TDD with BDD in PHP and Symfony

Kamil Adryjanek <[email protected]>

TDD with BDD in PHP and Symfony


Kamil AdryjanekKamil Adryjanek

Head of Development at Level7Systems.pl

PHP / Symfony2 trainer

BloggerKamilAdryjanek.com

Football amateur


Level 7 Systems LtdLevel 7 Systems Ltd

Level 7 Systems delivers business and residential communication services based on the SIP technology.

VoIPstudio is a next generation communication platform tailored to a specific business requirements

Powerful SIP Trunking solution for inbound and outbound calls aimed at companies which have their own PBX.


We are hiring!We are hiring!

1)Junior PHP / Symfony2 developer

2)PHP / Symfony2 developer


AgendaAgenda

1) Why we should write tests?

2) What is TDD?

3) What is BDD?

4) StoryBDD with Behat

5) SpecBDD with PhpSpec


TestingTesting

„There are two types of programmers:those who write tests,

and those who will be writing tests.”


TestingTesting

Why should we write tests?Why don't we write tests?


TestingTesting


TestingTesting

How to write tests?


Test-Driven DevelopmentTest-Driven Development

Tests go first...





How to write tests for something that does not exist?


The projectThe project


The project – customer needsThe project – customer needs


The projectThe project

The first step in every project is a discussion about the behaviors of the software or feature

to be built.


Behaviour-Driven DevelopmentBehaviour-Driven Development

BDD is a methodology for developing software through continuous example-based

communication between developers and a business. This communication happens in a form

that both the business and developers can clearly understand - examples


BDDBDD

Business Development

requirements

examples


BDDBDD

● Better understanding of business● Better ideas● Developers can improve system● Developers can help business


TDD vs BDDTDD vs BDD

● TDD focuses on the DEVELOPER's opinion on how parts of the software should work

● BDD focuses on the USERs’ opinion on how they want your application to behave.


Evolution of TDDEvolution of TDD

StoryBDD ~ functional testingSpecBDD ~ unit testing

Instead of writing tests you should think of specifying behavior.


StoryBDDStoryBDD

Scenarios (examples) go first...


StoryBDDStoryBDD

StoryBDD helps ensuring that development team has understanding of business on the same level

that client does


What is Behat?What is Behat?

● Open Source framwork● official BDD tool for PHP● design tool (design by example)● inspired by Ruby’s Cucumber project● easy integration with Symfony framework


Behat Behat

Is Behat a testing tool for business?


Behat Behat

No, Behat is about communication between business and development.


Behat - installationBehat - installation

composer require --dev behat/behatcomposer require --dev behat/minkcomposer require --dev behat/mink-extension


Behat scenarioBehat scenario

Scenario: Some description of the scenario Given some context When some event Then outcome


Behat scenarioBehat scenario

Scenario: Some description of the scenario Given some context And more context When some event And second event occurs Then outcome And another outcome But another outcome


Behat Behat

How does it work?


Behat – context classBehat – context class


Behat – translationBehat – translation


FeatureFeature

I want to be able to log in with username and password via login page


Behat featureBehat feature

In order to access admin dashboardAs userI need to be able to log in


Scenario 1: login form Scenario 1: login form

Scenario: login form Given I am on the „homepage” page When I press „Login” Then I should be on the „Login” page And I should see „email” field And I should see „password” field And I should see „Login” button


Scenario 2 – unsuccessful login Scenario 2 – unsuccessful login

Scenario: Login with empty data Given I am on the „Login” page When I press „Login” Then I should still be on the „Login” page And I should see „E-mail and/or password is required.”


Scenario 3 – successful login Scenario 3 – successful login

Scenario: successful login to admin panel Given I am on the „Login” page When I fill in "email" with: "[email protected]" And I fill in "password" with: "$secret" And I press „Login” Then I should be on the „Dashboard” page And I should see „Admin dashboard”


Behat Behat

What about „testing” REST API?


FeatureFeature

I want to be able to register customer account via REST API


Behat featureBehat feature

In order to list my CDRsAs api userI need to be able to register customer


Scenario 1 – invalid HTTP methodScenario 1 – invalid HTTP method

Scenario: register with invalid method Given I am not authenticated When I send GET request to „/customers” Then the response status code should be 405


Scenario 2 – POST empty dataScenario 2 – POST empty data

Scenario: register customer with empty data Given I am not authenticated When I send POST request to „/customers” Then the response status code should be 400 And only following properties should exist: message errors And the „message” property should contain „Validation errors.” And the „errors” property should be array with „2” elements


Scenario 3 – successful registrationScenario 3 – successful registration

Scenario: successful customer registration Given I am not authenticated When I send POST request to „/customers” with data: email: [email protected] password: $ecret And the response status should be 201 And only following properties should exist: data links


Bug-Driven Development?


BehatBehat

1) Create scenario that will produce a „bug”

2) Run Behat scenario that will fail

3) Fix the bug / refactor

4) Go to step 2 until scenario passes


What about code specification?


SpecBDDSpecBDD

(Code) specifications go first...


What is PhpSpec?What is PhpSpec?

● Open Source framwork● design tool (design by specification)● allows to describe the behaviour of an object you are about to write / create

● inspired by Ruby’s RSpec project


PhpSpecPhpSpec

Create (design) simple class for storing tasks


PhpSpec - featurePhpSpec - feature

We are going to implement a class that:● will store a collection of tasks;● we can add a task to;● can be marked as done.


PhpSpec - installationPhpSpec - installation● create composer.json file:

● and install:composer install


PhpSpec – describePhpSpec – describe


PhpSpec – runPhpSpec – run


PhpSpec – treePhpSpec – tree


PhpSpec – TaskCollectionSpecPhpSpec – TaskCollectionSpec


PhpSpec – specifyPhpSpec – specify








PhpSpec – TaskCollectionPhpSpec – TaskCollection


PhpSpec – codePhpSpec – code


PhpSpec – TaskCollectionPhpSpec – TaskCollection


PhpSpec – specifyPhpSpec – specify




PhpSpec – Task interfacePhpSpec – Task interface






PhpSpec – codePhpSpec – code




Sylius and Behat / PhpSpecSylius and Behat / PhpSpec


Thank you!

Technology

TDD with BDD in PHP and Symfony