JpegSegmentData segmentData = new JpegSegmentData();
byte segmentMarker = (byte)12;
byte[] segmentBytes = new byte[] { 1,2,3 };
segmentData.addSegment(segmentMarker, segmentBytes);
assertTrue(segmentData.containsSegment(segmentMarker));
File tempFile = File.createTempFile("JpegSegmentDataTest", "tmp");
JpegSegmentData.ToFile(tempFile, segmentData);
assertTrue(tempFile.exists());
assertTrue(tempFile.length() > 0);