diff --git a/tests/lib/files/storage/storage.php b/tests/lib/files/storage/storage.php
index 155a99d8ba..4a3a0c40e0 100644
--- a/tests/lib/files/storage/storage.php
+++ b/tests/lib/files/storage/storage.php
@@ -129,6 +129,16 @@ abstract class Storage extends \PHPUnit_Framework_TestCase {
 		$this->assertTrue($this->instance->file_exists('/target2.txt'));
 		$this->assertFalse($this->instance->file_exists('/source.txt'));
 		$this->assertEquals(file_get_contents($textFile), $this->instance->file_get_contents('/target.txt'));
+
+		// check if it's working inside directories as well
+		$this->instance->mkdir('/folder');
+		$this->instance->file_put_contents('/folder/lorem.txt', $sourceText);
+		$this->assertFalse($this->instance->is_dir('/folder/lorem.txt'));
+		$this->assertEquals($sourceText, $this->instance->file_get_contents('/folder/lorem.txt'), 'data returned from file_get_contents is not equal to the source data');
+		$this->instance->file_put_contents('/folder/lorem.txt', '');
+		$this->assertEquals('', $this->instance->file_get_contents('/folder/lorem.txt'), 'file not emptied');
+		$this->instance->rmdir('/folder');
+		$this->assertFalse($this->instance->file_exists('/folder/lorem.txt'));
 	}
 
 	public function testLocal() {