fix: Add unit test for occ app:update command

In preparation for changes in the process, add a test for the command.

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

tests/Core/Command/App/UpdateTest.php

@@ -0,0 +1,97 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Tests\Core\Command\App;
+
+use OC\Core\Command\App\Update;
+use OC\Installer;
+use OCP\App\IAppManager;
+use PHPUnit\Framework\MockObject\MockObject;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Test\TestCase;
+
+class UpdateTest extends TestCase {
+	private IAppManager&MockObject $appManager;
+	private Installer&MockObject $installer;
+	private LoggerInterface&MockObject $logger;
+	private InputInterface&MockObject $inputInterface;
+	private OutputInterface&MockObject $outputInterface;
+
+	protected Update $command;
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->appManager = $this->createMock(IAppManager::class);
+		$this->installer = $this->createMock(Installer::class);
+		$this->logger = $this->createMock(LoggerInterface::class);
+		$this->inputInterface = $this->createMock(InputInterface::class);
+		$this->outputInterface = $this->createMock(OutputInterface::class);
+
+		$this->command = new Update(
+			$this->appManager,
+			$this->installer,
+			$this->logger,
+		);
+	}
+
+	public function testAppUpdateNoUpdatesFound(): void {
+		$this->inputInterface->expects(self::once())
+			->method('getArgument')
+			->with('app-id')
+			->willReturn('fakeid');
+
+		$this->outputInterface->expects(self::once())
+			->method('writeln')
+			->with('fakeid is up-to-date or no updates could be found');
+
+		$this->assertEquals(0, self::invokePrivate($this->command, 'execute', [$this->inputInterface, $this->outputInterface]));
+	}
+
+	public function testAppUpdate(): void {
+		$this->inputInterface->expects(self::once())
+			->method('getArgument')
+			->with('app-id')
+			->willReturn('fakeid');
+		$this->inputInterface->expects(self::any())
+			->method('getOption')
+			->willReturnMap([
+				['allow-unstable', false],
+				['showonly', false],
+			]);
+
+		$this->installer->expects(self::once())
+			->method('isUpdateAvailable')
+			->willReturn('fakeversion');
+		$this->installer->expects(self::once())
+			->method('updateAppstoreApp')
+			->with('fakeid', false)
+			->willReturn(true);
+
+		$output = [];
+		$this->outputInterface->expects(self::any())
+			->method('writeln')
+			->willReturnCallback(
+				function (string $line) use (&$output) {
+					$output[] = $line;
+				}
+			);
+
+		$this->assertEquals(0, self::invokePrivate($this->command, 'execute', [$this->inputInterface, $this->outputInterface]));
+		$this->assertEquals(
+			[
+				'fakeid new version available: fakeversion',
+				'fakeid updated',
+			],
+			$output
+		);
+	}
+}