fix tests

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/Files/Mount/MountPoint.php

@@ -196,11 +196,15 @@ class MountPoint implements IMountPoint {
 	}
 
 	/**
-	 * @return string
+	 * @return string|null
 	 */
 	public function getStorageId() {
 		if (!$this->storageId) {
-			$this->storageId = $this->getStorage()->getId();
+			$storage = $this->getStorage();
+			if (is_null($storage)) {
+				return null;
+			}
+			$this->storageId = $storage->getId();
 			if (strlen($this->storageId) > 64) {
 				$this->storageId = md5($this->storageId);
 			}
@@ -213,7 +217,11 @@ class MountPoint implements IMountPoint {
 	 */
 	public function getNumericStorageId() {
 		if (is_null($this->numericStorageId)) {
-			$this->numericStorageId = $this->getStorage()->getStorageCache()->getNumericId();
+			$storage = $this->getStorage();
+			if (is_null($storage)) {
+				return -1;
+			}
+			$this->numericStorageId = $storage->getStorageCache()->getNumericId();
 		}
 		return $this->numericStorageId;
 	}

lib/public/Files/Mount/IMountPoint.php

@@ -55,7 +55,7 @@ interface IMountPoint {
 	/**
 	 * Get the id of the storages
 	 *
-	 * @return string
+	 * @return string|null
 	 * @since 8.0.0
 	 */
 	public function getStorageId();
@@ -63,7 +63,7 @@ interface IMountPoint {
 	/**
 	 * Get the id of the storages
 	 *
-	 * @return int
+	 * @return int|null
 	 * @since 9.1.0
 	 */
 	public function getNumericStorageId();

tests/lib/Files/ViewTest.php

@@ -1590,6 +1590,9 @@ class ViewTest extends \Test\TestCase {
 				->setConstructorArgs([[]])
 				->getMock();
 			$storage->method('getId')->willReturn('non-null-id');
+			$storage->method('getStorageCache')->willReturnCallback(function () use ($storage) {
+				return new \OC\Files\Cache\Storage($storage);
+			});
 
 			$mounts[] = $this->getMockBuilder(TestMoveableMountPoint::class)
 				->setMethods(['moveMount'])