test: add test for nested cache jail unjailedroot

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

lib/private/Files/Cache/Wrapper/CacheJail.php

@@ -50,7 +50,7 @@ class CacheJail extends CacheWrapper {
 	 *
 	 * @return string
 	 */
-	protected function getGetUnjailedRoot() {
+	public function getGetUnjailedRoot() {
 		return $this->unjailedRoot;
 	}
 

tests/lib/Files/Cache/Wrapper/CacheJailTest.php

@@ -8,6 +8,7 @@
 namespace Test\Files\Cache\Wrapper;
 
 use OC\Files\Cache\Wrapper\CacheJail;
+use OC\Files\Cache\Wrapper\CacheWrapper;
 use OC\Files\Search\SearchComparison;
 use OC\Files\Search\SearchQuery;
 use OC\Files\Storage\Wrapper\Jail;
@@ -252,4 +253,14 @@ class CacheJailTest extends CacheTest {
 		$storage->getWatcher()->update('bar', ['mimetype' => 'text/plain']);
 		$this->assertTrue($this->cache->inCache('bar'));
 	}
+
+	public function testUnJailedRoot(): void {
+		$jail1 = new CacheJail($this->sourceCache, 'foo');
+		$jail2 = new CacheJail($jail1, 'bar');
+		$this->assertEquals('foo/bar', $jail2->getGetUnjailedRoot());
+
+		$middleWrapper = new CacheWrapper($jail1);
+		$jail3 = new CacheJail($middleWrapper, 'bar');
+		$this->assertEquals('foo/bar', $jail3->getGetUnjailedRoot());
+	}
 }