diff --git a/tests/lib/helper.php b/tests/lib/helper.php
index 336e8f8b3c..6acb0dfaa6 100644
--- a/tests/lib/helper.php
+++ b/tests/lib/helper.php
@@ -67,6 +67,15 @@ class Test_Helper extends PHPUnit_Framework_TestCase {
 		$this->assertEquals($result, $expected);
 	}
 
+	function testGetFileNameMimeType() {
+		$this->assertEquals('text/plain', OC_Helper::getFileNameMimeType('foo.txt'));
+		$this->assertEquals('image/png', OC_Helper::getFileNameMimeType('foo.png'));
+		$this->assertEquals('image/png', OC_Helper::getFileNameMimeType('foo.bar.png'));
+		$this->assertEquals('application/octet-stream', OC_Helper::getFileNameMimeType('.png'));
+		$this->assertEquals('application/octet-stream', OC_Helper::getFileNameMimeType('foo'));
+		$this->assertEquals('application/octet-stream', OC_Helper::getFileNameMimeType(''));
+	}
+
 	function testGetStringMimeType() {
 		$result = OC_Helper::getStringMimeType("/data/data.tar.gz");
 		$expected = 'text/plain; charset=us-ascii';