TDD with BDD in PHP and Symfony

Kamil Adryjanek <kamil@level7systems.pl>
TDD with BDD
in PHP and Symfony

Kamil AdryjanekKamil Adryjanek
Head of Development at
Level7Systems.pl
PHP / Symfony2 trainer
Blogger
KamilAdryjanek.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 testing
SpecBDD ~ 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

BehatBehat
Is Behat a testing tool for business?

BehatBehat
No, Behat is about communication
between business and development.

Behat - installationBehat - installation
composer require --dev behat/behat
composer require --dev behat/mink
composer 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

BehatBehat
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 dashboard
As user
I need to be able to log in

Scenario 1: login formScenario 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 loginScenario 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 loginScenario 3 – successful login
Scenario: successful login to admin panel
Given I am on the „Login” page
When I fill in "email" with: "user@example.com"
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”

BehatBehat
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 CDRs
As api user
I 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
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
When I send POST request to „/customers” with data:
email: user@example.com
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 – Task interfacePhpSpec – Task interface

Sylius and Behat / PhpSpecSylius and Behat / PhpSpec

Thank you!

TDD with BDD in PHP and Symfony

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