Added getLabel() helper function

tests/OfflineTests/NodeReaderMockTest.php

@@ -126,6 +126,15 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
         $this->assertEquals('coid://cloudobjects.io/Public', $object->getNode('co:isVisibleTo')->getId());
     }
 
+    public function testConstants() {
+        $coid = new IRI('coid://cloudobjects.io');
+        $this->useRootResourceMock();
+        $object = $this->retriever->getCloudObject($coid);
+
+        $this->assertEquals('6-fbea0c90b2c5e5300e4039ed99be9b2d', $object->getRevision());
+        $this->assertEquals('CloudObjects', $object->getLabel());
+    }
+
     public function testGetAllValuesString1() {
         $coid = new IRI('coid://cloudobjects.io');
         $this->useRootResourceMock();