Uszanowanko Programowanko #4 - BDD vs Behat

tekst

BDD vs BehatPaweł Skotnicki

About me

PHP developer @ The Software House

PHPers Silesia co-organizer

BDD/DDD enthusiast

BDD

Behaviour Driven Development

Dan North, 2003

BDD is like TDD without world „test”

examples in ubiquitous language

using those examples as the basis of automated tests

BDD main parts

Scenarios

writing down is NOT most important part

conversation

Behat

an open source BDD framework for PHP

Gherkin language

Given, When, Then

Behat !== BDD

BDD = scenarios + automation

Behat = automation tool

Better scenarios?

Imperative vs Declarative

Imperative

reusable granular steps

binds to UI

Declarative

business language

Mink Extension example

ImperativeFeature: Search In order to see a word definition As a website user I need to be able to search for a word

Scenario: Searching for a page that does exist Given I am on "/wiki/Main_Page" When I fill in "search" with "Behavior Driven Development" And I press "searchButton" Then I should see "agile software development"

Feature: Search In order to see a word definition As a website user I need to be able to search for a word

Scenario: Searching for a page that does exist Given there is „Behavior Driven Development” article

And there is „agile software development” article When I search for "Behavior Driven Development" Then there should be "agile software development” reference

Declarative

ImperativeScenario: Registering with already used e-mail Given there are following users: | username | password | email | active | | testuser1 | test1 | test@test.pl | 1 |

When I am on „/register” page And I fill in „username” with „newuser” And I fill in „password” with „123456” And I fill in „email” with „test@test.pl” And I press „register” Then I should see „e-mail is already used”

Declarative

Scenario: Registering with already used e-mail Given there is registered user with „test@test.pl” e-mail When I try to register with „test@test.pl” e-mail Then I should be notified that e-mail is already used

Scenario: Purchasing a product Given there is „Lightsaber” which costs $5 When I add „Lightsaber” to basket Then there should be „Lightsaber” in my basket When I check out my basket Then I should be charged for $5

Many activities

Scenario: Adding product to basket Given there is „Lightsaber” When I add „Lightsaber” to basket Then there should be „Lightsaber” in my basket

Scenario: Checking out basket Given there is „Lightsaber” which costs $5 in my basket When I check out my basket Then I should be charged for $5

One activity

Tips

avoid implementation details

use ubiquitous language

ask for examples

describe one activity

Questions?

Thank you