Fix tests: createCard() may return an URI (no full URL) handle it

The accounts used by the test setup lack a base URL, thus an URI that
lacks the protocol/server part cannot be completed.

tests/interop/AddressbookCollectionTest.php

@@ -141,6 +141,7 @@ public function testCanCreateWebDavResourceForNonCollection(string $abookname, a
         $this->assertInstanceOf(AddressbookCollection::class, $abook);
         $this->assertArrayHasKey($abookname, self::$insertedCards);
         $cardUri = self::$insertedCards[$abookname]['uri'];
+        $cardUri = TestInfrastructure::normalizeUri($abook, $cardUri);
 
         $resource = WebDavResource::createInstance($cardUri, $abook->getAccount());
         $this->assertSame(WebDavResource::class, get_class($resource));