@Test
public void getCachePrefix()
        throws IOException
{

    assertEquals( "0/09/098f6bcd4621d373cade4e832627b4f6", FileSystemUtils.getCachePrefix( "test" ) );
    assertEquals( "0/07/073402a6e3f1a393222038b31c140998", FileSystemUtils.getCachePrefix( "dir/test" ) );
    assertEquals( "0/04/0412c29576c708cf0155e8de242169b1.jpg", FileSystemUtils.getCachePrefix( "test.jpg" ) );
    assertEquals( "b/ba/bac3ba4acda45d834747e5b3339f0f1c.png", FileSystemUtils.getCachePrefix( "dir/test.png" ) );
    assertEquals( "0/02/021ad58091421abab4be786251454727.jpg", FileSystemUtils.getCachePrefix( "Harry-Green-HampsteadHeath-copy.jpg" ) );
}