serves as a design tool for verification of the specification Written by test automation Serves as a validation tool for the Business Sponsor F a c i n g!

6 Whole team benefits from creating user stories and capturing examples of user expectations of the systems behavior; in advance of code being written.

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8 Goal: Build a user authentication system for our web site. To Do: Requirements, identify field attributes, discuss Acceptance Criteria.

9 Feature: new users can register! In order to gain access to the site! As a new user! I want to register with my details! Ask the Product Owner for examples of how this feature should behave! (Acceptance Criteria)! Discuss Distill

10 Feature: new users can register! Feature: new users can register! In order to gain access to the site! As a new user! I want to register with my details! Ask the Product Owner about examples of how this feature should behave! (Acceptance Criteria)! In order to gain access to the site! As a new user! I want to register with my details! Notes: secure passwords must consist of string of at least 8 characters with at least one letter, one number and one symbol! Scenario: new user registration where password doesn't match confirmation password! Given I am on the New User Registration page! When I submit registration details with incorrect password confirmation! Then I land on the New User Registration page with the message 'Password doesn't match confirmation! Discuss Distill (Acceptance Test)!

11 Live Demo: Run the Acceptance Tests We utilize information from a failing test to drive development forward.

12 ATDD in review 1. Develop from the Outside in - Save implementation details for last 2. Discuss, Distill, Develop and Demo 3. Analyst can now deliver requirements that can easily become executable specifications, using Gherkin (domain specific language) 4. Let information from failing tests drive development 5. Acceptance Test enable you to easily specify and document the end-to-end behavior of an application. 6. The end product is quality test coverage: Unit and Integration 7. Acceptance tests can roll-up into a Regression suite.

13 And that s how to flip ice cream cones to make volcanoes!

14 Q & A