How to replace class with mock in DI? Phalcon + Codeception - dependency-injection

Question

I try writing functional tests for my controllers using Codeception testing framework. I want to replace real service in DI with fake one.
Controller code example:
<?php
namespace App\Controllers;
class IndexController extends ControllerBase
{
public function indexAction()
{
// some logic here
$service = $this->getDI()->get('myService');
$service->doSomething();
// some logic here
}
}
Test code example:
<?php
namespace App\Functional;
class IndexControllerCest
{
public function testIndexAction(FunctionalTester $I)
{
// Here i want to mock myService, replace real object that in controller with fake one
$I->amOnRoute('index.route');
}
}
I already try different combinations with Codeception Phalcon module like addServiceToContainer.
I setup Codeception using bootstrap.php file almost the same as for real app.
Phalcon version: 3.4.1
Codeception version: 3.1
So my question in last code fragment on comment section. Thank you for any help.

Answer 1

I would like suggest you start from creating a separated helpers to create and inject dependencies as follows:
# functional.suite.yml
class_name: FunctionalTester
modules:
enabled:
- Helper\MyService
- Phalcon:
part: services
# path to the bootstrap
bootstrap: 'app/config/bootstrap.php'
# Another modules ...
Create a separated service:
<?php
namespace Helper;
use Codeception\Module;
/** #var \Codeception\Module\Phalcon */
protected $phalcon;
class MyService extends Module
{
public function _initialize()
{
$this->phalcon = $this->getModule('Phalcon');
}
public function haveMyServiceInDi()
{
$this->phalcon->addServiceToContainer(
'myService',
['className' => '\My\Awesome\Service']
);
}
}
And use it in tests as follows:
<?php
namespace App\Functional;
use Helper\MyService;
class IndexControllerCest
{
/** #var MyService */
protected $myService;
protected function _inject(MyService $myService)
{
$this->myService = $myService;
}
public function testIndexAction(FunctionalTester $I)
{
$I->wantTo(
'mock myService, replace real object that in controller with fake one'
);
$this->myService->haveMyServiceInDi();
$I->amOnRoute('index.route');
}
}