Bdd intro for Microsoft, 29 Nov 2012

Behavior Driven Development

by Aliaksandr Ikhelis, 2012Friday, 30 November 12

Communication Issue

They are slow!..

They do not know what they need!..

Friday, 30 November 12

Communication Issue

They are slow!..

They do not know what they need!..


Building communication bridge


Building communication bridge





BDD is an evolution in the thinking behind TDD & ATDP



BDD is an evolution in the thinking behind TDD & ATDP

Focus on delivery of the prioritized and verifiable business value

by providing a common vocabulary


Behavior Driven DevelopmentPractices



• Establish goals



• Establish goals

• Draw out features using feature injection



• Establish goals


• Involve stakeholders in the implementation process through outside-in software development



• Establish goals



• Use examples to describe behavior



• Establish goals



• Automate examples to provide quick feedback and regression testing

• Use examples to describe behavior


What BDD adds to TDD



• Test what an object does instead of what it is




• Design top-down, which is essential for YAGNI – You Aren't Gonna Need It


http://en.wikipedia.org/wiki/You_ain't_gonna_need_it




• Design top-down, which is essential for YAGNI – You Aren't Gonna Need It

• Define acceptance criteria with the customer and specify it in the automated way, serve the living spec




The BDD “Outside-In” cycle


The BDD “Outside-In” cycle


Gherkin: feature title and narrative

Feature: Adding movies to the queue











Describing Features with Cucumber



Cucumber is a BDD tool that reads plain text descriptions of application features with example scenarios, which can be converted into automation. The text is written in a business readable domain language, known as Gherkin.



Cucumber is a BDD tool that reads plain text descriptions of application features with example scenarios, which can be converted into automation. The text is written in a business readable domain language, known as Gherkin.


Describing code with RSpec



RSpec is a BDD framework, which is used to write executable examples of the expected behaviour of a small bit of code in a controlled context.



RSpec is a BDD framework, which is used to write executable examples of the expected behaviour of a small bit of code in a controlled context.

Code example: Output:


Describing code with RSpecDescribing code with RSpec


Example: story card


Example: process flow


Describing code with RSpecDescribing code with RSpec


Testing quadrands


AFTERBEFORE

Get the testing pyramid (un)fit


Communications in the business org



1. Translate business goals into prioritized list of features




2. Trace required behavior within the team - drive design by behavior, build transparency, trust and confidence.




2. Trace required behavior within the team - drive design by behavior, build transparency, trust and confidence.

3. Clarify business value and desired software behavior - ask “5 Why”, provide feedback, if application logic appears overcomplicated.


Speaking the same language = building together

As an awesome teamWe want to build such a great productSo that everyone loves it

Given the investment of 22M of bricks When you place all the bricks properly Then the Microsoft Tower of Babel is visible to all people across the Globe


Recommended reading

by Aliaksandr Ikhelis, 2012Friday, 30 November 12

Technology

Bdd intro for Microsoft, 29 Nov 2012