Replace Newsletter model with NewsletterEntity in SendingQueue

This was the easiest way to fix failing integration tests related to
updating some Sending methods to use Doctrine instead of Paris. Using
Paris in SendingQueue to update the database was creating a state where
Doctrine had stale data and this was causing the tests to fail.

[MAILPOET-4368]

mailpoet/tests/integration/Entities/SendingQueueEntityTest.php

@@ -0,0 +1,61 @@
+<?php declare(strict_types = 1);
+
+namespace integration\Entities;
+
+use MailPoet\Entities\NewsletterEntity;
+use MailPoet\Entities\ScheduledTaskEntity;
+use MailPoet\Entities\SendingQueueEntity;
+use MailPoet\Tasks\Sending;
+use MailPoet\Test\DataFactories\Newsletter as NewsletterFactory;
+use MailPoet\Test\DataFactories\ScheduledTask as ScheduledTaskFactory;
+use MailPoet\Test\DataFactories\SendingQueue as SendingQueueFactory;
+use MailPoetVendor\Carbon\Carbon;
+
+class SendingQueueEntityTest extends \MailPoetTest {
+  /** @var NewsletterEntity */
+  private $newsletter;
+
+  /** @var ScheduledTaskEntity */
+  private $scheduledTask;
+
+  /** @var SendingQueueEntity */
+  private $sendingQueue;
+
+  public function _before() {
+    $newsletterFactory = new NewsletterFactory();
+    $sendingQueueFactory = new SendingQueueFactory();
+    $scheduledTaskFactory = new ScheduledTaskFactory();
+
+    $scheduledAt = new Carbon('2018-10-10 10:00:00');
+    $this->newsletter = $newsletterFactory->create();
+    $this->scheduledTask = $scheduledTaskFactory->create(Sending::TASK_TYPE, ScheduledTaskEntity::STATUS_SCHEDULED, $scheduledAt);
+    $this->sendingQueue = $sendingQueueFactory->create($this->scheduledTask, $this->newsletter);
+    $this->assertInstanceOf(SendingQueueEntity::class, $this->sendingQueue);
+  }
+
+  public function testToArrayReturnsExpectedResult() {
+    $expectedResult = [
+      'id' => $this->sendingQueue->getId(),
+      'type' => 'sending',
+      'status' => 'scheduled',
+      'priority' => 0,
+      'scheduled_at' => '2018-10-10 10:00:00',
+      'processed_at' => null,
+      'created_at' => !is_null($this->sendingQueue->getCreatedAt()) ? $this->sendingQueue->getCreatedAt()->format('Y-m-d H:i:s') : null,
+      'updated_at' => $this->sendingQueue->getUpdatedAt()->format('Y-m-d H:i:s'),
+      'deleted_at' => null,
+      'in_progress' => null,
+      'reschedule_count' => 0,
+      'meta' => null,
+      'task_id' => $this->scheduledTask->getId(),
+      'newsletter_id' => $this->newsletter->getId(),
+      'newsletter_rendered_body' => null,
+      'newsletter_rendered_subject' => null,
+      'count_total' => 0,
+      'count_processed' => 0,
+      'count_to_process' => 0,
+    ];
+
+    $this->assertSame($expectedResult, $this->sendingQueue->toArray());
+  }
+}