Test the symfony adapter

To prevent regression in the future.

And make sure we always return an object …

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

lib/private/EventDispatcher/EventDispatcher.php

@@ -81,6 +81,9 @@ class EventDispatcher implements IEventDispatcher {
 		$this->addListener($eventName, $listener, $priority);
 	}
 
+	/**
+	 * @deprecated
+	 */
 	public function dispatch(string $eventName,
 							 Event $event): void {
 		$this->dispatcher->dispatch($event, $eventName);

lib/private/EventDispatcher/SymfonyAdapter.php

@@ -87,7 +87,8 @@ class SymfonyAdapter implements EventDispatcherInterface {
 
 		// Event with no payload (object) need special handling
 		if ($newEvent === null) {
-			return $this->eventDispatcher->getSymfonyDispatcher()->dispatch($eventName);
+			$this->eventDispatcher->getSymfonyDispatcher()->dispatch($eventName);
+			return new Event();
 		}
 
 		// Flip the argument order for Symfony to prevent a trigger_error

tests/lib/EventDispatcher/SymfonyAdapterTest.php

@@ -0,0 +1,155 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * @copyright 2021 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2021 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace lib\EventDispatcher;
+
+use OC\EventDispatcher\EventDispatcher;
+use OC\EventDispatcher\GenericEventWrapper;
+use OC\EventDispatcher\SymfonyAdapter;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\GenericEvent;
+use OCP\ILogger;
+use PHPUnit\Framework\MockObject\MockObject;
+use Symfony\Component\EventDispatcher\Event as SymfonyEvent;
+use Symfony\Component\EventDispatcher\EventDispatcher as SymfonyDispatcher;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\GenericEvent as SymfonyGenericEvent;
+use Test\TestCase;
+
+class SymfonyAdapterTest extends TestCase {
+
+	/** @var EventDispatcher|MockObject */
+	private $eventDispatcher;
+
+	/** @var ILogger|MockObject */
+	private $logger;
+
+	/** @var EventDispatcherInterface */
+	private $adapter;
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->eventDispatcher = $this->createMock(EventDispatcher::class);
+		$this->logger = $this->createMock(ILogger::class);
+
+		$this->adapter = new SymfonyAdapter(
+			$this->eventDispatcher,
+			$this->logger
+		);
+	}
+
+	public function testDispatchTypedEvent(): void {
+		$event = new Event();
+		$eventName = 'symfony';
+		$this->eventDispatcher->expects(self::once())
+			->method('dispatch')
+			->with(
+				$eventName,
+				$event
+			)
+			->willReturnArgument(0);
+
+		$this->adapter->dispatch($eventName, $event);
+	}
+
+	public function testDispatchSymfonyGenericEvent(): void {
+		$eventName = 'symfony';
+		$event = new SymfonyGenericEvent();
+		$wrapped = new GenericEventWrapper(
+			$this->logger,
+			$eventName,
+			$event
+		);
+		$symfonyDispatcher = $this->createMock(SymfonyDispatcher::class);
+		$this->eventDispatcher->expects(self::once())
+			->method('getSymfonyDispatcher')
+			->willReturn($symfonyDispatcher);
+		$symfonyDispatcher->expects(self::once())
+			->method('dispatch')
+			->with(
+				self::equalTo($wrapped),
+				$eventName
+			)
+			->willReturnArgument(0);
+
+		$result = $this->adapter->dispatch($eventName, $event);
+
+		self::assertEquals($result, $wrapped);
+	}
+
+	public function testDispatchOldSymfonyEvent(): void {
+		$event = new SymfonyEvent();
+		$eventName = 'symfony';
+		$symfonyDispatcher = $this->createMock(SymfonyDispatcher::class);
+		$this->eventDispatcher->expects(self::once())
+			->method('getSymfonyDispatcher')
+			->willReturn($symfonyDispatcher);
+		$symfonyDispatcher->expects(self::once())
+			->method('dispatch')
+			->with(
+				$event,
+				$eventName
+			)
+			->willReturnArgument(0);
+
+		$result = $this->adapter->dispatch($eventName, $event);
+
+		self::assertSame($result, $event);
+	}
+
+	public function testDispatchCustomGenericEvent(): void {
+		$event = new GenericEvent();
+		$eventName = 'symfony';
+		$this->eventDispatcher->expects(self::once())
+			->method('dispatch')
+			->with(
+				$eventName,
+				$event
+			);
+
+		$result = $this->adapter->dispatch($eventName, $event);
+
+		self::assertSame($result, $event);
+	}
+
+	public function testDispatchEventWithoutPayload(): void {
+		$eventName = 'symfony';
+		$symfonyDispatcher = $this->createMock(SymfonyDispatcher::class);
+		$this->eventDispatcher->expects(self::once())
+			->method('getSymfonyDispatcher')
+			->willReturn($symfonyDispatcher);
+		$symfonyDispatcher->expects(self::once())
+			->method('dispatch')
+			->with(
+				$eventName
+			)
+			->willReturnArgument(0);
+
+		$result = $this->adapter->dispatch($eventName);
+
+		self::assertNotNull($result);
+	}
+}