diff --git a/t/Storage/Image.t b/t/Storage/Image.t
index aae27dddd..c1292d8e5 100644
--- a/t/Storage/Image.t
+++ b/t/Storage/Image.t
@@ -65,7 +65,7 @@ my $extensionTests = [
 	},
 ];
 
-plan tests => 54 + scalar @{ $extensionTests }; # increment this value for each test you create
+plan tests => 55 + scalar @{ $extensionTests }; # increment this value for each test you create
 
 my $session = WebGUI::Test->session;
 
@@ -210,6 +210,8 @@ is($WebGUI::Test::logger_error, q/Can't find a thumbnail for a file named 'round
 
 is($thumbStore->getThumbnailUrl('square.png'), $thumbStore->getUrl('thumb-square.png'), 'getThumbnailUrl returns the correct url');
 
+is($thumbStore->getThumbnailUrl('file.pdf'), '', '... return empty string for a file that is not an image');
+
 ####################################################
 #
 # adjustMaxImageSize