Behavior Driven Development

by Aliaksandr Ikhelis, 2013 @Expedia.comSunday, 10 March 13

• BDD

• Development workflow

• Testing quadrants (types of tests)

• Testing Pyramid

• Stubbing in Functional Tests

• Continuous Integration

Agenda

Sunday, 10 March 13

Communication Issue

They are slow!..

They do not know what they need!..

Sunday, 10 March 13

Communication Issue

They are slow!..

They do not know what they need!..

Sunday, 10 March 13

Building communication bridge

Sunday, 10 March 13

Building communication bridge

Sunday, 10 March 13

Behavior Driven Development

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

Sunday, 10 March 13

Behavior Driven DevelopmentPractices

Sunday, 10 March 13

Behavior Driven DevelopmentPractices

• Establish goals

Sunday, 10 March 13

Behavior Driven DevelopmentPractices

• Establish goals

• Draw out features using feature injection

Sunday, 10 March 13

Behavior Driven DevelopmentPractices

• Establish goals

• Draw out features using feature injection

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

Sunday, 10 March 13

Behavior Driven DevelopmentPractices

• Establish goals

• Draw out features using feature injection

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

• Use examples to describe behavior

Sunday, 10 March 13

Behavior Driven DevelopmentPractices

• Establish goals

• Draw out features using feature injection

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

• Automate examples to provide quick feedback and regression testing

• Use examples to describe behavior

Sunday, 10 March 13

What BDD adds to TDD

Sunday, 10 March 13

What BDD adds to TDD

• Test what an object does instead of what it is

Sunday, 10 March 13

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

Sunday, 10 March 13

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

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

Sunday, 10 March 13

The BDD “Outside-In” cycle

Sunday, 10 March 13

The BDD “Outside-In” cycle

Sunday, 10 March 13

Gherkin: feature title and narrative

Feature: Adding movies to the queue

Sunday, 10 March 13

Gherkin: feature title and narrative

Feature: Adding movies to the queue

Sunday, 10 March 13

Gherkin: feature title and narrative

Feature: Adding movies to the queue

Sunday, 10 March 13

Gherkin: feature title and narrative

Feature: Adding movies to the queue

Sunday, 10 March 13

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.

Sunday, 10 March 13

© 2012 Expedia, Inc..

Cucumber step definitions

Sunday, 10 March 13

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.

Code example: Output:

Sunday, 10 March 13

Describing code with RSpecDescribing code with RSpec

Sunday, 10 March 13

Example: process flow

Sunday, 10 March 13

Example: story card

Sunday, 10 March 13

Describing code with RSpecDescribing code with RSpec

Sunday, 10 March 13

Benefits

• Communication

• Living Documentation

• Traceability

• Focus on behavior

Sunday, 10 March 13

Sunday, 10 March 13

Testing quadrands

Sunday, 10 March 13

AFTERBEFORE

Get the testing pyramid (un)fit

Sunday, 10 March 13

© 2012 Expedia, Inc..

Stubbing services/back-ends

Sunday, 10 March 13

© 2012 Expedia, Inc..

• Spoofing the service (replicate behavior with mocked backend + store data)

• Prepared canned responses

• Stubbing per browser session

Stubbing services/back-ends

Sunday, 10 March 13

© 2012 Expedia, Inc..

Stage 1 Stage 2 Stage 3- Compile - Deploy - Stub - Package - isWorking acceptance- Unit tests - Stub- PMD (static analysis) integration

Jenkins: trunk pipeline

Sunday, 10 March 13

© 2012 Expedia, Inc..

Jenkins: trunk pipeline

Sunday, 10 March 13

© 2012 Expedia, Inc..

•Start small

•Keep it fast – set a limit

•Fail Fast

•Keep it green

•Everyone is responsible for Quality

•Pre-checkin Ant Targets

CI tips

Sunday, 10 March 13

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 Solit Conference Tower is visible to all people across the Globe

Sunday, 10 March 13

Do not forget to Have Fun!

Sunday, 10 March 13

• alex.ikhelis@gmail.com• www.linkedin.com/in/aikhelis/

Sunday, 10 March 13

Recommended reading

by Aliaksandr Ikhelis, 2013Sunday, 10 March 13