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diff --git a/apps/files_versions/tests/Versions/VersionManagerTest.php b/apps/files_versions/tests/Versions/VersionManagerTest.php
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+++ b/apps/files_versions/tests/Versions/VersionManagerTest.php
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+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019 Robin Appelman <robin@icewind.nl>
+ *
+ * @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 OCA\files_versions\tests\Versions;
+
+use OC\Files\Storage\Local;
+use OCA\Files_Versions\Versions\IVersionBackend;
+use OCA\Files_Versions\Versions\VersionManager;
+use OCP\Files\Storage\IStorage;
+use Test\TestCase;
+
+class VersionManagerTest extends TestCase {
+	private function getBackend(bool $shouldUse = true): IVersionBackend {
+		$backend = $this->createMock(IVersionBackend::class);
+		$backend->method('useBackendForStorage')
+			->willReturn($shouldUse);
+		return $backend;
+	}
+
+	private function getStorage(string $class): IStorage {
+		return $this->getMockBuilder($class)
+			->disableOriginalConstructor()
+			->setMethodsExcept(['instanceOfStorage'])
+			->getMock();
+	}
+
+	public function testGetBackendSingle() {
+		$manager = new VersionManager();
+		$backend = $this->getBackend();
+		$manager->registerBackend(IStorage::class, $backend);
+
+		$this->assertEquals($backend, $manager->getBackendForStorage($this->getStorage(Local::class)));
+	}
+
+	public function testGetBackendMoreSpecific() {
+		$manager = new VersionManager();
+		$backend1 = $this->getBackend();
+		$backend2 = $this->getBackend();
+		$manager->registerBackend(IStorage::class, $backend1);
+		$manager->registerBackend(Local::class, $backend2);
+
+		$this->assertEquals($backend2, $manager->getBackendForStorage($this->getStorage(Local::class)));
+	}
+
+	public function testGetBackendNoUse() {
+		$manager = new VersionManager();
+		$backend1 = $this->getBackend();
+		$backend2 = $this->getBackend(false);
+		$manager->registerBackend(IStorage::class, $backend1);
+		$manager->registerBackend(Local::class, $backend2);
+
+		$this->assertEquals($backend1, $manager->getBackendForStorage($this->getStorage(Local::class)));
+	}
+
+	public function testGetBackendMultiple() {
+		$manager = new VersionManager();
+		$backend1 = $this->getBackend();
+		$backend2 = $this->getBackend(false);
+		$backend3 = $this->getBackend();
+		$manager->registerBackend(IStorage::class, $backend1);
+		$manager->registerBackend(Local::class, $backend2);
+		$manager->registerBackend(Local::class, $backend3);
+
+		$this->assertEquals($backend3, $manager->getBackendForStorage($this->getStorage(Local::class)));
+	}
+}