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Specification by Examples
for Symfony2 applications
About me
Cofounder
Cofounder
on Github
on Twitter
- PHP & Cloud @ Genova - 24 Oct
- Internet Of Things! @ Turin [CFP] - 15 Nov
- CloudComputing @ Turin [CFP ASAP]
Corley S.r.l. - @CorleyCloud
UpCloo LTD - @UpCloo
wdalmut
walterdalmut
www.cloudparty.it
internetof.it
www.cloudconf.it
Repo with all examples
Repo on github
Software delivery
customer wants A
project manager understand B
developers write down C
developers effectively write down D
customer realize to get E
Successive refinements of E
E'
E''
E'''
E''''
E'''''
The customer will never obtain an A
The problem is to achieve a
single communication domain
How many points does it have?
Example from: Bridging the communication gap (Gojko Adzic)
10
5
14
9
Effectively, there is no right
answer.
It depends on what you consider as a point
Behaviour-driven development
is a software development process based on test-driven development
(TDD). Behavior-driven development combines the general techniques
and principles of TDD with ideas from domain-driven design and object-
oriented analysis and design to provide software development and
management teams with shared tools and a shared process to
collaborate on software development.
from wikipedia
BDD
Although BDD is principally an idea about how software development
should be managed by both business interests and technical insight
from wikipedia
Dan North: What is a story?
Behaviour-driven development is an “outside-in” methodology. It starts
at the outside by identifying business outcomes, and then drills down
into the feature set that will achieve those outcomes. Each feature is
captured as a “story”, which defines the scope of the feature along with
its acceptance criteria. This article introduces the BDD approach to
defining and identifying stories and their acceptance criteria.
Read the article here
BDD is more than tools, but we
are here in order to use BDD
methodology in our Symfony2
projects
Tools
Behat - Behaviour-driven framework
Mink - Web Acceptance testing framework
Pay attention on Behat version
The latest is 3.0 (at today) but there are so many examples and
docs for 2.5
We will work with 3.0
Here is a story
Feature: a description of this feature
        Scenario: A business situation
            Given a precondition
            And another precondition
            When an actor execute an action
            And another action appends
            Then some testable result is in place
            And another condition should be verified
        Scenario: Another business scenario starts
Here is a story in Italian
Funzionalità: una generica descrizione di questa funzionalità
        Scenario: una situazione di business
            Data una precondizione
            E ancora una nuova precondizione
            Quando un attore esegue una azione
            E succede anche un altra azione
            Allora esite un risultato testabile
            Ed un nuova condizione da verificare
        Scenario: Un altro scenario di business da verificare
Gherkin is a Business Readable
and Domain Specific Language
that let us describe software’s
behaviour without detailing
how that behaviour is
implemented.
From the cucumber project
Gherkin supports so many
languages
We are building a common language with
different actors involved into to design
process
There are at least two ways to use behat in
your Symfony2 applications
Per-bundle features
Specific features per bundle
Application features
All features in a single folder
Personally prefer a single place for all
features
Mainly because it is so difficult to share the
application bundle strategies to a
customer
Keep the focus on the communication not
how we implement the solution
behat.yml
default:
    suites:
        default:
            path: %paths.base%/features
            contexts: [BehatMinkExtensionContextMinkContext]
    extensions:
        BehatSymfony2Extension: ~
        BehatMinkExtension:
            base_url: http://localhost:8000
            sessions:
                default:
                    symfony2: ~
Behat uses a "FeatureContext"
as a clue for join the Gherkin
language with the application
A feature
Feature: An hello world feature example
    Scenario: Just say hello to me!
        When I am on "/hello/walter"
        Then I should see "Hello Walter"
Every step is a custom method in the
FeatureContext
/** @Given /^I am on "([^"]*)"$/ */
public function goOnPage($url)
{
...
}
Mink carries different predefined steps
I am on "a page"
I press "Get me in!"
I should see "Ok, you are in"
and more... (CSS selectors etc.)
But remember that we are building a
common communication domain
Write down a new step that use a mink's steps instead force a new
definition of something
By Examples
Scenario Outline: Just say hello to everyone!
    When I am on <page>
    Then I should see <hello>
    Examples:
        | page              | hello            |
        | "/hello/walter"   | "Hello Walter"   |
        | "/hello/marco"    | "Hello Marco"    |
        | "/hello/giovanni" | "Hello Giovanni" |
        | "/hello/martina"  | "Hello Martina"  |
Expectations
Scenario Outline: Say a better hello to special guests
    When I am on <page>
    Then I should see <hello>
    Examples:
        | page              | hello                   |
        | "/hello/fabien"   | "Captain on the bridge" |
        | "/hello/walter"   | "Hello Walter"          |
        | "/hello/marco"    | "Hello Marco"           |
        | "/hello/giovanni" | "Hello Giovanni"        |
        | "/hello/martina"  | "Hello Martina"         |
If we run it
Feature: An hello world feature example
Scenario Outline: Say a better hello to special guests
    When I am on <page>
    Then I should see <hello>
    Examples:
    | page              | hello                   |
    | "/hello/fabien"   | "Captain on the bridge" |
        The text "Captain on the bridge" was not found
        anywhere in the text of the current page. (BehatMinkExceptionResponseTextException)
    | "/hello/walter"   | "Hello Walter"          |
    | "/hello/marco"    | "Hello Marco"           |
    | "/hello/giovanni" | "Hello Giovanni"        |
    | "/hello/martina"  | "Hello Martina"         |
‐‐‐ Failed scenarios:
    features/hello.feature:24
Fix the code
class DefaultController extends Controller
{
    public function indexAction($name)
    {
        if ($name == "fabien") {
            $name = "Captain on the bridge";
        }
        return $this‐>render('CorleyBaseBundle:Default:index.html.twig', array('name' => $name));
    }
}
My steps interacts with the entity manager
default:
    suites:
        default:
            path: %paths.base%/features
            contexts:
                ‐ BehatMinkExtensionContextMinkContext
                ‐ HelloFeatureContext:
                    entityManager: '@doctrine.orm.entity_manager'
    extensions:
        BehatSymfony2Extension: ~
        BehatMinkExtension:
            base_url: http://localhost:8000
            sessions:
                default:
                    symfony2: ~
Create contexts
bin/behat ‐‐init
Context constructor
/**
 * Behat context class.
 */
class HelloFeatureContext implements SnippetAcceptingContext
{
    private $entityManager;
    /**
     * Initializes context.
     *
     * Every scenario gets its own context object.
     * You can also pass arbitrary arguments to the context constructor through behat.yml.
     */
    public function __construct(EntityManager $entityManager)
    {
        $this‐>entityManager = $entityManager;
    }
                        
My context clears all before runs
/**
 * @BeforeScenario
 */
public function clearDatabase()
{
    $purger = new ORMPurger($this‐>entityManager);
    $purger‐>purge();
}
Load books for this scenario
Feature: My books features
    Scenario: List my books
        Given there are books
            | title                          | author          |
            | Specification by Examples      | Gojko Adzic     |
            | Bridging the communication gap | Gojko Adzic     |
            | The RSpec Book                 | David Chelimsky |
        When I am on "/books"
        Then I should see "Specification by Examples"
        And I should see "Bridging the communication gap"
        And I should see "The RSpec Book"
Run it!
(and get the missing step definition)
‐‐‐ HelloFeatureContext has missing steps. Define them with these snippets:
    /**
    * @Given there are books
    */
    public function thereAreBooks(TableNode $table)
    {
        throw new PendingException();
    }
My custom step
/**
 * @Given there are books
 */
public function thereAreBooks(TableNode $table)
{
    foreach ($table‐>getHash() as $row) {
        $book = new Book();
        $book‐>setTitle($row["title"]);
        $book‐>setAuthor($row["author"]);
        $this‐>entityManager‐>persist($book);
    }
    $this‐>entityManager‐>flush();
}
Scenarios can share the same background
Feature: My books features
    Background:
        Given there are books
            | title                          | author          |
            | Specification by Examples      | Gojko Adzic     |
            | Bridging the communication gap | Gojko Adzic     |
            | The RSpec Book                 | David Chelimsky |
    Scenario: List my books
        When I am on "/books"
        Then I should see "Specification by Examples"
        And I should see "Bridging the communication gap"
        And I should see "The RSpec Book"
A story
Scenario: An interested user becomes an active user
    Given an interested user with email "walter.dalmut@gmail.com"
    When he goes to homepage
    And he fills all personal fields
    Then he confirms the registration
    And he should be registered as an unconfirmed user
    And he should receive the registration email
    And he should be in the reserved area
Signup Feature Context
class SignupContext implements SnippetAcceptingContext, MinkAwareContext
    {
        private $mink;
        private $minkParameters;
        private $entityManager;
    ...
        public function setMink(Mink $mink)
        {
            $this‐>mink = $mink;
        }
        public function setMinkParameters(array $parameters)
        {
            $this‐>minkParameters = $parameters;
        }
    ...
GIVEN i am an interested user with email
/**
 * @Given I am an interested user with email :arg1
 */
public function anInterestedUserWithEmail($email)
{
    // shared in the feature context
    $this‐>email = $email;
    // Check that is an interested user and not an existing one
    Assert::assertNull(
        $this‐>entityManager
            ‐>getRepository("CorleyBaseBundle:User")‐>findOneByEmail($email)
    );
}
WHEN i fill all personal fields
/**
 * @When I fill all personal fields
 */
public function heFillsAllPersonalFields()
{
    $this‐>mink‐>getSession()‐>getPage()
        ‐>find("css", "#corley_bundle_basebundle_user_email")
        ‐>setValue($this‐>email);
    $this‐>mink‐>getSession()‐>getPage()
        ‐>find("css", "#corley_bundle_basebundle_user_name")
        ‐>setValue(rand(0,100000));
}
THEN I confirm my registration
/**
 * @Then I confirm my registration
 */
public function iConfirmTheRegistration()
{
    $client = $this‐>mink
        ‐>getSession()
        ‐>getDriver()
        ‐>getClient();
    $client‐>followRedirects(false);
    $this‐>mink‐>getSession()‐>getPage()
        ‐>find("css", "#corley_bundle_basebundle_user_submit")‐>click();
}
THEN I should be registered as an
unconfirmed user
/**
 * @Then I should be registered as an unconfirmed user
 */
public function heShouldBeRegisteredAsAnUnconfirmedUser()
{
    $this‐>entityManager‐>clear();
    $entity = $this‐>entityManager
        ‐>getRepository("CorleyBaseBundle:User")
        ‐>findOneByEmail($this‐>email);
    Assert::assertNotNull($entity);
    Assert::assertFalse($entity‐>isConfirmed());
}
THEN I should receive the reg. email
/**
 * @Then I should receive the registration email
 */
public function heShouldReceiveTheRegistrationEmail()
{
    $driver = $this‐>mink‐>getSession()‐>getDriver();
    if (!$driver instanceof KernelDriver) {
        throw new RuntimeException("Only kernel drivers");
    }
    $profile = $driver‐>getClient()‐>getProfile();
    if (false === $profile) {
        throw new RuntimeException("Profiler is disabled");
    }
    $collector = $profile‐>getCollector('swiftmailer');
    Assert::assertCount(1, $collector‐>getMessages());
}
You can wrap a "getProfiler" in a separate method
THEN I should be in the reserved area
/**
 * @Then I should be in the reserved area
 */
public function heShouldBeInTheReservedArea()
{
    $client = $this‐>mink
        ‐>getSession()
        ‐>getDriver()
        ‐>getClient();
    $client‐>followRedirects(true);
    $client‐>followRedirect();
    $this‐>mink‐>assertSession()‐>pageTextContains("Hello reserved area!");
}
You can wrap the redirection in seperate, reusable steps
There are so many features in Behat
But, remember that the goal is to bridging the communication gap
between actors of the same project with different backgrounds
Do not use it for functional testing
(use LiipFunctionalTestBundle for that or anything else)
Thanks for listening
Any question?

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