TDD with phpspec2

Who I am• Anton Serdyuk

• email/jabber: anton.serdyuk@gmail.com

• skype: serdyuk.anton

• twitter: @anton_serdyuk

• facebook: anton.serdyuk

Overview

Auto-tests forms

• Functional tests (+BDD)

• Integration tests

• Unit tests

Functional tests

• Use full deployed application instance

• Test business expectations

• Use the same UI interactions as real user

Functional tests with phpunit example

BDD (or story BDD)

• Story-driven functional tests

• BDD ⊂ Functional tests

BDD with behat example

Integration tests

• Use integrated parts of applications

• Can use database, filesystem etc.

• Can test API, Doctrine repositories etc.

Integration tests with PHPUnit example

Unit tests

• Use small parts of code

• Can not use database

• Can not use filesystem

• Extremely fast

Consider using appropriate tools for testsphpunit behat phpspec codeception

Functional + + +

Integration + +(sometimes) +

Unit + + +

My personal preference

• behat for functional and API integration tests

• PHPUnit for integration tests

• phpspec for unittest

phpspec basics

Installation

Create testfor class Wow\Hero

Run testsphpspec will create classes for you

Run testsgenerated class Wow\Hero

Run testsRun tests again, now with generated class

Matchers (assertions)Every hero has level

Matchersphpspec will generate code for you

Matchersphpspec will generate code for you

MatchersRed

MatchersGreen

MatchersRefactor

Matchers• Identity (return, be, equal, beEqualTo) - ===

• Comparison (beLike) - ==

• Throw (throw -> during) - exceptions

• Type (beAnInstanceOf etc.) - type

• Custom matchers

• http://www.phpspec.net/cookbook/matchers.html

MatchersUse source code for more matchers

Exception MatchersGenerate

Exception MatchersGenerate

Exception MatchersGenerate

Exception MatchersRed

Exception MatchersGreen

MocksEvery Hero has race and class

MocksGenerate

MocksGenerate

MocksGenerate

MocksRed

MocksGreen

MocksGreen (whoops!)

MocksGreen

MocksRefactor - let() / letgo()

MocksRefactor - let() / letgo()

MocksRefactor

Predictions

PredictionsRed

PredictionsGreen

PredictionsRed

PredictionsGreen

Advanced topics

Nested Object Matchers

Public Property MockSometimes you want to mock public properties

Promises and Predictions Order1) Promises -> 2) Predictions -> 3) Call

Promises and Predictions Order1) Promises -> 2) Predictions -> 3) Call

Promises and Predictions Order1) Promises -> 2) Predictions -> 3) Call

Predictions Argument Wildcarding

Predictions Argument Wildcarding

• Argument::exact($value)

• Argument::type($typeOrClass)

• Argument::which($method, $value)

• Argument::that(callback)

• Argument::any()

• Argument::cetera()

• https://github.com/phpspec/prophecy#arguments-wildcarding

Array MocksGenerate

Array MocksGenerate

Array MocksRed

Array MocksGreen (whoops!)

Array MocksGreen

Get Mock Object

Get Mock Object

Get Mock ObjectGenerate

Get Mock ObjectGenerate (whoops!)

Get Mock ObjectThis is PHP, baby

???

Get Mock ObjectRight way

Best PracticesIMHOs

Do not use TDD in simple CRUD applications (IMHO)

• High cost

• Slow (in terms of development time)

• Zero profit

• Use functional and integration tests instead

Do not mock 3rd party code

• Large complicated tests

• You actually test not how your code works with this library, but how your code works with your understanding of this library

Do not mock 3rd party codeUse interfaces instead of 3rd party dependent code

Consider using appropriate DI library

• symfony/di and Pimple are not well suited for TDD because of large amount of small classes

• you must define rule for every class, which is very boring

• There are some DI containers which will create most objects without explicitly defined rules by just reading constructor arguments type hints through reflection

Consider using appropriate DI library

• zend-di

• Laravel IoC Container - http://laravel.com/docs/ioc

• PHP-DI - http://php-di.org/

phpspec at CI

phpspec junit formatter

Thank you!Questions?