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copied!<p>Normally in our apps, we do constructor injection and define an interface for all components in our system:</p> <pre><code>class Book { /** * @var Db_AdapterInterface */ private $_database; public function __construct(Db_AdapterInterface $database) { $this->_database = $database; } } </code></pre> <p>We have then of course a standard Db_Adapter and then another Db_TestAdapter. In Db_TestAdapter we can define results of SQL queries in our tests.</p> <p>For our normal app, we have something like this for our container:</p> <pre><code>$container->add('Db_AdapterInterface', new Db_Adapter()); </code></pre> <p>And then in our tests, we have this line instead:</p> <pre><code>$container->add('Db_AdapterInterface', new Db_TestAdapter()); </code></pre> <p>To get an instance of a Book, we simply ask the container for it:</p> <pre><code>$book = $container->construct('Book'); </code></pre> <p>And the container injects all the needed dependencies into the object.</p> <p>If you keep all your objects loosely coupled, ie object A only needs an interface B then you can always provide object A with a test implementation. At that point what container you use doesn't matter.</p> <p>We have a very simple IoC container which can do basic constructor injection. Our tests inherit from a base class which fills the container with standard test objects. That way we don't have a lot of code just to construct an object we want to test.</p> <p><strong>Update:</strong> I added an example of wiring things up in the container.</p>

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