News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Sebastian Bergmann's Blog:
Testing Code That Uses Singletons
February 12, 2010 @ 11:28:45

Sebastian Bergmann has written up a post for his blog recently that looks at unit testing singletons, something that's been rumored as being some of the hardest to test.

I frequently quote Miško Hevery with "It is hard to test code that uses singletons." And then my audience asks me... Why is it hard to test code that uses singletons? Lets have a look at the default implementation of the Singleton design pattern in PHP.

He defines a singleton first, showing how it's used to create single instances of objects and, because of this, cannot be tested easily because there's no way to know you're getting a clean instance every time. Dependency injection can help with the problem by allowing you to pass in a "mock" instance of the singleton class each time. He also mentions some variations on singletons that could make it easier to test in the future.

0 comments voice your opinion now!
singleton unittest technique dependency injection


blog comments powered by Disqus

Similar Posts

Kevin Schroeder: (Starting) Using Dependency Injection in Magento 2

HHVM Blog: Tracking Parity

Sebastian Bergmann's Blog: German Article on PHPUnit 3

Fabien Potencier's Blog: On PHP 5.3, Lambda Functions, and Closures

Jemjabella.co.uk: Spotting Insecure Scripts


Community Events





Don't see your event here?
Let us know!


composer artisanfiles version framework opinion tool introduction laravel interview symfony language community conference list series voicesoftheelephpant podcast security release library

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework