ZF2 / PHPUnit: Mock a Zend/Db/Adapter/Adapter for further usage

问题

The goal: Unit test an InputFilter in Zend Framework 2.

The problem: A mocked DbAdapter is needed.

As I am relatively new to Unit Testing I just got started with mocking classes. After doing a lot of research I'm still unable to find a proper solution for my problem so here we go with my filter to start things off:

class ExampleFilter extends Inputfilter
{
    protected $dbAdapter;

    public function __construct(AdapterInterface $dbAdapter)
    {
        $this->dbAdapter = $dbAdapter;
    }

    public function init()
    {
        $this->add(
            [
                'name' => 'example_field',
                'required' => true,
                'filters' => [
                    ['name' => 'StringTrim'],
                    ['name' => 'StripTags'],
                ],
                'validators' => [
                    [
                        'name'    => 'Db\NoRecordExists',
                        'options' => [
                            'adapter' => $this->dbAdapter,
                            'table' => 'example_table',
                            'field' => 'example_field',
                        ],
                    ],
                ],
            ]
        );
    }
}

Without the need of an adapter, testing this filter would be rather easy. My problem is to create the Filter in my TestClass as seen here:

class ExampleFilterTest extends \PHPUnit_Framework_TestCase
{
    protected $exampleFilter;
    protected $mockDbAdapter;

    public function setUp()
    {
        $this->mockDbAdapter = $this->getMockBuilder('Zend\Db\Adapter')
            ->disableOriginalConstructor()
            ->getMock();
        $this->exampleFilter = new ExampleFilter($this->mockDbAdapter);
    }

}

When creating the filter like this the ExampleFilter class will end up saying that I did provide a wrong class to its constructor. It's receiving a mock object when expecting one of type Zend\Db\Adapter\Adapter.

I could create a real adapter of course but I want to avoid performing actual queries to the database as it is a unit test and this would go far beyond the border of my unit to test.

Can anyone tell me how I can achieve my goal of testing the filter with a mocked DbAdapter?

回答1:

Well... As I was commenting on gontrollez hint I already smelled my mistake. I had to create a mock of 'Zend/Db/Adapter/AdapterInterface' instead of just '/Zend/Db/Adapter'.

Thanks for bringing me on the right path anyway gontrollez :)

来源：https://stackoverflow.com/questions/34225052/zf2-phpunit-mock-a-zend-db-adapter-adapter-for-further-usage