@Test
  public void altitudeModeWriteTest()
      throws KmlException, IOException, XMLStreamException, ParserConfigurationException,
          SAXException, URISyntaxException {
    final KmlFactory kmlFactory = DefaultKmlFactory.getInstance();

    final Coordinate coordinate0 = kmlFactory.createCoordinate("146.825,12.233,400.0");
    final Coordinate coordinate1 = kmlFactory.createCoordinate("146.820,12.222,400.0");
    final Coordinate coordinate2 = kmlFactory.createCoordinate("146.812,12.212,400.0");
    final Coordinate coordinate3 = kmlFactory.createCoordinate("146.796,12.209,400.0");
    final Coordinate coordinate4 = kmlFactory.createCoordinate("146.788,12.205,400.0");

    final CoordinateSequence coordinates =
        kmlFactory.createCoordinates(
            Arrays.asList(coordinate0, coordinate1, coordinate2, coordinate3, coordinate4));

    final LineString lineString = kmlFactory.createLineString(coordinates);
    lineString.setAltitudeMode(EnumAltitudeMode.RELATIVE_TO_SEA_FLOOR);
    lineString.setExtrude(true);

    final LookAt lookAt = kmlFactory.createLookAt();
    lookAt.setLongitude(146.806);
    lookAt.setLatitude(12.219);
    lookAt.setHeading(-60);
    lookAt.setTilt(70);
    lookAt.setRange(6300);
    lookAt.setAltitudeMode(EnumAltitudeMode.RELATIVE_TO_SEA_FLOOR);

    final Feature placemark = kmlFactory.createPlacemark();
    placemark.setPropertyValue(KmlConstants.TAG_NAME, "gx:altitudeMode Example");
    placemark.setPropertyValue(KmlConstants.TAG_VIEW, lookAt);
    placemark.setPropertyValue(KmlConstants.TAG_GEOMETRY, lineString);

    final Kml kml = kmlFactory.createKml(null, placemark, null, null);
    kml.addExtensionUri(GxConstants.URI_GX, "gx");

    final File temp = File.createTempFile("testAltitudeMode", ".kml");
    temp.deleteOnExit();

    final KmlWriter writer = new KmlWriter();
    final GxWriter gxWriter = new GxWriter(writer);
    writer.setOutput(temp);
    writer.addExtensionWriter(GxConstants.URI_GX, gxWriter);
    writer.write(kml);
    writer.dispose();

    DomCompare.compare(new File(pathToTestFile), temp);
  }
  @Test
  public void lineStringWriteTest()
      throws KmlException, IOException, XMLStreamException, ParserConfigurationException,
          SAXException {
    final KmlFactory kmlFactory = DefaultKmlFactory.getInstance();

    final Coordinate coordinate00 = kmlFactory.createCoordinate(-122.364383, 37.824664, 0.0);
    final Coordinate coordinate01 = kmlFactory.createCoordinate(-122.364152, 37.824322, 0.0);
    final Coordinate coordinate10 = kmlFactory.createCoordinate(-122.364167, 37.824787, 50.0);
    final Coordinate coordinate11 = kmlFactory.createCoordinate(-122.363917, 37.824423, 50.0);

    final CoordinateSequence coordinates0 =
        kmlFactory.createCoordinates(Arrays.asList(coordinate00, coordinate01));
    final CoordinateSequence coordinates1 =
        kmlFactory.createCoordinates(Arrays.asList(coordinate10, coordinate11));

    final LineString lineString0 = kmlFactory.createLineString(coordinates0);
    lineString0.setExtrude(true);
    lineString0.setTessellate(true);

    final LineString lineString1 = kmlFactory.createLineString(coordinates1);
    lineString1.setExtrude(true);
    lineString1.setTessellate(true);
    lineString1.setAltitudeMode(EnumAltitudeMode.RELATIVE_TO_GROUND);

    final Feature placemark0 = kmlFactory.createPlacemark();
    final Collection<Property> placemark0Properties = placemark0.getProperties();
    placemark0Properties.add(FF.createAttribute("unextruded", KmlModelConstants.ATT_NAME, null));
    placemark0Properties.add(
        FF.createAttribute(lineString0, KmlModelConstants.ATT_PLACEMARK_GEOMETRY, null));

    final Feature placemark1 = kmlFactory.createPlacemark();
    final Collection<Property> placemark1Properties = placemark1.getProperties();
    placemark1Properties.add(FF.createAttribute("extruded", KmlModelConstants.ATT_NAME, null));
    placemark1Properties.add(
        FF.createAttribute(lineString1, KmlModelConstants.ATT_PLACEMARK_GEOMETRY, null));

    final LookAt lookAt = kmlFactory.createLookAt();
    lookAt.setLongitude(-122.36415);
    lookAt.setLatitude(37.824553);
    lookAt.setAltitude(1);
    lookAt.setHeading(2);
    lookAt.setTilt(50);
    lookAt.setRange(150);

    final Feature document = kmlFactory.createDocument();
    final Collection<Property> documentProperties = document.getProperties();
    documentProperties.add(FF.createAttribute("LineString.kml", KmlModelConstants.ATT_NAME, null));
    document.getProperty(KmlModelConstants.ATT_OPEN.getName()).setValue(Boolean.TRUE);
    documentProperties.add(FF.createAttribute(lookAt, KmlModelConstants.ATT_VIEW, null));
    documentProperties.add(
        FeatureUtilities.wrapProperty(placemark0, KmlModelConstants.ATT_DOCUMENT_FEATURES));
    documentProperties.add(
        FeatureUtilities.wrapProperty(placemark1, KmlModelConstants.ATT_DOCUMENT_FEATURES));

    final Kml kml = kmlFactory.createKml(null, document, null, null);

    final File temp = File.createTempFile("testLineString", ".kml");
    temp.deleteOnExit();

    final KmlWriter writer = new KmlWriter();
    writer.setOutput(temp);
    writer.write(kml);
    writer.dispose();

    DomCompare.compare(new File(pathToTestFile), temp);
  }