do not remove the method and only keep the tests

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

apps/files_sharing/lib/Cache.php

@@ -71,6 +71,14 @@ class Cache extends CacheJail {
 		return $this->cache;
 	}
 
+	public function getNumericStorageId() {
+		if (isset($this->numericId)) {
+			return $this->numericId;
+		} else {
+			return false;
+		}
+	}
+
 	public function get($file) {
 		if ($this->rootUnchanged && ($file === '' || $file === $this->sourceRootInfo->getId())) {
 			return $this->formatCacheEntry(clone $this->sourceRootInfo);