BDD & Behat for Srijan Technologies

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BEHAVIOUR DRIVEN DEVELOPMENT & BEHAT

TELLING STORIES THROUGH CODE

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Senior Software Engineer Viva IT

@Brunty @PHPem

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BEFORE WE TALK ABOUT BDD

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LET’S QUICKLY TALK ABOUT TESTING

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TDD VS BDD

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BDD IS TDD ‘DONE RIGHT’IT’S OFTEN SAID THAT…

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TDD IS BUILDING THE THING RIGHT

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BDD IS BUILDING THE RIGHT THING

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BEHAVIOUR DRIVEN DEVELOPMENT

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WE’LL BE LOOKING AT SCENARIO BDD

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BDD IS A SECOND-GENERATION, OUTSIDE-IN, PULL-BASED, MULTIPLE-STAKEHOLDER, MULTIPLE-SCALE, HIGH-AUTOMATION, AGILE METHODOLOGY.

DAN NORTH

http://dannorth.net/whats-in-a-story/


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SECOND-GENERATIONBREAK DOWN

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MULTIPLE-STAKEHOLDERBREAK DOWN

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AGILE METHODOLOGYBREAK DOWN

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MULTIPLE STAKEHOLDERS

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CONVERSATIONS ARE KEY

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HAVING CONVERSATIONS > CAPTURING

CONVERSATIONSAUTOMATING

CONVERSATIONS>

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HAVE CONVERSATIONS BEFORE YOU START WRITING CODE

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CAPTURE THE CONVERSATIONS SO YOU CAN USE THEM TO DRIVE DEVELOPMENT

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BDD IS THE ART OF USING EXAMPLES IN CONVERSATIONS TO ILLUSTRATE BEHAVIOUR

LIZ KEOGH

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EXAMPLES ARE ESSENTIAL

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SO, HOW DO WE WORK WITH THIS?

@Bruntyhttps://github.com/cucumber/cucumber/wiki/Gherkin

GHERKIN DSL

https://github.com/cucumber/cucumber/wiki/Gherkin

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HUMAN READABLEGHERKIN IS…

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MULTI-LINGUAL SUPPORTTOOLS CAN INCLUDE…

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EN-PIRATEINCLUDING

https://github.com/Behat/Gherkin/blob/master/i18n.php#L313

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KEYWORD BASEDGHERKIN IS…

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LINE ORIENTEDGHERKIN IS…

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DOCUMENTATIONGHERKIN IS…

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AUTOMATIONGHERKIN ALLOWS…

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DEVELOPERS LOVE AUTOMATION

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WRITING STORIES

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BE DESCRIPTIVE

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FEATURES ARE STORIES

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SINGLE FEATURE PER FILE

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Feature: As a [role] I want [feature] So that [benefit]

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Feature: In order to [achieve value] As a [role] I want [feature]

https://lizkeogh.com/2008/05/14/rip-as-a-i-want-so-that/

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SCENARIOS

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SCENARIOS ARE EXAMPLES

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EXAMPLES ARE ESSENTIAL

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MULTIPLE SCENARIOSFEATURES CAN HAVE

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STEPS

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MULTIPLE STEPSSCENARIOS HAVE…

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KEYWORDS

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GIVENPUTS THE SYSTEM IN A KNOWN STATE

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WHENDESCRIBE A KEY ACTION

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THENDESCRIBE AN OBSERVABLE OUTCOME

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Given I have a “Large T-Shirt” product

When I add a “Large T-Shirt” to my basket

Then I should have a “Large T-Shirt” in my basket

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ANDTHERE’S ALSO…

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BUTTHERE’S ALSO…

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Given I have a “Large T-Shirt” product that costs £9.99

And I have an empty basket

And I am a tax-exempt customer



And the basket total should be £9.99

But I should not have tax applied to my order

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STORY STRUCTURE: THE MAKEUP OF A FEATURE FILE

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Feature: As a customer

I want to be able to add products to my basket

So that I can have a gift for my partner

Scenario: I can add a product to the basket

Given I have a "Large T-Shirt" product



FEATURE

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SCENARIO








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STEP








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THIS IS GREAT, BUT HOW DO WE (DEVELOPERS) WORK WITH IT?

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STEP DEFINITIONS

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Given I have a “Large T-Shirt” product

When I add that product to my basket

Then I should see that product in my basket

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ARGUMENTS

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TRANSFORMERS

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TAGS

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HOOKS

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BEFORE & AFTER SUITES, FEATURES, SCENARIOS, STEPS

HOOKS

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SUITES & PROFILES

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TEST FEATURES WITH DIFFERENT CONFIGURATIONS

SUITES ALLOW YOU TO…

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THEY CAN USE THE SAME FEATURE FILES. OR THEY CAN USE DIFFERENT FEATURE FILES

FOR EXAMPLE:

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YOU CAN USE THE SAME FEATURE FILE TO TEST DIFFERENT IMPLEMENTATIONS

WITH SUITES AND TAGS…

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YOU CAN HAVE A UI SUITE THAT USES DIFFERENT STEP DEFINITIONS THAN A SERVICE / DOMAIN / LOWER LEVEL SUITE

FOR EXAMPLE:

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YOU CAN CHANGE IMPLEMENTATION WITHOUT CHANGING YOUR DOCUMENTED BUSINESS RULES

WITH SUITES AND TAGS…

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THIS IS WHERE THE POWER LIES

FOR ME…

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IMPLEMENTATION CHANGES MORE FREQUENTLY THAN BUSINESS RULES

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WRITING A GOOD STORY

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Scenario: I can add a product to my basket

Given I am on the “/product/1” page

When I press “Add to basket”

Then I should see “Playstation 4”

And I should see £250

BAD STORY

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Scenario: I can add a single product to my basket

Given I have a “Playstation 4” that costs £250

When I add the “Playstation 4” to my basket

Then I should have 1 product in my basket

And the basket total should be £250

BETTER STORY

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Scenario: I can add a product to my basket

Given I am on the “/product/1” page

When I press “Add to basket”

Then I should see “Playstation 4”

And I should see £250

WHAT HAPPENS WHEN THE UI CHANGES TO SAY “ADD TO CART”?

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DON’T WRITE IMPLEMENTATION IN FEATURES

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IN SUMMARY

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CONVERSATIONS.

CONVERSATIONS.

CONVERSATIONS.

CONVERSATIONS.

CONVERSATIONS.

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STORIES TOLD BY REAL WORLD EXAMPLES.

USER STORIES AS REQUIREMENTS.

INVOLVE MULTIPLE STAKEHOLDERS.

WRITE FEATURES BEFORE CODE.

WRITE FEATURES WITHOUT IMPLEMENTATION.

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BEGINNING: HAVE A CONVERSATION, CAPTURE THAT CONVERSATION

MIDDLE: AUTOMATE AND IMPLEMENT THAT CONVERSATION

END: HAPPY STAKEHOLDERS AND WELL BUILT SOFTWARE

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LINKS & READINGhttps://cucumber.io/docs

https://adamcod.es/2014/05/15/test-doubles-mock-vs-stub.html

https://github.com/cucumber/cucumber/wiki/Gherkin


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

http://lizkeogh.com/category/bdd/

http://lizkeogh.com/2014/01/22/using-bdd-with-legacy-systems/

http://inviqa.com/insights/bdd-guide

https://cucumber.io/blog/2015/03/24/single-source-of-truth

https://github.com/Behat/Gherkin/blob/master/i18n.php#L313

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

http://lizkeogh.com/category/bdd/

http://inviqa.com/insights/bdd-guide

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THANKS FOR LISTENING

@Brunty

@Brunty @PHPem [email protected]

http://mfyu.co.uk

BDD & Behat for Srijan Technologies

Technology

Transcript of BDD & Behat for Srijan Technologies