Fix server ctor including unit test - this shall never happen again

apps/dav/lib/server.php

@@ -81,7 +81,7 @@ class Server {
 		$this->server->addPlugin(new IMipPlugin($mailer, $logger));
 		$this->server->addPlugin(new \Sabre\CalDAV\Subscriptions\Plugin());
 		$this->server->addPlugin(new \Sabre\CalDAV\Notifications\Plugin());
-		$this->server->addPlugin(new CardDAV\Sharing\Plugin($authBackend, \OC::$server->getRequest()));
+		$this->server->addPlugin(new DAV\Sharing\Plugin($authBackend, \OC::$server->getRequest()));
 
 		// addressbook plugins
 		$this->server->addPlugin(new \OCA\DAV\CardDAV\Plugin());

apps/dav/tests/unit/servertest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace OCA\DAV\Tests\Unit;
+
+use OCA\DAV\Server;
+use OCP\IRequest;
+
+/**
+ * Class ServerTest
+ *
+ * @group DB
+ *
+ * @package OCA\DAV\Tests\Unit
+ */
+class ServerTest extends \Test\TestCase {
+
+	public function test() {
+		/** @var IRequest $r */
+		$r = $this->getMockBuilder('\OCP\IRequest')
+			->disableOriginalConstructor()->getMock();
+		$s = new Server($r, '/');
+		$this->assertNotNull($s->server);
+	}
+}