(PHP)Unit testing with dependency injection (DI)

Question

Over the past few days i read a lot about Dependency Injection. Now since I am trying to upgrade my phpunit skills i was thinking how to implement this DI. in my unit tests.

Say I have two objects:

class Event{
}

class Shift{
    public function __construct(Event $e)
    {
        (...)
    }
}

This how i essentially understand DI. Now I want to write a test for my shift constructor:

class ShiftTest extends
    \ModelTestCase
{
    public function testCanCreateShift()
    {
        $e = new \Js\Entity\Event();
        $this->assertInstanceOf('JS\Entity\Shift', new \JS\Entity\Shift($e));
    }
}

But now i dont want to define here a complete event object. So what is the adviced way to create my event object in phpUnit?

(reference) phpunit.de/manual/current/en/test-doubles.html — Gordon
– Gordon, Commented Oct 9, 2011 at 10:25

blockhead · Accepted Answer · 2011-10-09 10:22:59Z

3

This is what mocks, stubs. etc. are used for. You create a SUT (system under test), and mock out all dependencies. You wouldn't be able to do this without DI in the first place.

answered Oct 9, 2011 at 10:22

blockhead

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2 Comments

sanders Over a year ago

But should i use a stub or a mock?

blockhead Over a year ago

The biggest difference is that stubs test state (ie., after I do x, the state of y will be z), and mocks test behavior (ie., if I do x, y will happen). This is formidable article on the subject: martinfowler.com/articles/mocksArentStubs.html

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