test: add basic test for guest migration

Signed-off-by: Robin Appelman <robin@icewind.nl>

tests/unit/Migration/OwncloudGuestMigrationTest.php

@@ -0,0 +1,78 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace OCA\Guests\Tests\Migration;
+
+use OC\Migration\ConsoleOutput;
+use OCA\Guests\GuestManager;
+use OCA\Guests\Migration\OwncloudGuestsMigration;
+use OCA\Guests\UserBackend;
+use OCP\IConfig;
+use OCP\IUserManager;
+use OCP\Server;
+use Symfony\Component\Console\Output\BufferedOutput;
+use Test\TestCase;
+use Test\Util\User\Dummy;
+
+/**
+ * @group DB
+ */
+class OwncloudGuestMigrationTest extends TestCase {
+	private IConfig $config;
+	private IUserManager $userManager;
+	private BufferedOutput $consoleOutput;
+	private ConsoleOutput $migrationOutput;
+	private GuestManager $guestManager;
+
+	protected function setUp():void {
+		$this->config = Server::get(IConfig::class);
+		$this->userManager = Server::get(IUserManager::class);
+		$this->consoleOutput = new BufferedOutput();
+		$this->migrationOutput = new ConsoleOutput($this->consoleOutput);
+		$this->guestManager = Server::get(GuestManager::class);
+
+		parent::setUp();
+	}
+
+	private function createOcGuest(string $userId): void {
+		$this->userManager->createUser($userId, $userId . '_password');
+		$this->config->setUserValue($userId, 'owncloud', 'isGuest', '1');
+	}
+
+	public function testMigrateNoGuests(): void {
+		$migration = Server::get(OwncloudGuestsMigration::class);
+
+		$migration->run($this->migrationOutput);
+		$this->assertEmpty($this->consoleOutput->fetch());
+
+		$this->assertEmpty($this->guestManager->listGuests());
+	}
+
+	public function testMigrateSingleGuest(): void {
+		$this->createOcGuest('test@example.com');
+		$this->assertEmpty($this->guestManager->listGuests());
+
+		$migration = Server::get(OwncloudGuestsMigration::class);
+
+		$migration->run($this->migrationOutput);
+		$this->assertNotEmpty($this->consoleOutput->fetch());
+
+		// clear the backend-cache
+		$this->userManager->removeBackend(new Dummy());
+
+		/** @var $guests */
+		$guests = $this->guestManager->listGuests();
+		$this->assertCount(1, $guests);
+		$this->assertEquals('test@example.com', $guests[0]);
+
+		$user = $this->userManager->get('test@example.com');
+		$this->assertInstanceOf(UserBackend::class, $user->getBackend());
+		$this->userManager->checkPassword('test@example.com', 'test@example.com_password');
+	}
+}