public function testSubscriptions()
{
$id = $this->backend->createSubscription(self::UNIT_TEST_USER, 'Subscription', ['{http://calendarserver.org/ns/}source' => new Href('test-source')]);
$subscriptions = $this->backend->getSubscriptionsForUser(self::UNIT_TEST_USER);
$this->assertEquals(1, count($subscriptions));
$this->assertEquals($id, $subscriptions[0]['id']);
$patch = new PropPatch(['{DAV:}displayname' => 'Unit test']);
$this->backend->updateSubscription($id, $patch);
$patch->commit();
$subscriptions = $this->backend->getSubscriptionsForUser(self::UNIT_TEST_USER);
$this->assertEquals(1, count($subscriptions));
$this->assertEquals($id, $subscriptions[0]['id']);
$this->assertEquals('Unit test', $subscriptions[0]['{DAV:}displayname']);
$this->backend->deleteSubscription($id);
$subscriptions = $this->backend->getSubscriptionsForUser(self::UNIT_TEST_USER);
$this->assertEquals(0, count($subscriptions));
}