@Test
 public void testExtractMetadata() throws Exception {
   File withExif = new File("Tests/com/drew/metadata/exif/withExif.jpg");
   Metadata metadata = JpegMetadataReader.readMetadata(withExif);
   Assert.assertTrue(metadata.containsDirectory(ExifSubIFDDirectory.class));
   Directory directory = metadata.getOrCreateDirectory(ExifSubIFDDirectory.class);
   Assert.assertEquals("80", directory.getString(ExifSubIFDDirectory.TAG_ISO_EQUIVALENT));
 }