Behavior driven development
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Behavior-Driven Development in PHP with Behat BDD framework
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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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