Behaviour Driven Development

using Behat

Isn’t it obvious…???

○ What test should I write next?

○ How do I know when I’ve written the last test?

○ Am I writing the right code?

“”

If you can't explain it simply, you don't understand it well enough

!Albert Einstein

○ Write Human-readable stories that describe the behaviour of your application

○ Focuses the communication between the business and the developers

○ Code is self documenting

○ Code is easier to maintain

Why BDD?

INSTALL

○ Composer○ PHAR○ GIT

BEHAT

INIT

○ mkdir Calculator

○ cd Calculator

○ behat --init

./features /bootstrap FeatureContext.php

Gherkins

The Basics

Feature - Gherkins

# features/BananaCalculator.features

# Describe the business value of this feature

Feature: Banana Calculator

As Bob the Banana merchant,I want a calculator that can add the amount of bananasso that I can know how many bananas I currently have

# features/BananaCalculator.features

# Describe the business rules with scenarios

Scenario: Will add 2 banana amounts

Scenario - Gherkins

# features/BananaCalculator.features

# Describe the steps

Given I have 3 Bananas

When I add 5 Bananas

Then I should have 8 Banana

Steps - Gherkins

Feature: Banana CalculatorAs Bob the Banana merchant,I want a calculator that can add the amount of bananasso that I can know how many bananas I currently haveScenario: Will add 2 banana amounts Given I have 3 Bananas When I add 5 Bananas Then I should have 8 Banana

Example

Scenario Outline

Passing Parameters and Tagging

@BeforeSuite

Managing Sub-Context

○ Context files can get really big really fast○ Certain steps are repeated across multiple Feature files

Mink

test in browser

Mink

In order to test, that our web application behaves correctly, we need a way to simulate this interaction between browser and web application in our tests

Mink is an open source acceptance test framework for web applications

Goutte

○ Headless Browser○ No JS support○ Good for testing REST API

java -jar selenium-server-standalone.jarjava -jar selenium-server-standalone.jar -Dwebdriver.chrome.driver="/usr/local/bin/chromedriver"

Selenium

○ JS Support

○ Can run multiple browser

○ Need to start Selenium RC

○ Not Headless

○ Need to load Drivers for different browsers

○ Doesn’t play nice at times

Sahi

○ JS Support (kinda)○ Can run Multiple browsers○ Need to setup localhost proxy

in browser○ Not headless○ Issues with Ajax Request

PhantomJS

○ JS Support○ Headless browser○ Pure Awesomeness!phantomjs --webdriver=8643

DEMO

BDD Anti-Patterns

just don’t

When i fill in 'input.flooble-widgets[:first]' with 'FooBar'

○ Write BDD in the domain language

○ You should never see any DOM elements

Anti-pattern

When I subscribe to the newsletter

rather than And I set the value of 'input#newsletter-signup-checkbox' to '1'

and When I search for articles containing the words 'rockets'

rather than When I fill in 'input#search-terms' with 'rockets'

And I click 'button#search-button'

And I wait 10 seconds

○ This is not a requirement

○ Roll up the execution into the page element

public function search($keywords) { $searchForm = $this->find('css', 'form#search'); if (!$searchForm) { throw new ElementNotFoundException($this->getSession(), 'form', 'css', 'form#search'); } $searchForm->fillField('q', $keywords); $searchForm->pressButton('Google Search'); return $this->getPage('Search results'); }

Try this

IN CONCLUSION

BDD & TDD = BFF

Thank you