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Encourage TDD
With PHP-VCR
Ryo Tomidokoro
PHP Study 2019/2/27
@hanhan1978
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PHP-VCR?
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https://php-vcr.github.io/
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VCR?
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Video Casset Recorder
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How to Use
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PHP-VCR | Record HTTP interactions while testing
https://php-vcr.github.io/
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Record Response
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Request & Response
Recorded as YML
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Replace API-Request to PHP-VCR
-> Easy way to tests HTTP Request.
-> Faster than actual HTTP Request.
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When to Use
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Let’s say you have a legacy app
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Legacy App
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Replace external API with PHP-VCR
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Legacy App now becomes testable
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But, wait
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Shouldn’t we use mock?
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Desired Architecture
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Of course we prefer mock
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A chiken or egg situation
- Loosely coupled architecture is desirable
- Legacy app have a long way to achieve it
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No tests until good architecture?
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Yes
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Test First
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Create tests for the legacy app with PHP-VCR
It’s will support your refactoring until you
achive your desirable architecture.
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How to Bent Wood | Ahoy!
http://www.ventspleen.com/how-to-bend-wood/
It’s a jig for a legacy app
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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.
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Precaution
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Needs soap extension
Example setup for CircleCI 2.0
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Headers match may be too strict
Development environment & CI environment might use
slightly diffrent version of UserAgent.
Ignore strict headers match at this situation.
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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.
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How PHP-VCR record Requests?
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stream_wapper_register
http://php.net/manual/en/function.stream-wrapper-register.php
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Example
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HTTP Request
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HTTP Response
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Capture HTTP Request
&
Replace Response
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No content
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Replaced Response
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Summary
PHP-VCR allows you to write tests for
legacy Apps.
Use ‘Test Fast’ approach to improve the
software architecture
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Thanks!!
@hanhan1978
https://blog.hanhans.net
Ryo Tomidokoro