Unit tests failing when I use a custom view helper in the layout - phpunit

Question

So I have created my custom view helper and used it in layout.phtml like this:
<?php echo $this->applicationBar(); ?>
It is working flawlessly in the browser but my unit tests that were working before are failing now:
1) UnitTests\Application\Controller\IndexControllerTest::testIndexActionCanBeAccessed
Zend\ServiceManager\Exception\ServiceNotFoundException: Zend\ServiceManager\ServiceManager::get was unable to fetch or create an instance for applicationBar
When I comment out the view helper in the layout file, test passes again.

Answer 1

I have the same problem, and i solved it in not a good way (but it solved for my specific problem).
The phpunit tests is not finding my factories view helpers, but it is finding my invokables. Then, i did the following:
public function getViewHelperConfig() {
return array(
'factories' => array(
'aplicationBar' => function($service) {
$applicationBar = new ApplicationBar();
return $applicationBar;
},
),
'invokables' => array(
'applicationBar' => 'Application\View\Helper\ApplicationBar',
),
);
When i use the browser, it uses the correct Factory. When i use phpunit, it uses the invokables.
The problem happens when i need to set some parameters. And then, i set some default parameters, that will be used only by phpunit.
namespace Application\View\Helper;
use Zend\View\Helper\AbstractHelper;
class ApplicationBar extends AbstractHelper {
protected $parameter;
public function __construct($parameter = 'something') {
$this->parameter = $parameter;
}
public function __invoke() {
return $this->parameter;
}
}
It is not the best solution, but if i solve it in a better way, i will post here.