Refactor Forms::trash() to use Doctrine

[MAILPOET-3039]

tests/integration/Form/FormsRepositoryTest.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace MailPoet\Form;
+
+use MailPoet\Entities\FormEntity;
+
+class FormsRepositoryTest extends \MailPoetTest {
+  /** @var FormsRepository */
+  private $repository;
+
+  public function _before() {
+    parent::_before();
+    $this->repository = $this->diContainer->get(FormsRepository::class);
+  }
+
+  public function testItCanTrashForm() {
+    $form = $this->createForm('Form 1');
+    expect($form->getDeletedAt())->null();
+    $this->repository->trash($form);
+    expect($form->getDeletedAt())->notNull();
+  }
+
+  public function _after() {
+    $this->truncateEntity(FormEntity::class);
+  }
+
+  private function createForm(string $name): FormEntity {
+    $form = new FormEntity($name);
+    $this->repository->persist($form);
+    $this->repository->flush();
+    return $form;
+  }
+}