Behavior driven development
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The document discusses Behavior Driven Development (BDD) in PHP. It introduces BDD as a process that writes tests first using a common language that both customers and developers understand. This allows requirements and tests to remain in sync. The document outlines issues with traditional testing approaches and how BDD addresses them. It introduces the Gherkin language and Behat, a PHP BDD framework that allows writing tests in Gherkin's human-readable format.
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Behavior driven development
- 1. BDD Behavior Driven Development in PHP Slide 1 TEQneers GmbH & Co. KG www.teqneers.de
- 2. Development: back then and today Slide 2 TEQneers GmbH & Co. KG www.teqneers.de
- 3. Dirty Hacking Slide 3 TEQneers GmbH & Co. KG www.teqneers.de
- 4. Dirty Hacking ‣ No documentation ‣ No testing ‣ No clue if it still working ‣ Maintenance doesn’t really matter ‣ Code changes are a lottery ‣ Easy refactoring impossible Slide 4 TEQneers GmbH & Co. KG www.teqneers.de
- 5. Automated testing Slide 5 TEQneers GmbH & Co. KG www.teqneers.de
- 6. Automated Testing ✓Verify code or results ✓Can be automated ✓Code first, add tests later ‣ Time gap between development and testing ‣ Test not based on original requirements ‣ Tests influenced by code Slide 6 TEQneers GmbH & Co. KG www.teqneers.de
- 7. Test-Driven Development Slide 7 TEQneers GmbH & Co. KG www.teqneers.de
- 8. Test-Driven Development ✓Tests follow your original requirements ✓Code is an easy solution to the problem ✓Tests for all code Slide 8 TEQneers GmbH & Co. KG www.teqneers.de
- 9. Test-Driven Development ‣ Write tests first, add code later ‣ Feels unnatural ‣ Tests written by developers ‣ Potential for over-design ‣ Customer unable to participate Slide 9 TEQneers GmbH & Co. KG www.teqneers.de
- 10. Behavior-Driven Development Slide 10 TEQneers GmbH & Co. KG www.teqneers.de
- 11. Audience Customer Slide 11 TEQneers GmbH & Co. KG www.teqneers.de
- 12. Audience Customer Tester Slide 11 TEQneers GmbH & Co. KG www.teqneers.de
- 13. Audience Customer Developer Tester Slide 11 TEQneers GmbH & Co. KG www.teqneers.de
- 14. In order to finish a purchase we need to add VAT to the total. Customer Developer Tester Slide 12 TEQneers GmbH & Co. KG www.teqneers.de
- 15. <?php foreach( $itemList as $item) { $total += $item[price] * $item[quantity]; } $total = $sum * 1.19; ?> Customer Developer Tester Slide 13 TEQneers GmbH & Co. KG www.teqneers.de
- 16. Take all items add them up multiply by VAT total should be sum + VAT Customer Developer Tester Slide 14 TEQneers GmbH & Co. KG www.teqneers.de
- 17. Translation Slide 15 TEQneers GmbH & Co. KG www.teqneers.de
- 18. Translation Slide 16 TEQneers GmbH & Co. KG www.teqneers.de
- 19. Goal ‣ Common language ‣ Tester writing tests ‣ Customer writing specs ‣ Common dictionary ‣ Specs == Tests Slide 17 TEQneers GmbH & Co. KG www.teqneers.de
- 20. Behavior-Driven Development ‣ Writing tests first in a customer friendly language ‣ Your tests are your specifications and your specifications are your tests ‣ Dan North: “BDD takes the position that you can turn an idea for a requirement into implemented, tested, production-ready code simply and effectively, as long as the requirement is specific enough that everyone knows what’s going on.” Slide 18 TEQneers GmbH & Co. KG www.teqneers.de
- 21. Gherkin ‣ Feature: Generating an invoice ‣ Scenario: Calculating gross total in Germany ‣ Given the customer is from Germany ‣ And the net total is 100 EUR ‣ When I calculate the gross total ‣ Then the final invoice total should be 119 EUR Slide 19 TEQneers GmbH & Co. KG www.teqneers.de
- 22. Gherkin Compatible BDD Frameworks ‣ Ruby: Cucumber ‣ Java: Cucumber-JVM ‣ .NET: IronRuby ‣ Erlangen: cucumberl ‣ PHP: Behat Slide 20 TEQneers GmbH & Co. KG www.teqneers.de
- 23. Behat ‣ Extendable PHP BDD Framework ‣ Mink: browser testing (e.g. Selenium) ‣ Symfony2: integration layer ‣ Jira: bug tracker interface ‣ Gearman: distributed testing ‣ ... Slide 21 TEQneers GmbH & Co. KG www.teqneers.de
- 24. What’s testable in Behat? ‣ Business Intelligence/Models ‣ API’s ‣ Web Pages ‣ Single Scripts ‣ Server-Server-Interaction Slide 22 TEQneers GmbH & Co. KG www.teqneers.de
- 25. How does it work? Slide 23 TEQneers GmbH & Co. KG www.teqneers.de
- 26. What BDD is NOT ‣ No replacement for TDD ‣ Not a “real” spoken language ‣ Not a drop in solution ‣ Common language needs to be developed ‣ Developer still has to write glue code ‣ It’s not magic! Slide 24 TEQneers GmbH & Co. KG www.teqneers.de
- 27. Good Practice ‣ Get everyone on board ‣ Define common language and syntax ‣ Define test scope ‣ Build project specific testing environment ‣ Don’t expect perfect solution from start ‣ Don’t make it too complicated Slide 25 TEQneers GmbH & Co. KG www.teqneers.de
- 28. Questions? Slide 26 TEQneers GmbH & Co. KG www.teqneers.de
- 29. Thanks for listening contact us if you have any questions email: oliver@php.net email: stefan@teqneers.de Have Fun! Slide 27 TEQneers GmbH & Co. KG www.teqneers.de
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- No extra code, not needed\n
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- http://dannorth.net/whats-in-a-story/\n
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- extension to TDD\nNatural language=more dynamic syntax (e.g. plural)\n\n
- Syntax: I -> We, Uppercase, Tense, ...\nTest scope: API, GUI, Backend only, ...\nEnvironment: DB restore strategies, ...\nToo complicated = tests have to be tested\n
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