Encourage TDD with PHP-VCR

Transcript

1. Encourage TDD With PHP-VCR Ryo Tomidokoro PHP Study 2019/2/27 @hanhan1978

2. PHP-VCR?

3. https://php-vcr.github.io/

4. VCR?

5. Video Casset Recorder

6. How to Use

7. PHP-VCR | Record HTTP interactions while testing https://php-vcr.github.io/

8. Record Response

9. Request & Response Recorded as YML

10. Replace API-Request to PHP-VCR -> Easy way to tests HTTP

    Request. -> Faster than actual HTTP Request.

11. When to Use

12. Let’s say you have a legacy app

13. Legacy App

14. Replace external API with PHP-VCR

15. Legacy App now becomes testable

16. But, wait

17. Shouldn’t we use mock?

18. Desired Architecture

19. Of course we prefer mock

20. A chiken or egg situation - Loosely coupled architecture is

    desirable - Legacy app have a long way to achieve it

21. No tests until good architecture?

22. Yes

23. Test First

24. Create tests for the legacy app with PHP-VCR It’s will

    support your refactoring until you achive your desirable architecture.

25. How to Bent Wood | Ahoy! http://www.ventspleen.com/how-to-bend-wood/ It’s a jig

    for a legacy app

26. When refactoring ends - You can choose wheather to use

    Mock or PHP-VCR - PHP-VCR is a great tool guiding you to achieve a better software architecture.

27. Precaution

28. Needs soap extension Example setup for CircleCI 2.0

29. Headers match may be too strict Development environment & CI

    environment might use slightly diffrent version of UserAgent. Ignore strict headers match at this situation.

30. curl_getinfo is not recorded (yet) https://github.com/php-vcr/php-vcr/pull/210 It’s in PR, but

    not yet merged. Using curl_getinfo, PHP-VCR will not work.

31. How PHP-VCR record Requests?

32. stream_wapper_register http://php.net/manual/en/function.stream-wrapper-register.php

33. Example

34. HTTP Request

35. HTTP Response

36. Capture HTTP Request & Replace Response

37. None

38. Replaced Response

39. Summary PHP-VCR allows you to write tests for legacy Apps.

    Use ‘Test Fast’ approach to improve the software architecture

40. Thanks!! @hanhan1978 https://blog.hanhans.net Ryo Tomidokoro