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RODRIGO URUBATAN• SOFTWARE DEVELOPER SINCE 1997
• WRITER, RUNNER, CROSSFITTER, SPEAKER, A LITTLE LAZY, AND IN LOVE WITH REMOTE WORK
• HTTP://URUBATAN.COM.BR
• HTTP://SOBRECODIGO.COM
• HTTP://TWITTER.COM/URUBATAN
• HTTP://GITHUB.COM/URUBATAN
OK, BUT HOW’S THAT GOING TO HELP DESIGN SOFTWARE?
• BUSINESS VALUE IS THE KEY
• WHAT IS THE NEXT IMPORTANT THING THE SYSTEM DOES NOT DO YET?
• USE THE BUSINESS LANGUAGE TO SPECIFY THE SOFTWARE
• USE THE BUSINESS LANGUAGE TO TEST THE SOFTWARE
• USE THE BUSINESS LANGUAGE TO WRITE THE SOFTWARE
• USE THE BUSINESS LANGUAGE TO VALIDATE THE SOFTWARE
USER STORIES!!
• AS A …
• I WANT TO ...
• SO THAT ...
• AS A BANK CLIENT• I WANT TO USE THE CASH MACHINE• SO THAT I CAN TAKE MONEY FROM MY ACCOUNT
BEHAVIOUR SPECIFICATION
• CONTEXT
• ACTIONS
• VERIFICATION
• GIVEN THERE IS MONEY IN MY ACCOUNT• AND I HAVE A VALID CARD• AND THE MONEY DISPENSER HAS MONEY• WHEN I ASK THE MACHINE FOR MONEY• THEN THE MONEY SHOULD BE SUBTRACTED FROM MY
ACCOUNT• AND THE MONEY SHOULD BE DELIVERED TO ME• AND MY CARD SHOULD BE RETURNED
DID YOU REMEMBER WHERE?
• IN TESTER SPREADSHEETS, SOMETIMES WITH COLUMNS INSTEAD OF OF GIVEN/WHEN/THEN
• IT IS ALMOST THE SYNTAX FOR THE GHERKIN LANGUAGE!!
LET’S TRY THAT!• GIVEN THERE IS MONEY IN MY ACCOUNT• AND I HAVE A VALID CARD• AND THE MONEY DISPENSER HAS MONEY• WHEN I ASK THE MACHINE FOR MONEY• THEN THE MONEY SHOULD BE SUBTRACTED FROM MY
ACCOUNT• AND THE MONEY SHOULD BE DELIVERED TO ME• AND MY CARD SHOULD BE RETURNED
• ACCOUNT.HAS_ENOUGH_MONEY?(VALUE)• CARD.VALID?• DISPENSER.HAS_MONEY?• MACHINE.I_WANT(VALUE)• ACCOUNT.SUBTRACT(VALUE)• MACHINE.DELIVER_MONEY(VALUE)• MACHINE.RETURN_CARD
BDD DEVELOPMENT CYCLETalk to the client, write a
user story orSelect a user story Detail the story
into scenarions
Automate scenarios with selected tool
Run tests and see them fail
Write ony the code to make
tests pass
Refactor
Almost the same as TDD?
OK, HOW IS THAT DIFFERENT FROM TDD “RED, GREEN, REFACTOR”?• THE MAIN FOCUS IS NOT THE TEST, IN REALITY THE AUTOMATE STEP CAN BE SKIPED SOMETIMES
• THE MAIN FOCUS IS ON COMMUNICATION
• TEST BUSINESS BEHAVIOUR NOT LANGUAGE DEPENDENT FUNCTIONS
• BEHAVIOUR IS MORE IMPORTANT TO THE SOFTWARE THAN HOW IT WAS IMPLEMENTED
• THE MAIN FOCUS IN USING A UBIQUITOUS LANGUAGE LIKE IN DDD
• USING THE UBIQUITOUS LANGUAGE, THE USER STORY TEMPLATE AND THE SCENARIO TEMPLATE THE COMMUNICATION WITH THE ENTIRE TEAM WILL IMPROVE A LOT
THAT SAME CONTEXT SINTAXE CAN BE AUTOMATED BY:
• CUCUMBER USING GHERKIN - HTTPS://CUCUMBER.IO/
• THOUGHTWORKS GAUGE - HTTP://GETGAUGE.IO/
• RSPEC CAN USE THAT SYNTAX TO NAME THE TEST SPECS
• JBEHAVE WAS CREATED THINKING ABOUT THAT
• SPECFLOW USING GHERKIN - HTTP://WWW.SPECFLOW.ORG/
SAMPLE GHERKIN CODEFEATURE: A SAMPLE CODE FOR MY PRESENTATION
AS A SPEAKERI WANT TO HAVE SOME CODE SAMPLESSO THAT EVERYONE UNDERSTAND WHAT I'M TALKING ABOUT
SCENARIO: DOING A SIMPLE GOOGLE SEARCHGIVEN I'M ON THE GOOGLE HOME PAGEWHEN I FILL THE SEARCH FIELD WITH "URUBATAN"THEN I WANT TO SEE "MY WEB PAGE" IN THE RESULTSAND I WANT TO SEE "MY FACEBOOK PROFILE" IN THE RESULTS
SAMPLE CUCUMBER RUBY CODEGIVEN(/^I'M ON THE GOOGLE HOME PAGE$/) DOPENDING # EXPRESS THE REGEXP ABOVE WITH THE CODE YOU WISH YOU HAD
END
WHEN(/^I FILL THE SEARCH FIELD WITH "(.*?)"$/) DO |ARG1|PENDING # EXPRESS THE REGEXP ABOVE WITH THE CODE YOU WISH YOU HAD
END
THEN(/^I WANT TO SEE "(.*?)" IN THE RESULTS$/) DO |ARG1|PENDING # EXPRESS THE REGEXP ABOVE WITH THE CODE YOU WISH YOU HAD
END
SAMPLE CUCUMBER JAVA CODEpublic class MyStepdefs {
@cucumber.api.java.en.Then("^I want to see \"([^\"]*)\" in the results$")public void iWantToSeeInTheResults(String arg0) throws Throwable {
// Write code here that turns the phrase above into concrete actionsthrow new cucumber.api.PendingException();
}@cucumber.api.java.en.When("^I fill the search field with \"([^\"]*)\"$")public void iFillTheSearchFieldWith(String arg0) throws Throwable {
// Write code here that turns the phrase above into concrete actionsthrow new cucumber.api.PendingException();
}@cucumber.api.java.en.Given("^I'm on the google home page$")public void iMOnTheGoogleHomePage() throws Throwable {
// Write code here that turns the phrase above into concrete actionsthrow new cucumber.api.PendingException();
}}
SAMPLE GAUGE CODEA SAMPLE CODE FOR MY PRESENTATION=============
AS A SPEAKER, I WANT TO HAVE SOME CODE SAMPLES, SO THAT EVERYONE UNDERSTAND WHAT I'M TALKING ABOUT
DOING A SIMPLE GOOGLE SEARCH-----------* I'M ON THE GOOGLE HOME PAGE* I FILL THE SEARCH FIELD WITH "URUBATAN"* I WANT TO SEE "MY WEB PAGE" IN THE RESULTS* I WANT TO SEE "MY FACEBOOK PROFILE" IN THE RESULTS
SAMPLE GAUGE JAVA CODEPUBLIC CLASS SAMPLEGAUGE {
@STEP("I'M ON THE GOOGLE HOME PAGE")
PUBLIC VOID GOTOGOOGLE() {
// STEP IMPLEMENTATION
}
@STEP("I FILL THE SEARCH FIELD WITH <VALUE>")
PUBLIC VOID FILLFIELD(STRING VALUE) {
// STEP IMPLEMENTATION
}
@STEP("I WANT TO SEE <ADDR> IN THE RESULTS")
PUBLIC VOID CHECKVALUE(STRING VALUE) {
// STEP IMPLEMENTATION
}
}
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