© Ibuildings 2014/2015 - All rights reserved #DrupalDaysEU Bridging the gap between business and technology Behavior Driven Developement with Drupal by Marcin Pajdzik
Jul 16, 2015
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Bridging the gap between business and technology
Behavior Driven Developement with Drupalby Marcin Pajdzik
© Ibuildings 2014/2015 - All rights reserved
#DrupalDaysEU
Bridging the gap between business and technology
Behavior Driven Developemnt with Drupal
#DrupalDaysEU
© Ibuildings 2014/2015 - All rights reserved
How BDD works?
Write scenarios that describe behaviours
Execute the scenarios against your application
▼
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How BDD works?
Write each step of your scenario in plain English
Write each step definition in PHP
▼
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NHS - National Health Service
Project started in 2002
Project terminated in 2010
Cost: €14 400 000 000 (billion)
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NHS - National Health Service
€14.4bn would pay a salary of:
60000 nurses for 10 years in the UK
240000 nurses for 10 years in Poland
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NHS - National Health Service
Result:
IT system was not FIT for the NHS
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Why projects fail?
3. Unrealistic deadlines.
2. Insufficient resource planning.
1. Poor communication.
Source: Computing Technology Industry Association, 2007
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Source: Project Management Institute, 2013
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Software development is about delivering BUSINESS VALUE
Business value is WHAT REALLY MATTERS to the business
We find out WHAT REALLY MATTERS to the business...
… through effective communication!
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Why communication is difficult?
Two people - misunderstandings
Technical and Business people - different type of language
Typical large IT project - large team, working in a fast-evolving digital domain that no one fully understands
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The main idea behind BDD
Preventing communication gaps
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What is BDD?
Agile methodology based on Test Driven Development
Promotes communication, conversation and close collaboration between everybody in the team
Focuses on writing specification of the system behaviour
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Benefits of BDD
3. Business and behaviour first - prioritisation
1. Collaboration / Communication - same language for all
2. Quality – functional / integration / regression tests
4. Documentation
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BDD stories
Title (one line describing the story) Narrative:As a [role]I want [feature]So that [benefit] Acceptance Criteria: (presented as Scenarios)
Scenario 1: TitleGiven [context]When [event]Then [outcome] Scenario 2: ...
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BDD stories
As a userI want to loginSo that I can access my account
As a [X]I want [Y]so that [Z]
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Scenarios
Given some initial contextWhen an event occurs,Then ensure some outcomes.
Given I am on the login pageWhen I login as “jsmith” with password “secret”Then I should see my account page
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Scenarios
● It is a specification that everybody understands
● It is a documentation that everybody can refer to
● It is an automated test that can be run any time
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BDD solves TDD shortcomings
Developers want to know:
●where to start
●what to test and what not to test
●how much to test in one go
●what to call their tests
●how to understand why a test fails
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Declarative Scenario vs Imperative Scenario
Given I am on the login pageWhen I login as “john” with password “secret”
Then I should see my account page
When I go to "user/login"And I enter "john" into the field "username"
And I enter "secret" into the field "password"
And I click on the button "login"
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Drawbacks
Increases the cost of maintenance
Before doing BDD make sure that there is enough return on investment to justify it.
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BDD with Drupal
Behat - allows you to write tests in a human-readable language called Gherkin and parses it into executable test-cases
Mink - web acceptance tests, provides MinkContext with step definitions for interactions with a browser
Drupal Extension - provides Drupal specific functionality
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Drupal Extension Drivers
Blackbox Driver
Drupal API Driver
Drush Driver
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Drupal Extension Drivers
Blackbox Driver
Drupal API Driver
Drush Driver
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System Requirements
PHP 5.3.5 or higher with curl, mbstring and xmlJava required for Selenium
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Installation
{ "require": { "behat/behat": "2.4.*@stable" }, "minimum-stability": "dev", "config": { "bin-dir": "bin/" }
}
$ curl http://getcomposer.org/installer | php
$ php composer.phar install
$ bin/behat
$ mkdir ls_project$ cd ls_project
$ behat --init
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Installation
default: paths: features: 'features' extensions: Behat\MinkExtension\Extension: goutte: ~ selenium2: ~ base_url: http://seven.l Drupal\DrupalExtension\Extension: blackbox: ~
Make your FeatureContext.php aware of both the Drupal Extension and the Mink Extension
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How to make the scenarios available to everybody?
Behat Jira Extension
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Behat Jira Extension
{code:none}Feature: Jira integration In order to facilitate the authoring of Behat features by non-developers As a developer I want to write an extension to load features from Jira issues.
Scenario: Load Me! Given I am a Jira issue And I contain a Behat feature When I am loaded by JiraExtension Then I should parsed by Gherkin
{code}
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Behat Jira Extension
bin/behat jira:BDD-1
bin/behat http://jira.example.com:8080/browse/BDD-1
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BDD in business
“After the decision to move our websites onto Drupal, adopting Behavior Driven Development has been one of the best decisions
we’ve made for our organization in years.”
Paul Lomax - CTO, Dennis Publishing
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References
Dan North & Associates - http://dannorth.net/
Mink - http://mink.behat.org/
Behat - http://behat.org/
DSpeak - http://dspeak.com/drupalextension/intro.html
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Speaker InfoMarcin PajdzikWeb Technology Consultant
[email protected]_pajdzik