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Behaviour Driven Development with Cucumber for Java

Behaviour Driven Development with Cucumber for Java. BDD. Domain Driven Design - DDD ● Common understanding ● Common language ● Test Driven Development - TDD ● Good technical practices ● Small steps ● Combined → Behaviour Driven Development. Test automation.

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Behaviour Driven Development with Cucumber for Java

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  1. Behaviour Driven Development with Cucumber for Java

  2. BDD Domain Driven Design - DDD ● Common understanding ● Common language ● Test Driven Development - TDD ● Good technical practices ● Small steps ● Combined → Behaviour Driven Development

  3. Test automation • Test Driven Development, TDD – Develop it the right way • BehaviourDriven Development, BDD – Develop the right thing

  4. 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

  5. Common language Used by all involved • Customer • Developers • Others?

  6. Verifiable value • Protect revenue • Increase revenue • Manage cost • Increase brand value • Make the product remarkable • Provide more value to your customer

  7. Big design up-front • No big design up-front • The further you plan ahead, the less accurate you will be

  8. 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?

  9. Time to create a specification

  10. Time to create a specification When are we done?

  11. 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

  12. Solution Write specifications so • Translations isn't needed • It is possible to execute them

  13. Format • Given – Setup the system • When – Change the state of the system • Then – Verify the new state

  14. Tools

  15. Audience Readers • Customers • Developers Maintainers • Product owner • Developers

  16. Why Cucumber • It is one of the least technical tools • It is a very active open source project • It supports a variety of languages

  17. A concrete example Feature: Life of IT guys In order to get good salary As a it guy I want to keep my boss happy Scenario: I am a tester Given I am a bad tester When I go to work Then I mess with it And my boss fires me But the developer likes me

  18. Advantages The format is ● Easy to read ● Easy to understand ● Easy to discuss ● Easy to parse

  19. Parse and execute ● A parser is developed ● Add native code to implement the steps • Setup – Given • Execute – When • Assert - Then

  20. 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); }

  21. Run it and watch it fail

  22. 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"); }

  23. Run it again and see the step pass

  24. 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

  25. Benefits ● Less unnecessary work ● Better regression tests ● Less speculative work ● Less re-work

  26. Maintenance • Maintained together ● Specs ● Tests ● Code • Maven • Continuous Integration, CI

  27. Tips • Always use the a common language • Don't over specify – start easy • Never specify implementation details

  28. Do not focus on tools • They will never solve the problem • A fool with a tool is still a fool

  29. Resources • Cucumber - http://cukes.info/ • Selenium - http://seleniumhq.org/ • Maven - http://maven.apache.org/ • Jenkins - http://jenkins-ci.org/ • Blog -http://thomassundberg.wordpress.com/

  30. Thank You

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