Deal with 'new' keyword in PHP unit test - php

Question

In my case I have a class such as:
class Logger
{
/**
* #var EntityManager
*/
protected $entityManager;
public function __construct(EntityManager $entityManager)
{
$this->entityManager = $entityManager;
}
/**
* #param Model $model
*/
public function log(Model $model)
{
$logEntity = new LogEntity();
$logEntity->setOrder($model->getOrder());
$logEntity->setType($model->getType());
$logEntity->setScore($model->getScore());
$logEntity->setCreated(new DateTime());
$logEntity->setModified(new DateTime());
$this->entityManager->persist($logEntity);
$this->entityManager->flush();
return $logEntity;
}
Logger class is not testable because in my code 'new' keyword exists, in other hand Logger class and EntityManager class registered singleton in container and can't inject model as dependency.
How to change class for change to testable class?
LoggerModel is a Doctrine entity and use in Laravel framework.

Answer 1

I solve this problem with a sample solution: Factory Pattern.
I need assertion, so when get a new model from factory assert it as mock.
And how?
I create a class with a method that can be a singleton service:
class LogFactory
{
public function makeLogEntity()
{
return new LogEntity();
}
}
In another service, inject factory class:
class Logger
{
/**
* #var EntityManager
*/
protected $entityManager;
/**
* #var LogFactory
*/
protected $logFactory;
public function __construct(EntityManager $entityManager, LogFactory $logFactory)
{
$this->entityManager = $entityManager;
$this->logFactory = $logFactory
}
/**
* #param Model $model
*/
public function log(Model $model)
{
$logEntity = $this->logFactory->makeLogEntity();
$logEntity->setOrder($model->getOrder());
$logEntity->setType($model->getType());
$logEntity->setScore($model->getScore());
$logEntity->setCreated(new DateTime());
$logEntity->setModified(new DateTime());
$this->entityManager->persist($logEntity);
$this->entityManager->flush();
return $logEntity;
}
Now I have a service that is mock able and call $mock->willReturn() function in test.