behaviour driven development with cucumber for java
Post on 27-Dec-2015
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BDD
Domain Driven Design - DDD● Common understanding● Common language● Test Driven Development - TDD● Good technical practices● Small steps● Combined → Behaviour Driven Development
Test automation
Test Driven Development, TDD – Develop it the
right way Behaviour Driven Development, BDD –
Develop the right thing
Three core principles
• Business and Technology should refer to the same system in the same way
• Any system should have an identified, verifiable value• Up-front analysis, design and planning all have a diminishing
return
Verifiable value
• Protect revenue• Increase revenue• Manage cost• Increase brand value• Make the product remarkable• Provide more value to your customer
Big design up-front
• No big design up-front• The further you plan ahead, the less accurate you will be
Three questions
• What is the most important thing the system should do?• What is the next most important thing the system doesn't do
yet?• If we were to switch off the system, where and what would be
the biggest impact?
Interpret and translate We need to read the spec. Understand it Translate it into code Parse and execute it? No, not all specs are created equal
Format
• Given – Setup the system• When – Change the state of the system• Then – Verify the new state
Why Cucumber
It is one of the least technical tools It is a very active open source project It supports a variety of languages
A concrete example
Feature: Life of IT guysIn order to get good salaryAs a it guyI want to keep my boss happy
Scenario: I am a testerGiven I am a bad testerWhen I go to workThen I mess with itAnd my boss fires meBut the developer likes me
Parse and execute
● A parser is developed
● Add native code to implement the steps Setup – Given Execute – When Assert - Then
Write a step definition in Java@Given("^I am a bad tester$")public void I_am_a_bad_tester(){System.out.println("@Given--I am a bad tester");}@When("^I go to work$")public void I_go_to_work(){System.out.println("@When---I go o work");}@Then("^I mess it$")public void I_mess_with_it(){System.out.println("@Then--I mess it");}@And("^my boss fires me$")public void my_boss_fires_me(){System.out.println("@And---my boss fires me");}@But("^the developer likes me$")public void the_developer_likes_me(){System.out.println("@But--the developer likes me");Assert.assertTrue(false);
}
Write code to make the step pass@Given("^I am a [a-zA-Z]{1,} tester$")public void I_am_a_bad_tester(){System.out.println("@Given--I am a bad tester");}@When("^I go to work$")public void I_go_to_work(){System.out.println("@When---I go o work");}@Then("^I [a-zA-Z]{1,} it$")public void I_mess_with_it(){System.out.println("@Then--I mess it");}@And("^my boss [a-zA-Z]{1,} me$")public void my_boss_fires_me(){System.out.println("@And---my boss fires me");}@But("^the developer [a-zA-Z]{1,} me$")public void the_developer_likes_me(){System.out.println("@But--the developer likes me");
}
Why is Cucumber better
● Compared to well known tools like JUnit?● It isn't, it's just easier to read for non coders● The readability has increased● Communication is easier
Tips Always use the a common language Don't over specify – start easy Never specify implementation details
Resources
Cucumber - http://cukes.info/ Selenium - http://seleniumhq.org/ Maven - http://maven.apache.org/ Jenkins - http://jenkins-ci.org/ Blog
-http://thomassundberg.wordpress.com/
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