Driving development in PHP

Driving

Your

Development

In

PHP

About this guy

● Strict EmailValidator PHP library, dependency of Symfoy 2 framework

● ListenersDebugCommand, dependency of eZ Publish CMS

● Works at Packlink

● @egulias in Twitter/Github

This talk is NOT about automated testing

Because you are already testing, right?

What means “driving your development”?

"Tactics is what you do when there is something to do; strategy is what you do when there is

nothing to do."

by Ksawery Tartakower leading Polish and French chess grandmaster.

Are the tactics and tools we, software developers, have for helping us in creating software we won't

hate in 2 weeks

Development Driven (tactics)

VS

Application Architecture (strategies)

Development driven are our “tactics” for when we are developing.

And Software architecture are the “strategies” we follow to guide future development.

Which Strategies do we have?

● Hexagonal (ports and adapters) - Alistair Cockburn and adopted by Steve Freeman, and Nat Pryce in their book Growing Object Oriented Software

● Clean Architecture, by Robert C. Martin

● Layered Architecture, used by Eric Evans in Domain Driven Development

● Event Driven, by Martin Fowler

● Command Query Responsibility Segregation (CQRS) by Martin Fowler

● And many others

Which Tactics do we have?

● Test Driven Development - Kent Beck

● Domain Driven Design - Eric Evans

● Behavior Driven Development - Dan North

● Database Driven Development

● Feature Driven Development - Jeff de Luca

● And many others

TDD – 2002 – Kent Beck

DDD – 2003 – Eric Evans

BDD - ~2004 – Dan North

TEST DRIVEN DEVELOPMENT

Test Driven Development

● Make the test red

● Make it green (Implement)

● Refactor (Remove duplication)

Test Driven Development

● Assertion First ● Baby Steps

https://github.com/egulias/TagDebug/blob/master/Tests/Tag/Filter/NameTest.php

https://github.com/egulias/TagDebug/blob/master/Tests/Tag/Filter/NameTest.php

https://github.com/egulias/TagDebug/blob/master/Tag/Filter/Name.php

https://github.com/egulias/TagDebug/blob/master/Tests/Tag/Filter/NameTest.php

Test Driven Development

● Triangulation ● Oblivious Implementation

Test Driven Development

Tools

Test Driven Development

● PHPUnit– Alone

– Mockery

– Prophecy

– Phake

● Simpletest

Test Driven Development

● PHPUnit– Alone

– Mockery

– Prophecy

– Phake

● Simpletest

https://github.com/egulias/TagDebug/blob/master/Tests/Tag/Filter/NameTest.php

Test Driven Development

● PHPUnit– Alone

– Mockery

– Prophecy

– Phake

● Simpletest

https://github.com/egulias/TagDebug/blob/master/Tag/Filter/Name.php

Test Driven Development

● PHPUnit– Alone

– Mockery

– Prophecy

– Phake

● Simpletest

Test Driven Development

● PHPUnit– Alone

– Mockery

– Prophecy

– Phake

● Simpletest (2012)

100% COVERAGE

BECAUSE YEAH

DOMAIN DRIVEN DESIGN

Is NOT a silver bullet

● Objects with Business meaning and value

● Databases, Frameworks, etc are implementation details

● Focus your development on business behavior

Domain Driven Design

Domain Driven Design

There are artifacts and strategies but no tools

Entity

Aggregate

Repository

Value Object

BoundedContext

Ubiquitous Language

Factory

Service

DomainEvent

Domain Driven Design

Constraints

Specification

IntentionRevealingInterfaces

Side-effectFREE

Functions

Shared Kernel

Anti-corruptionLayer

Domain Driven Design

https://github.com/Bodaclick/EVTCore/blob/dev/src/EVT/CoreDomain/Lead/Event.php

https://github.com/Bodaclick/EVTCore/blob/dev/src/EVT/CoreDomain/Lead/Lead.php

https://github.com/Bodaclick/EVTCore/blob/dev/src/EVT/CoreDomain/RepositoryInterface.php

https://github.com/Bodaclick/EVTCore/blob/dev/src/EVT/CoreDomainBundle/Resources/config/services.yml

https://github.com/Bodaclick/EVTCore

BEHAVIOR DRIVEN DEVELOPMENT

Behavior Driven Development

● Test method names should be sentences● A simple sentence template keeps test methods

focused● An expressive test name is helpful when a test

fails● “Behavior” is a more useful word than “test”● Acceptance criteria should be executable

From http://dannorth.net/introducing-bdd/

Behavior Driven Development

Tools

Behavior Driven Development

Behathttp://docs.behat.org

https://github.com/Sylius/Sylius/blob/master/features/backend/shipping_categories.feature

https://github.com/Sylius/Sylius/blob/master/src/Sylius/Bundle/ShippingBundle/Behat/ShippingContext.php

Behavior Driven Development

phpSpechttp://phpspec.net/docs/introduction.html

Unit Testing for BDD

https://github.com/Sylius/Sylius/blob/master/src/Sylius/Component/Shipping/spec/Sylius/Component/Shipping/Calculator/FlexibleRateCalculatorSpec.php

What about the real world?

All what you have just seen, are real world examples

Real world companies

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